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Shehata E Abdel Raheem

Assiut University, Civil Engineering, Faculty Member

Taibah University, Madinah, Saudi Arabia, Civil Engineering, Faculty Member

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University of California, Santa Barbara

National University of "Kyiv-Mohyla Academy"

Politecnico di Milano

Kansas State University

University of Cagliari

Armando Marques-Guedes

UNL - New University of Lisbon

University of Virginia

Iolanda Craifaleanu

Technical University Of Civil Engineering, Bucharest

Franco Bontempi

Università degli Studi "La Sapienza" di Roma

University of Strathclyde, Glasgow

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Papers by Shehata E Abdel Raheem

2nd Year Civil Engineering final Exam January 2025

Faculty of Engineering - Assiut University, 2025

2nd Year Civil Engineering final Exam January 2025

Comparative Study Between Active AMD and ABS Devices by Using μ-Synthesis Robust Control

Applied Sciences , 2024

The field of civil engineering has witnessed significant development since the emergence of innov... more The field of civil engineering has witnessed significant development since the emergence of innovative control strategies that enhanced the construction of structures, imparting valuable resistance against dynamic loads like wind or earthquakes. Despite numerous articles highlighting
the potential of various control approaches to reduce vibration, their effectiveness in mitigating the dynamic effects on structures under real-world conditions appears limited once implemented. A variety of factors, including practical constraints, the choice of the control system device, the shape of the structure, and the amount of control energy deployed, contribute to this lack of efficiency.
Within this context, the literature primarily addressed the discrepancy between the mathematical model and the actual structure model, commonly referred to as parameter uncertainties, in the controller design process. In other words, logical continuity in this field involves the application of a more adapted control approach, which enhances performance by incorporating more practical aspects in the controller synthesis procedure. These aspects include the dynamics of the control
device, high-frequency neglected modes, and the inherent limitations or constraints of the control equipment. Thus, this study treats two main active control systems, ABS and AMD. While applying an approach known as μ-synthesis, the robust control was retained because of its ability to include all these considerations when they act simultaneously. We used this control to make sure that a three-degree-of-freedom structure responds as little as possible to seismic requests, which are shown
by an uncertain model. We then conducted a comparative study between these two systems, focusing on displacement reduction and control force, while exploring a classic AMD control system at the top of the structure and an ABS control system at the bottom. This approach proved to be a powerful way to deal with the uncertainties affecting the structure and achieve the stability design objectives, given the satisfying simulation results.

Irregularity Effects on the Seismic Performance of L-Shaped Multi-Story Buildings

JES. Journal of engineering sciences, Sep 1, 2016

Past and recent earthquakes events demonstrate that buildings with configuration irregularity are... more Past and recent earthquakes events demonstrate that buildings with configuration irregularity are more vulnerable to earthquake damages. So it's essential to investigate the seismic response of these structures in active seismic zones to reduce the potential seismic damages. The configuration irregularities introduce major challenges in the seismic design of building structures. One such form of irregularity is the presence of re-entrant corners that causes stress concentration due to sudden changes in stiffness and torsion amplification in the buildings; hence causes early collapse. This, the conventional design codes have not recommendations for proper evaluation of these buildings yet. Thus, a constructive research into re-entrant corner irregularity problems is essentially needed greater than ever. The objective of this study is to grasp the seismic behavior of the buildings with irregular plan of L-shape floor plan through the evaluation of the configuration irregularity of reentrant corners effects on measured seismic response demands. The measured responses include inter-story drift; story shear force; overturning moment; torsion moment at the base and along the building height; top floor displacement; and torsional Irregularity Ratio. Three dimensional finite element model of nine stories moment resisting frame buildings as reference model is developed; six L-shaped models are formulated with gradual reduction in the plan of the reference model. The models are analyzed with ETABS using Equivalent Static Load (ESL) and Response Spectrum (RS) Methods. The results prove that buildings with severe irregularity are more vulnerable than those with regular configuration resulting from torsion behavior, and the additional shear force produced in the perpendicular direction to the earthquake input. Also, in the codal empirical equation for the calculation of fundamental period of vibration could not grasp significant higher vibration modes such as torsional vibration of irregular buildings that could significantly affect seismic demands.

Numerical analysis for structure-pile-fluid-soil interaction model of fixed offshore platform

Ocean systems engineering, Sep 1, 2020

In-place analysis for offshore platforms is required to make proper design for new structures and... more In-place analysis for offshore platforms is required to make proper design for new structures and true assessment for existing structures. In addition, ensure the structural integrity of platforms components under the maximum and minimum operating loads and environmental conditions. In-place analysis was carried out to verify the robustness and capability of structural members with all appurtenances to support the applied loads in either operating condition or storm conditions. A nonlinear finite element analysis is adopted for the platform structure above the seabed and the pile-soil interaction to estimate the in-place behavior of a typical fixed offshore platform. The SACS software is utilized to calculate the natural frequencies of the model and to obtain the response of platform joints according to in-place analysis then the stresses at selected members, as well as their nodal displacements. The directions of environmental loads and water depth variations have an important effect on the results of the in-place analysis behavior. The influence of the soilstructure interaction on the response of the jacket foundation predicts is necessary to estimate the loads of the offshore platform well and real simulation of offshore foundation for the in-place analysis. The result of the study shows that the in-place response investigation is quite crucial for safe design and operation of offshore platform against the variation of environmental loads.

Tower nonlinear dynamic response of cable-stayed bridges under great earthquake ground motion

Seismic pounding between adjacent buildingsconsidering soil-structure interaction

Earthquakes and Structures, 2021

In urban cities, buildings were built in the neighborhood, these buildings influence each other t... more In urban cities, buildings were built in the neighborhood, these buildings influence each other through structure-soil-structure interaction (SSSI) and seismic pounding due to limited separation distance in-between. Generally, the effects of the interaction between soil and structure are disregarded during seismic design and analysis of superstructure. However, the system of soil-base adversely changes structural behavior and response demands. Thus, the vibration characteristics plus the seismic response of a building are not able to be independent of those in adjacent buildings. The interaction between structure, soil, and structure investigates the action of the attendance of adjacent buildings to the others by the interaction effect of the sub-soil under dynamic disturbances. The main purpose of this research is to analyze the effects of SSSI and seismic pounding on the behavior of adjacent buildings. The response of a single structure or two adjacent structures with shallow raft...

Soil Structure Interaction Effect on Seismic Response of Cable-Stayed Bridges Tower

In-place analysis for pile structural response of fixed jacket offshore platform

Ships and Offshore Structures

Effects of numerical modeling simplification on seismic design of buildings

Coupled Systems Mechanics, Dec 1, 2018

The recent seismic events have led to concerns on safety and vulnerability of Reinforced Concrete... more The recent seismic events have led to concerns on safety and vulnerability of Reinforced Concrete Moment Resisting Frame "RC-MRF" buildings. The seismic design demands are greatly dependent on the computational tools, the inherent assumptions and approximations introduced in the modeling process. Thus, it is essential to assess the relative importance of implementing different modeling approaches and investigate the computed response sensitivity to the corresponding modeling assumptions. Many parameters and assumptions are to be justified for generation effective and accurate structural models of RC-MRF buildings to simulate the lateral response and evaluate seismic design demands. So, the present study aims to develop reliable finite element model through many refinements in modeling the various structural components. The effect of finite element modeling assumptions, analysis methods and code provisions on seismic response demands for the structural design of RC-MRF buildings are investigated. where, a series of three-dimensional finite element models were created to study various approaches to quantitatively improve the accuracy of FE models of symmetric buildings located in active seismic zones. It is shown from results of the comparative analyses that the use of a calibrated frame model which was made up of line elements featuring rigid offsets manages to provide estimates that match best with estimates obtained from a much more rigorous modeling approach involving the use of shell elements.

Seismic pounding effects on adjacent buildings in series with different alignment configurations

Steel and Composite Structures, 2018

Soil–structure interaction for seismic analysis and design of bridges

Innovative Bridge Design Handbook, 2022

Dynamic Analysis of Cable-Stayed Bridge Tower Under Levelii Earthquake Ground Motion

The dynamic analysis of cable-stayed bridges in seismically active regions is potentially importa... more The dynamic analysis of cable-stayed bridges in seismically active regions is potentially important to highway facilities design. A quite general nonlinear dynamic analysis is developed for a realistic prediction of tower seismic performance of cable-stayed bridges. One of the most important decisions in carrying out proper analysis is to select a design earthquake that adequately represents the ground motion expected at certain site and in particular the motion that would drive the bridge structure to its critical response. So an extensive series of seismic response analyses using a wide range of ground motions are carried out. The ductility demands and base shear demands due to near-fault and long duration ground motions are compared. The stipulation of code standard input excitation limitations and the present calculated demands are discussed.

Structural control of cable-stayed bridges under traveling earthquake wave excitation

Coupled Systems Mechanics, Jun 1, 2018

Post-earthquake damages investigation in past and recent earthquakes has illustrated that the gro... more Post-earthquake damages investigation in past and recent earthquakes has illustrated that the ground motion spatial variation plays an important role in the structural response of long span bridges. For the structural control of seismic-induced vibrations of cable-stayed bridges, it is extremely important to include the effects of the ground motion spatial variation in the analysis for design of an effective control system. The feasibility and efficiency of different vibration control strategies for the cable-stayed bridge under multiple support excitations have been examined to enhance a structure's ability to withstand earthquake excitations. Comparison of the response due to non-uniform input ground motion with that due to uniform input demonstrates the importance of accounting for spatial variability of excitations. The performance of the optimized designed control systems for uniform input excitations gets worse dramatically over almost all of the evaluation criteria under multiple-support excitations.

Evaluation of Seismic Performance of Multistory Buildings Designed According to Egyptian Code

JES. Journal of Engineering Sciences, 2010

The seismic response of building structures can be estimated by several analysis methods. Each ap... more The seismic response of building structures can be estimated by several analysis methods. Each approach incorporates different assumptions and varies in complexity of application. The traditional approach is to employ equivalent static analysis methods while current design practice is moving towards an increased emphasis on nonlinear analysis methods. This study examined the seismic performance of multistory buildings designed according to Egyptian code. Nonlinear time history analysis is used for evaluation of equivalent static and response spectra procedures that recommended by Egyptian codes for seismic design of building structures. In this study, a preliminary seismic response analysis of two buildings was performed using three analysis procedures to evaluate the building seismic performance and the difference in global response predicted by the three methods. Moreover, three analysis procedures are evaluated for their ability to predict deformation demands in terms of inter-story drifts and potential failure mechanisms. Three ground motions of earthquake records are used for seismic demands evaluation of these buildings. The results demonstrated that, for the three analysis methods used in this study, different predictions of seismic response occurred. Furthermore, the results of the analyses are used to evaluate the advantages, limitations, and ease of application of each approach for seismic analysis. Each method is shown to have merits and deficiencies that should be considered when selecting a seismic analysis method for a particular building structure.

大地震時における鋼斜張橋タワーの免震効果について

Evaluation and mitigation of earthquake induced pounding effects on adjacent buildings performance

Investigations of past and recent earthquake damage have illustrated that the building structures... more Investigations of past and recent earthquake damage have illustrated that the building structures are vulnerable to severe damage and/or collapse during moderate to strong ground motion. Among the possible structural damages, seismic induced pounding has been commonly observed in several earthquakes. A parametric study on buildings pounding response as well as proper seismic hazard mitigation practice for adjacent buildings is carried out. Three categories of recorded earthquake excitation are used for input. The effect of impact is studied using linear and nonlinear contact force model for different separation distances and compared with nominal model without pounding consideration. Pounding produces acceleration and shear at various story levels that are greater than those obtained from the no pounding case, while the peak drift depends on the input excitation characteristics. Also, increasing gap width is likely to be effective when the separation is sufficiently wide practically to eliminate contact. It is effective to provide a shock absorber for the mitigation of impact effects between adjacent buildings with relatively narrow seismic gaps. The sudden changes of stiffness during poundings can be smoothed by using a natural rubber shock absorber, which prevents, to some extent, the acceleration peaks due to impact. The pounding forces exerted on the adjacent buildings can be satisfactorily reduced.

Pages from 978-3-639-20223-6

CE-2nd Year Stress analysis exam Prof. Shehata E Abdel Raheem &Dr Mahmoud H Mansour

Assiut University, 2023

2nd Year Civil Engineering level Structural Analysis on Stress analysis exam Prof. Shehata E Abd... more

MDPI Special Issue "Structural Analysis and Seismic Resilience in Civil Engineering"

https://www.mdpi.com/journal/applsci/special_issues/N352724QG1 Structural analysis and seismic r... more https://www.mdpi.com/journal/applsci/special_issues/N352724QG1

Structural analysis and seismic resilience in civil engineering have paid significant attention to the dynamics of engineering facilities and their social and economic functions, including essential functions of buildings and infrastructures. Modern society requires that structures exhibit higher levels of resilience, especially under earthquakes. The measure of resilience can adequately reflect a city’s capacity to withstand disasters. Quantitative results of seismic resilience assessments in the pre-earthquake environment can further support emergency response planning and seismic retrofits strategies. Thus, the seismic resilience of civil structures is gaining increasing interest as a special approach that goes beyond design codes. Resilience is the ability to absorb or avoid damage without experiencing complete failure, and should be the goal of design, maintenance and restoration of buildings and infrastructures. Mitigating structural damage to infrastructure under such seismic motions remains a major challenge. The continuous development of new materials, novel analysis techniques, design concepts, and numerical analysis tools presents promising advances that could help the research community and designers overcome design and implementation challenges in creating resilient structures.

This Special Issue is focused on recent advances in structural analysis and seismic resilience within civil engineering. We welcome articles that focus on the latest developments in innovative techniques and solutions for structural analysis, seismic resilience, seismic hazard resilient structures, performance-based design, and innovative structural systems for earthquake-resilient buildings. The collection will be of interest to academics and structural and construction engineers but also architects and other professionals involved in the building and construction fields. The submission of original research studies, review papers, and experimental and/or numerical investigations focused on the structural analysis and seismic resilience of buildings and infrastructures is warmly encouraged. Both new projects/applications and interventions on existing structural systems will be of interest for the Special Issue.

Contributions on the following topics are welcome. Potential topics that fall in the scope of the research topic include, but are not limited to, the following:

Advanced composite materials for retrofitting
Analysis of constructional materials under seismic loads
Damage detection and condition assessment
Damage limitation design and life-cycle sustainability
Innovative practices in seismic-resilient structural design
Innovative structural systems for damage minimization and recoverability after earthquakes
Integrated techniques for the seismic retrofitting and strengthening
New structural systems for resilient structures
Performance-based seismic design of structures
Seismic hazard and risk-mitigation measures
Multi-level seismic performance of critical infrastructures under design-basis earthquakes and maximum-credible earthquakes
Seismic resilience assessment
Seismic safety assessment and retrofit of existing structures
Seismic vulnerability assessment of structures
Structural health monitoring
Structural vibration control
Vibration analysis and dynamic characterization

Prof. Dr. Shehata E. Abdel Raheem
Prof. Dr. Humberto Varum
Dr. Dario De Domenico
Guest Editors

Stress analysis exams Prof. Shehata E Abdel Raheem

Exams: Stress analysis exams for 2nd year Civil Engineering

2nd Year Civil Engineering final Exam January 2025

Faculty of Engineering - Assiut University, 2025

2nd Year Civil Engineering final Exam January 2025

Comparative Study Between Active AMD and ABS Devices by Using μ-Synthesis Robust Control

Applied Sciences , 2024

The field of civil engineering has witnessed significant development since the emergence of innov... more The field of civil engineering has witnessed significant development since the emergence of innovative control strategies that enhanced the construction of structures, imparting valuable resistance against dynamic loads like wind or earthquakes. Despite numerous articles highlighting
the potential of various control approaches to reduce vibration, their effectiveness in mitigating the dynamic effects on structures under real-world conditions appears limited once implemented. A variety of factors, including practical constraints, the choice of the control system device, the shape of the structure, and the amount of control energy deployed, contribute to this lack of efficiency.
Within this context, the literature primarily addressed the discrepancy between the mathematical model and the actual structure model, commonly referred to as parameter uncertainties, in the controller design process. In other words, logical continuity in this field involves the application of a more adapted control approach, which enhances performance by incorporating more practical aspects in the controller synthesis procedure. These aspects include the dynamics of the control
device, high-frequency neglected modes, and the inherent limitations or constraints of the control equipment. Thus, this study treats two main active control systems, ABS and AMD. While applying an approach known as μ-synthesis, the robust control was retained because of its ability to include all these considerations when they act simultaneously. We used this control to make sure that a three-degree-of-freedom structure responds as little as possible to seismic requests, which are shown
by an uncertain model. We then conducted a comparative study between these two systems, focusing on displacement reduction and control force, while exploring a classic AMD control system at the top of the structure and an ABS control system at the bottom. This approach proved to be a powerful way to deal with the uncertainties affecting the structure and achieve the stability design objectives, given the satisfying simulation results.

Irregularity Effects on the Seismic Performance of L-Shaped Multi-Story Buildings

JES. Journal of engineering sciences, Sep 1, 2016

Past and recent earthquakes events demonstrate that buildings with configuration irregularity are... more Past and recent earthquakes events demonstrate that buildings with configuration irregularity are more vulnerable to earthquake damages. So it's essential to investigate the seismic response of these structures in active seismic zones to reduce the potential seismic damages. The configuration irregularities introduce major challenges in the seismic design of building structures. One such form of irregularity is the presence of re-entrant corners that causes stress concentration due to sudden changes in stiffness and torsion amplification in the buildings; hence causes early collapse. This, the conventional design codes have not recommendations for proper evaluation of these buildings yet. Thus, a constructive research into re-entrant corner irregularity problems is essentially needed greater than ever. The objective of this study is to grasp the seismic behavior of the buildings with irregular plan of L-shape floor plan through the evaluation of the configuration irregularity of reentrant corners effects on measured seismic response demands. The measured responses include inter-story drift; story shear force; overturning moment; torsion moment at the base and along the building height; top floor displacement; and torsional Irregularity Ratio. Three dimensional finite element model of nine stories moment resisting frame buildings as reference model is developed; six L-shaped models are formulated with gradual reduction in the plan of the reference model. The models are analyzed with ETABS using Equivalent Static Load (ESL) and Response Spectrum (RS) Methods. The results prove that buildings with severe irregularity are more vulnerable than those with regular configuration resulting from torsion behavior, and the additional shear force produced in the perpendicular direction to the earthquake input. Also, in the codal empirical equation for the calculation of fundamental period of vibration could not grasp significant higher vibration modes such as torsional vibration of irregular buildings that could significantly affect seismic demands.

Numerical analysis for structure-pile-fluid-soil interaction model of fixed offshore platform

Ocean systems engineering, Sep 1, 2020

In-place analysis for offshore platforms is required to make proper design for new structures and... more In-place analysis for offshore platforms is required to make proper design for new structures and true assessment for existing structures. In addition, ensure the structural integrity of platforms components under the maximum and minimum operating loads and environmental conditions. In-place analysis was carried out to verify the robustness and capability of structural members with all appurtenances to support the applied loads in either operating condition or storm conditions. A nonlinear finite element analysis is adopted for the platform structure above the seabed and the pile-soil interaction to estimate the in-place behavior of a typical fixed offshore platform. The SACS software is utilized to calculate the natural frequencies of the model and to obtain the response of platform joints according to in-place analysis then the stresses at selected members, as well as their nodal displacements. The directions of environmental loads and water depth variations have an important effect on the results of the in-place analysis behavior. The influence of the soilstructure interaction on the response of the jacket foundation predicts is necessary to estimate the loads of the offshore platform well and real simulation of offshore foundation for the in-place analysis. The result of the study shows that the in-place response investigation is quite crucial for safe design and operation of offshore platform against the variation of environmental loads.

Tower nonlinear dynamic response of cable-stayed bridges under great earthquake ground motion

Seismic pounding between adjacent buildingsconsidering soil-structure interaction

Earthquakes and Structures, 2021

In urban cities, buildings were built in the neighborhood, these buildings influence each other t... more In urban cities, buildings were built in the neighborhood, these buildings influence each other through structure-soil-structure interaction (SSSI) and seismic pounding due to limited separation distance in-between. Generally, the effects of the interaction between soil and structure are disregarded during seismic design and analysis of superstructure. However, the system of soil-base adversely changes structural behavior and response demands. Thus, the vibration characteristics plus the seismic response of a building are not able to be independent of those in adjacent buildings. The interaction between structure, soil, and structure investigates the action of the attendance of adjacent buildings to the others by the interaction effect of the sub-soil under dynamic disturbances. The main purpose of this research is to analyze the effects of SSSI and seismic pounding on the behavior of adjacent buildings. The response of a single structure or two adjacent structures with shallow raft...

Soil Structure Interaction Effect on Seismic Response of Cable-Stayed Bridges Tower

In-place analysis for pile structural response of fixed jacket offshore platform

Ships and Offshore Structures

Effects of numerical modeling simplification on seismic design of buildings

Coupled Systems Mechanics, Dec 1, 2018

The recent seismic events have led to concerns on safety and vulnerability of Reinforced Concrete... more The recent seismic events have led to concerns on safety and vulnerability of Reinforced Concrete Moment Resisting Frame "RC-MRF" buildings. The seismic design demands are greatly dependent on the computational tools, the inherent assumptions and approximations introduced in the modeling process. Thus, it is essential to assess the relative importance of implementing different modeling approaches and investigate the computed response sensitivity to the corresponding modeling assumptions. Many parameters and assumptions are to be justified for generation effective and accurate structural models of RC-MRF buildings to simulate the lateral response and evaluate seismic design demands. So, the present study aims to develop reliable finite element model through many refinements in modeling the various structural components. The effect of finite element modeling assumptions, analysis methods and code provisions on seismic response demands for the structural design of RC-MRF buildings are investigated. where, a series of three-dimensional finite element models were created to study various approaches to quantitatively improve the accuracy of FE models of symmetric buildings located in active seismic zones. It is shown from results of the comparative analyses that the use of a calibrated frame model which was made up of line elements featuring rigid offsets manages to provide estimates that match best with estimates obtained from a much more rigorous modeling approach involving the use of shell elements.

Seismic pounding effects on adjacent buildings in series with different alignment configurations

Steel and Composite Structures, 2018

Soil–structure interaction for seismic analysis and design of bridges

Innovative Bridge Design Handbook, 2022

Dynamic Analysis of Cable-Stayed Bridge Tower Under Levelii Earthquake Ground Motion

The dynamic analysis of cable-stayed bridges in seismically active regions is potentially importa... more The dynamic analysis of cable-stayed bridges in seismically active regions is potentially important to highway facilities design. A quite general nonlinear dynamic analysis is developed for a realistic prediction of tower seismic performance of cable-stayed bridges. One of the most important decisions in carrying out proper analysis is to select a design earthquake that adequately represents the ground motion expected at certain site and in particular the motion that would drive the bridge structure to its critical response. So an extensive series of seismic response analyses using a wide range of ground motions are carried out. The ductility demands and base shear demands due to near-fault and long duration ground motions are compared. The stipulation of code standard input excitation limitations and the present calculated demands are discussed.

Structural control of cable-stayed bridges under traveling earthquake wave excitation

Coupled Systems Mechanics, Jun 1, 2018

Post-earthquake damages investigation in past and recent earthquakes has illustrated that the gro... more Post-earthquake damages investigation in past and recent earthquakes has illustrated that the ground motion spatial variation plays an important role in the structural response of long span bridges. For the structural control of seismic-induced vibrations of cable-stayed bridges, it is extremely important to include the effects of the ground motion spatial variation in the analysis for design of an effective control system. The feasibility and efficiency of different vibration control strategies for the cable-stayed bridge under multiple support excitations have been examined to enhance a structure's ability to withstand earthquake excitations. Comparison of the response due to non-uniform input ground motion with that due to uniform input demonstrates the importance of accounting for spatial variability of excitations. The performance of the optimized designed control systems for uniform input excitations gets worse dramatically over almost all of the evaluation criteria under multiple-support excitations.

Evaluation of Seismic Performance of Multistory Buildings Designed According to Egyptian Code

JES. Journal of Engineering Sciences, 2010

The seismic response of building structures can be estimated by several analysis methods. Each ap... more The seismic response of building structures can be estimated by several analysis methods. Each approach incorporates different assumptions and varies in complexity of application. The traditional approach is to employ equivalent static analysis methods while current design practice is moving towards an increased emphasis on nonlinear analysis methods. This study examined the seismic performance of multistory buildings designed according to Egyptian code. Nonlinear time history analysis is used for evaluation of equivalent static and response spectra procedures that recommended by Egyptian codes for seismic design of building structures. In this study, a preliminary seismic response analysis of two buildings was performed using three analysis procedures to evaluate the building seismic performance and the difference in global response predicted by the three methods. Moreover, three analysis procedures are evaluated for their ability to predict deformation demands in terms of inter-story drifts and potential failure mechanisms. Three ground motions of earthquake records are used for seismic demands evaluation of these buildings. The results demonstrated that, for the three analysis methods used in this study, different predictions of seismic response occurred. Furthermore, the results of the analyses are used to evaluate the advantages, limitations, and ease of application of each approach for seismic analysis. Each method is shown to have merits and deficiencies that should be considered when selecting a seismic analysis method for a particular building structure.

大地震時における鋼斜張橋タワーの免震効果について

Evaluation and mitigation of earthquake induced pounding effects on adjacent buildings performance

Investigations of past and recent earthquake damage have illustrated that the building structures... more Investigations of past and recent earthquake damage have illustrated that the building structures are vulnerable to severe damage and/or collapse during moderate to strong ground motion. Among the possible structural damages, seismic induced pounding has been commonly observed in several earthquakes. A parametric study on buildings pounding response as well as proper seismic hazard mitigation practice for adjacent buildings is carried out. Three categories of recorded earthquake excitation are used for input. The effect of impact is studied using linear and nonlinear contact force model for different separation distances and compared with nominal model without pounding consideration. Pounding produces acceleration and shear at various story levels that are greater than those obtained from the no pounding case, while the peak drift depends on the input excitation characteristics. Also, increasing gap width is likely to be effective when the separation is sufficiently wide practically to eliminate contact. It is effective to provide a shock absorber for the mitigation of impact effects between adjacent buildings with relatively narrow seismic gaps. The sudden changes of stiffness during poundings can be smoothed by using a natural rubber shock absorber, which prevents, to some extent, the acceleration peaks due to impact. The pounding forces exerted on the adjacent buildings can be satisfactorily reduced.

Pages from 978-3-639-20223-6

CE-2nd Year Stress analysis exam Prof. Shehata E Abdel Raheem &Dr Mahmoud H Mansour

Assiut University, 2023

2nd Year Civil Engineering level Structural Analysis on Stress analysis exam Prof. Shehata E Abd... more

MDPI Special Issue "Structural Analysis and Seismic Resilience in Civil Engineering"

https://www.mdpi.com/journal/applsci/special_issues/N352724QG1 Structural analysis and seismic r... more https://www.mdpi.com/journal/applsci/special_issues/N352724QG1

Structural analysis and seismic resilience in civil engineering have paid significant attention to the dynamics of engineering facilities and their social and economic functions, including essential functions of buildings and infrastructures. Modern society requires that structures exhibit higher levels of resilience, especially under earthquakes. The measure of resilience can adequately reflect a city’s capacity to withstand disasters. Quantitative results of seismic resilience assessments in the pre-earthquake environment can further support emergency response planning and seismic retrofits strategies. Thus, the seismic resilience of civil structures is gaining increasing interest as a special approach that goes beyond design codes. Resilience is the ability to absorb or avoid damage without experiencing complete failure, and should be the goal of design, maintenance and restoration of buildings and infrastructures. Mitigating structural damage to infrastructure under such seismic motions remains a major challenge. The continuous development of new materials, novel analysis techniques, design concepts, and numerical analysis tools presents promising advances that could help the research community and designers overcome design and implementation challenges in creating resilient structures.

This Special Issue is focused on recent advances in structural analysis and seismic resilience within civil engineering. We welcome articles that focus on the latest developments in innovative techniques and solutions for structural analysis, seismic resilience, seismic hazard resilient structures, performance-based design, and innovative structural systems for earthquake-resilient buildings. The collection will be of interest to academics and structural and construction engineers but also architects and other professionals involved in the building and construction fields. The submission of original research studies, review papers, and experimental and/or numerical investigations focused on the structural analysis and seismic resilience of buildings and infrastructures is warmly encouraged. Both new projects/applications and interventions on existing structural systems will be of interest for the Special Issue.

Contributions on the following topics are welcome. Potential topics that fall in the scope of the research topic include, but are not limited to, the following:

Advanced composite materials for retrofitting
Analysis of constructional materials under seismic loads
Damage detection and condition assessment
Damage limitation design and life-cycle sustainability
Innovative practices in seismic-resilient structural design
Innovative structural systems for damage minimization and recoverability after earthquakes
Integrated techniques for the seismic retrofitting and strengthening
New structural systems for resilient structures
Performance-based seismic design of structures
Seismic hazard and risk-mitigation measures
Multi-level seismic performance of critical infrastructures under design-basis earthquakes and maximum-credible earthquakes
Seismic resilience assessment
Seismic safety assessment and retrofit of existing structures
Seismic vulnerability assessment of structures
Structural health monitoring
Structural vibration control
Vibration analysis and dynamic characterization

Prof. Dr. Shehata E. Abdel Raheem
Prof. Dr. Humberto Varum
Dr. Dario De Domenico
Guest Editors

Stress analysis exams Prof. Shehata E Abdel Raheem

Exams: Stress analysis exams for 2nd year Civil Engineering

DAMAGE DETECTION AND CONDITION ASSESSMENT OF CIVIL ENGINEERING STRUCTURES USING STRUCTURAL HEALTH MONITORING USING STRUCTURAL HEALTH MONITORING: A REVIEW

Innovative Bridge Design Handbook 2nd Edition

Publisher: Butterworth-Heinemann, 2022

Ch 009: Soil–structure interaction for seismic analysis and design of bridges

EGYPTIAN SPECIFICATION FOR BLAST RESISTANT BUILDINGS SPEC905

EGYPTIAN SPECIFICATION FOR BLAST RESISTANT BUILDINGS SPEC905 2016 edition

Structural Analysis - 2nd year Civil Engineering - mid-term Exam 2021 model answer

Structural Analysis - 2nd year Civil Engineering - mid-term Exam 2021 model answer

Structural Analysis - 2nd year Civil Engineering - Exam 2020 model answer

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