Zenodo (CERN European Organization for Nuclear Research), Mar 16, 2023
These days, the most popular method for enhancing the flexural, shear and torsional properties of... more These days, the most popular method for enhancing the flexural, shear and torsional properties of concrete is steel fiber reinforced concrete (SFRC). This study examines the torsional behavior of steel-fiber reinforced concrete beams in pure torsion. Fiber ratio, fiber type and concrete strength were factors in this study. To cast the tested beams, six different concrete mixtures were chosen. The first group (1) consists of three rectangular beams split into a control beam with a compressive strength of 20 MPa and two rectangular beams with various steel fiber ratios and types. The second group (2) is made up of three beams, with one rectangular beam serving as a control beam with a compressive strength of 40 MPa and the other two rectangular beams having various steel fiber ratios and types. All beams were cast and put through a strict torsion test. The objective of research is to study the crack pattern, crack torque, ultimate torque, torsion rigidity. The experimental study found that adding steel fibers to RC beams improved the ultimate torsion strength and decreased the angle of twist for beams when compared to control beams at the same load.
Journal of Civil Engineering and Management, Jun 22, 2022
Seismic design codes predominantly assume that earthquakes involve a single ground shaking event;... more Seismic design codes predominantly assume that earthquakes involve a single ground shaking event; however, earthquakes can occur as a series of shocks. Consequently, the capacity of structures to resist earthquakes with multiple peaks without suffering severe damage is a crucial parameter. This research study evaluates the seismic performance of a high-rise building in Dubai using existing records of single and multiple peaks. Three-dimensional building model was developed considering the actual cross-sections of the horizontal and vertical elements fitting the seismic zone through dynamic response spectrum analysis. The building is analyzed using the nonlinear regime employing fast-nonlinear timehistory analysis with the scaled NS and EW records of the Niigata earthquake. The main finding of this work is that records with multiple peaks significantly increase structural response and magnify the structural damage compared with records of single-peak earthquakes; thus, earthquakes involving multiple shocks significantly increase the risk of structural failure in a building.
Seismic design codes predominantly assume that earthquakes involve a single ground shaking event;... more Seismic design codes predominantly assume that earthquakes involve a single ground shaking event; however, earthquakes can occur as a series of shocks. Consequently, the capacity of structures to resist earthquakes with multiple peaks without suffering severe damage is a crucial parameter. This research study evaluates the seismic performance of a high-rise building in Dubai using existing records of single and multiple peaks. Three-dimensional building model was developed considering the actual cross-sections of the horizontal and vertical elements fitting the seismic zone through dynamic response spectrum analysis. The building is analyzed using the nonlinear regime employing fast-nonlinear timehistory analysis with the scaled NS and EW records of the Niigata earthquake. The main finding of this work is that records with multiple peaks significantly increase structural response and magnify the structural damage compared with records of single-peak earthquakes; thus, earthquakes in...
The pernicious effect of far-fault and near-fault earthquake records on the seismic behavior of c... more The pernicious effect of far-fault and near-fault earthquake records on the seismic behavior of concrete structures has been studied widely. In addition, several research works have been carried out to investigate the influence of forward-directivity and fling‐step, as unique characteristics of the near-fault motions and not observed in the far-field, on the seismic response and damage of high-rise buildings. This paper focuses on seismic response demand and damage of building structures having different floor systems and subjected to two types of near-fault records with pulses. For this purpose, three-dimensional nonlinear finite element models were developed in ETABS. In addition, fourteen earthquake motions, with characteristics representing forward-directivity and fling-step, are selected to excite the developed models using nonlinear time-history analysis. Two damage models are employed in the study to capture the damage indices associated with each type of slab and earthquake....
This research study investigates the change in dynamic characteristics of reinforced concrete mom... more This research study investigates the change in dynamic characteristics of reinforced concrete moment-resisting frame buildings without and with fully infill walls. In addition, building models with partially infill walls have also been investigated. A set of different building models have been developed to perform the analysis as (1) bare frame (without infill walls), (2) frame with fully infill walls, (3) frame models with infill panels and soft storey located at base level, 3rd storey level, 6th storey level, 9th storey level, and 12th storey level. The equivalent diagonal strut method has been utilized in order to account for the stiffness and structural action of the masonry infill panels. Dynamic time history, using two ground motion records from near and far-fault regions, has been used to perform the seismic analysis of the considered model configurations. The selected two ground motion records have been scaled to meet the expected peak ground acceleration in Cairo zone. The two ground excitations are applied separately in two orthogonal directions. The structural software package ETABS has been used in developing the building models and performing the simulation analysis. Some selected numerical simulation results in terms of storey shear forces, lateral deflections, interstory drift ratios and overturning moments at each storey level are obtained for all the considered configurations and presented in comparative way. Based on the obtained time-history results, it has been found that the dynamic storey responses for bare frame model significantly differ from the responses obtained for both fully infill and partially infill frame models.
This research study investigates the change in dynamic characteristics of reinforced concrete mom... more This research study investigates the change in dynamic characteristics of reinforced concrete moment-resisting frame buildings without and with fully infill walls. In addition, building models with partially infill walls have also been investigated. A set of different building models have been developed to perform the analysis as (1) bare frame (without infill walls), (2) frame with fully infill walls, (3) frame models with infill panels and soft storey located at base level, 3rd storey level, 6th storey level, 9th storey level, and 12th storey level. The equivalent diagonal strut method has been utilized in order to account for the stiffness and structural action of the masonry infill panels. Dynamic time history, using two ground motion records from near and far-fault regions, has been used to perform the seismic analysis of the considered model configurations. The selected two ground motion records have been scaled to meet the expected peak ground acceleration in Cairo zone. The two ground excitations are applied separately in two orthogonal directions. The structural software package ETABS has been used in developing the building models and performing the simulation analysis. Some selected numerical simulation results in terms of storey shear forces, lateral deflections, interstory drift ratios and overturning moments at each storey level are obtained for all the considered configurations and presented in comparative way. Based on the obtained time-history results, it has been found that the dynamic storey responses for bare frame model significantly differ from the responses obtained for both fully infill and partially infill frame models.
Zenodo (CERN European Organization for Nuclear Research), Mar 16, 2023
These days, the most popular method for enhancing the flexural, shear and torsional properties of... more These days, the most popular method for enhancing the flexural, shear and torsional properties of concrete is steel fiber reinforced concrete (SFRC). This study examines the torsional behavior of steel-fiber reinforced concrete beams in pure torsion. Fiber ratio, fiber type and concrete strength were factors in this study. To cast the tested beams, six different concrete mixtures were chosen. The first group (1) consists of three rectangular beams split into a control beam with a compressive strength of 20 MPa and two rectangular beams with various steel fiber ratios and types. The second group (2) is made up of three beams, with one rectangular beam serving as a control beam with a compressive strength of 40 MPa and the other two rectangular beams having various steel fiber ratios and types. All beams were cast and put through a strict torsion test. The objective of research is to study the crack pattern, crack torque, ultimate torque, torsion rigidity. The experimental study found that adding steel fibers to RC beams improved the ultimate torsion strength and decreased the angle of twist for beams when compared to control beams at the same load.
Journal of Civil Engineering and Management, Jun 22, 2022
Seismic design codes predominantly assume that earthquakes involve a single ground shaking event;... more Seismic design codes predominantly assume that earthquakes involve a single ground shaking event; however, earthquakes can occur as a series of shocks. Consequently, the capacity of structures to resist earthquakes with multiple peaks without suffering severe damage is a crucial parameter. This research study evaluates the seismic performance of a high-rise building in Dubai using existing records of single and multiple peaks. Three-dimensional building model was developed considering the actual cross-sections of the horizontal and vertical elements fitting the seismic zone through dynamic response spectrum analysis. The building is analyzed using the nonlinear regime employing fast-nonlinear timehistory analysis with the scaled NS and EW records of the Niigata earthquake. The main finding of this work is that records with multiple peaks significantly increase structural response and magnify the structural damage compared with records of single-peak earthquakes; thus, earthquakes involving multiple shocks significantly increase the risk of structural failure in a building.
Seismic design codes predominantly assume that earthquakes involve a single ground shaking event;... more Seismic design codes predominantly assume that earthquakes involve a single ground shaking event; however, earthquakes can occur as a series of shocks. Consequently, the capacity of structures to resist earthquakes with multiple peaks without suffering severe damage is a crucial parameter. This research study evaluates the seismic performance of a high-rise building in Dubai using existing records of single and multiple peaks. Three-dimensional building model was developed considering the actual cross-sections of the horizontal and vertical elements fitting the seismic zone through dynamic response spectrum analysis. The building is analyzed using the nonlinear regime employing fast-nonlinear timehistory analysis with the scaled NS and EW records of the Niigata earthquake. The main finding of this work is that records with multiple peaks significantly increase structural response and magnify the structural damage compared with records of single-peak earthquakes; thus, earthquakes in...
The pernicious effect of far-fault and near-fault earthquake records on the seismic behavior of c... more The pernicious effect of far-fault and near-fault earthquake records on the seismic behavior of concrete structures has been studied widely. In addition, several research works have been carried out to investigate the influence of forward-directivity and fling‐step, as unique characteristics of the near-fault motions and not observed in the far-field, on the seismic response and damage of high-rise buildings. This paper focuses on seismic response demand and damage of building structures having different floor systems and subjected to two types of near-fault records with pulses. For this purpose, three-dimensional nonlinear finite element models were developed in ETABS. In addition, fourteen earthquake motions, with characteristics representing forward-directivity and fling-step, are selected to excite the developed models using nonlinear time-history analysis. Two damage models are employed in the study to capture the damage indices associated with each type of slab and earthquake....
This research study investigates the change in dynamic characteristics of reinforced concrete mom... more This research study investigates the change in dynamic characteristics of reinforced concrete moment-resisting frame buildings without and with fully infill walls. In addition, building models with partially infill walls have also been investigated. A set of different building models have been developed to perform the analysis as (1) bare frame (without infill walls), (2) frame with fully infill walls, (3) frame models with infill panels and soft storey located at base level, 3rd storey level, 6th storey level, 9th storey level, and 12th storey level. The equivalent diagonal strut method has been utilized in order to account for the stiffness and structural action of the masonry infill panels. Dynamic time history, using two ground motion records from near and far-fault regions, has been used to perform the seismic analysis of the considered model configurations. The selected two ground motion records have been scaled to meet the expected peak ground acceleration in Cairo zone. The two ground excitations are applied separately in two orthogonal directions. The structural software package ETABS has been used in developing the building models and performing the simulation analysis. Some selected numerical simulation results in terms of storey shear forces, lateral deflections, interstory drift ratios and overturning moments at each storey level are obtained for all the considered configurations and presented in comparative way. Based on the obtained time-history results, it has been found that the dynamic storey responses for bare frame model significantly differ from the responses obtained for both fully infill and partially infill frame models.
This research study investigates the change in dynamic characteristics of reinforced concrete mom... more This research study investigates the change in dynamic characteristics of reinforced concrete moment-resisting frame buildings without and with fully infill walls. In addition, building models with partially infill walls have also been investigated. A set of different building models have been developed to perform the analysis as (1) bare frame (without infill walls), (2) frame with fully infill walls, (3) frame models with infill panels and soft storey located at base level, 3rd storey level, 6th storey level, 9th storey level, and 12th storey level. The equivalent diagonal strut method has been utilized in order to account for the stiffness and structural action of the masonry infill panels. Dynamic time history, using two ground motion records from near and far-fault regions, has been used to perform the seismic analysis of the considered model configurations. The selected two ground motion records have been scaled to meet the expected peak ground acceleration in Cairo zone. The two ground excitations are applied separately in two orthogonal directions. The structural software package ETABS has been used in developing the building models and performing the simulation analysis. Some selected numerical simulation results in terms of storey shear forces, lateral deflections, interstory drift ratios and overturning moments at each storey level are obtained for all the considered configurations and presented in comparative way. Based on the obtained time-history results, it has been found that the dynamic storey responses for bare frame model significantly differ from the responses obtained for both fully infill and partially infill frame models.
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