The paper deals with the experimental and theoretical results of elastic constants of polymer mod... more The paper deals with the experimental and theoretical results of elastic constants of polymer modified high strength concrete with high fibre volume fraction. To evaluate elastic properties of this composite system, compressive and flexural strengths were obtained experimentally. Elastic properties such as modulus of elasticity and Poisson’s ratio are first obtained based on experimental results. Simplified equations based on micromechanics, and solid mechanics theories are utilized for the evaluation of elastic properties of polymer modified randomly oriented short steel fibre reinforced high strength concrete. The micromechanics equations for the modulus of elasticity and the Poisson’s ratio are based on the fibre volume fraction and the elastic moduli of the fibre and polymer modified concrete matrix. The existing empirical equations are also used to obtain elastic constants. These equations are applied in the full range of fiber volume fraction (1% to 10%). The comparison of exp...
Hyperstatic forces develop in an indeterminate structure. These forces result when the imposed de... more Hyperstatic forces develop in an indeterminate structure. These forces result when the imposed deformations due to prestressing are restrained or prevented by the support conditions of the structure. The presence of these secondary moments involves extra work in the analysis and design of statically indeterminate prestressed concrete structures. A parametric study has been presented in this paper where three flat slabs of different aspect ratios have been analysed. Based on the observations of this study further problem has been defined. In this paper, a 3x3 panel flat slab of size 7.2mx5.76m has been selected for the analysis. The ultimate moments due to dead load and live load are balanced totally by cables. Percentage hyperstatic moments developed in comparison to primary moments in all strips are computed. Further balancing of moments to a selected range of 50%, 60 % and 70 % has been made. The compressive stress check of all the models at transfer and service stage has been made.
The remarkable partial collapse of the Ronan point apartment tower in 1968initiatedan intellectua... more The remarkable partial collapse of the Ronan point apartment tower in 1968initiatedan intellectual discussion among the engineering community on the possible ways to design buildings against such catastrophic progressive types of failure. There are, in general, three alternative approaches to designing structures to reduce their susceptibility to disproportionate collapse such as redundancy or alternate load paths, local resistance and interconnection or continuity from these one or more approaches should be used to avoid progressive collapse. For this study, we consider, simple, low rise three-dimensional steel frame is to be prepared using ETABS 2015 software and are designed according to the Indian Standard Codes, for all load combinations. This model is to be an analysis for progressive collapse analysis as per latest GSA guideline 2013. The main objective of this study is to determine and understand the critical locations of columns in three-dimensional steel frames, which will...
Presently, Indian standard codal provisions for finding out the approximate time period of steel ... more Presently, Indian standard codal provisions for finding out the approximate time period of steel structure is not considering the type of the bracing system. Bracing element in structural system plays vital role in structural behavior during earthquake. The pattern of the bracing can extensively modify the global seismic behavior of the framed steel building. In this paper the linear time history analysis is carried out on high rise steel building with different pattern of bracing system for Northridge earthquake. Natural frequencies, fundamental time period, mode shapes, inter story drift and base shear are calculated with different pattern of bracing system. Further optimization study was carried out to decide the suitable type of the bracing pattern by keeping the inter-story drift, total lateral displacement and stress level within permissible limit. Aim of study was to compare the results of seismic analysis of high rise steel building with different pattern of bracing system a...
Journal of The Institution of Engineers (India): Series A, 2017
Ten storied-3 bays reinforced concrete bare frame designed for gravity loads following the guidel... more Ten storied-3 bays reinforced concrete bare frame designed for gravity loads following the guidelines of IS 456 and IS 13920 for ductility is subjected to seismic loads. The seismic demands on this building were calculated by following IS 1893 for response spectra of 5% damping (for hard soil type). Plastic hinges were assigned to the beam and column at both ends to represent the failure mode, when member yields. Non-linear static (pushover) analysis was performed to evaluate the performance of the building in reference to first (ATC 40), second (FEMA 356) and next-generation (FEMA 440) performance based seismic design procedures. Base shear against top displacement curve of structure, known as pushover curve was obtained for two actions of plastic hinge behavior, force-controlled (brittle) and deformation-controlled (ductile) actions. Lateral deformation corresponding to performance point proves the building capability to sustain a certain level of seismic loads. The failure is rep...
International Journal of Modern Trends in Engineering and Research, 2015
AbstractPresent paper considers the temperature distribution in the concrete subjected to transie... more AbstractPresent paper considers the temperature distribution in the concrete subjected to transient thermal loading on the concrete due to boiling water. Concrete when exposed to elevated temperatures during fire or in the spent fuel tanks, the heat causes changes in mechanical properties of concrete such as compressive and flexural strength. The study of temperature distribution in concrete subjected to thermal loading was done using finite element approach. The transient thermal analysis was done on the concrete and the results were matched with the experimental data available. The finite element software ABAQUS ver. 6.12 was used to study the transient thermal analysis of concrete. Thermal properties of concrete were adopted from Eurocode 2. The results of temperature distribution in the concrete obtained from the software coordinate with the experimental results available.
International Journal of Applied Science and Engineering, 2015
Individual components of cold-formed storage rack system are most vulnerable to local and torsion... more Individual components of cold-formed storage rack system are most vulnerable to local and torsional buckling under gravity as well as lateral loads.The capacity-based design of coldformed storage rack system consists of deterministic allocation of strength and ductility in the structural elements and performance evaluation by suitable techniques. Nonlinear time history analysis (NTHA) and nonlinear static pushover analysis (NSPA) are most commonly followed techniques for seismic performance evaluation of any structural systems. Although, NTHA is the most accurate method of seismic demand prediction and performance evaluation, it is computationally heavy and even requires the selection and employment of an appropriate set of ground motions. This paper deals with analytical investigation of efficient configuration of conventional pallet racking system on the basis of seismic performance by using NSPA. This analytical study on conventional pallet racking system subjected to lateral loa...
The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing,... more The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing, construction technologies and relevant standards. CFS has many advantages. However the design of CFS structures is complex because of their thin walled open sections making them vulnerable to torsional-flexural buckling and local buckling. Direct strength method (DSM) is the method available for individual beam and column, with certain limitations. To overcome few such limitations this paper attempts to find some simplified formulae as an extension to DSM for stiffened perforated column and two dimensional frames. Already experimented column sections and frames were used for validation. Finite Element Method is used to analysis the column and frame for its load carrying capacity with various parameters. Based on FEM analysis simplified formulae are proposed as an extension to use of DSM for stiffened perforated columns and two dimensional frames.
In this study, an energy-based damage index (DIE) was introduced and expressed as a simple formul... more In this study, an energy-based damage index (DIE) was introduced and expressed as a simple formula on the basis of the nonlinear response obtained from nonlinear static procedures. The DIE is advantageous because pushover analysis has to be performed only once for the lateral loads obtained from the equivalent static method given in the IS 1893 to represent the degree of damage to the structure under consideration. The DIE was employed to assess the damage sustained by example RC frames representing different structures. To extend DIE to different performance levels defined in the FEMA 356, the damage values were associated with the drift-based damage index. The results indicated that the DIE concurred with drift-based damage criterion, and it is a valuable tool for practical applications.
The behavior of industrial storage racks depends on how the individual components like beam to co... more The behavior of industrial storage racks depends on how the individual components like beam to column connections, column bases and members perform interactively with each other. In this paper, using single bay frames braced with combination of horizontal and diagonal bracing by applying impact load on frames with external load and without external load finding out stresses using ANSYS program. Keywords: ANSYS, Impact load.
The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing,... more The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing, construction technologies and relevant standards. CFS has many advantages. However, the design of CFS structures is complex because of their thin walled open sections making them vulnerable to torsional-flexural buckling and local buckling. Direct strength method (DSM) is the method available for individual beam and column, with certain limitations. To overcome one such limitation this paper attempts to find a formula as an extension to DSM. Already experimented frame was used to validate software model and same frame with different heights was analysed by Finite Element Method and DSM and a formula is obtained as an extension to DSM.
Concrete is a construction material composed of cement, aggregates (fine and coarse aggregates) w... more Concrete is a construction material composed of cement, aggregates (fine and coarse aggregates) water and admixtures. Today many researches are ongoing into the use of Portland cement replacements, using many waste materials like pulverized fly ash (PFA) and ground granulated blast furnace slag (GGBS). Like PFA and GGBS a waste glass powder (GLP) is also used as a binder with partial replacement of cement which take some part of reaction at the time of hydration, also it is act as a filler material. In this study, waste glass powders have been used as replacements to the concrete ingredient i.e. cement and the mechanical properties like compressive strength are measured. Also we were studied the size effect of glass powder on strength of concrete. For checking strength effect of replacement of cement by glass powder, the cement is replaced at 10%, 20% and 30%. For study of size effect of glass powder the powder is divided in to two grades one is glass powder having size less than 90...
1. Applied Mechanics Department, Cusrow Wadia Institute of Technology Pune, Maharashtra, India 2.... more 1. Applied Mechanics Department, Cusrow Wadia Institute of Technology Pune, Maharashtra, India 2. Professor, Structural Engineering Department, Veermata Jijabai Technological Institute, Matunga, Mumbai, India 3. Director, Maharashtra State Board of Technical Education, Bandra (East) Mumbai, India 4. Assistant Professor, Applied Mechanics, Government College of Engineering and Research, Avasari (Kd), Pune, Maharashtra, India Corresponding author: [email protected]
Self compacting concrete consolidates under its own weight and do not requires any external effor... more Self compacting concrete consolidates under its own weight and do not requires any external efforts. As mix composition of self compacting concrete is different than normal vibrated concrete, the characteristics at fresh and hardened state are different. Three mixes of powder type self compacting concrete with variable binder, one mix of viscosity modifying agent type self compacting concrete and one normal vibrated concrete mixes with identical water to binder ratio are studied and compared. At green state, the powder type self compacting concrete with higher binder content found to be more stable. Compressive strength increasing with increases in binder content. Tensile strength enhances with increase in compressive strength while ratio of tensile strength to compressive strength ratio found to be decreasing with increase in compressive strength.
The present study deals with the effects of mineral admixtures, by partial replacement of cement,... more The present study deals with the effects of mineral admixtures, by partial replacement of cement, in terms of improved performance on compressive and flexural strengths and durability of prestressed concrete beams. Experimental work was carried out to investigate the effect of Metakaolin(MK) and Fly ash(FA) by partial replacing cement and using same quantity of water i.e. increasing W/C ratio to OPC+MK and OPC+FA. In this program 90 cube samples of size 150mmx150mmx150mm for different percentages of MK and FA with partial replacement of cement were casted and tested. The concrete mixes had 0%,10%,20%,30% of FA and 0%,5%,10%,15%,20%,25%,30% of MK, replacing cement partially, so as to determine the best proportion, which would give maximum compressive strength(CS). It reveals that with 10% MK and FA each partial replacement of cement were found to be most favorable combinations for casting of prestressed concrete flexural members.Using the optimum mix proportion giving the best result...
The paper deals with the experimental and theoretical results of elastic constants of polymer mod... more The paper deals with the experimental and theoretical results of elastic constants of polymer modified high strength concrete with high fibre volume fraction. To evaluate elastic properties of this composite system, compressive and flexural strengths were obtained experimentally. Elastic properties such as modulus of elasticity and Poisson’s ratio are first obtained based on experimental results. Simplified equations based on micromechanics, and solid mechanics theories are utilized for the evaluation of elastic properties of polymer modified randomly oriented short steel fibre reinforced high strength concrete. The micromechanics equations for the modulus of elasticity and the Poisson’s ratio are based on the fibre volume fraction and the elastic moduli of the fibre and polymer modified concrete matrix. The existing empirical equations are also used to obtain elastic constants. These equations are applied in the full range of fiber volume fraction (1% to 10%). The comparison of exp...
The paper deals with the experimental and theoretical results of elastic constants of polymer mod... more The paper deals with the experimental and theoretical results of elastic constants of polymer modified high strength concrete with high fibre volume fraction. To evaluate elastic properties of this composite system, compressive and flexural strengths were obtained experimentally. Elastic properties such as modulus of elasticity and Poisson’s ratio are first obtained based on experimental results. Simplified equations based on micromechanics, and solid mechanics theories are utilized for the evaluation of elastic properties of polymer modified randomly oriented short steel fibre reinforced high strength concrete. The micromechanics equations for the modulus of elasticity and the Poisson’s ratio are based on the fibre volume fraction and the elastic moduli of the fibre and polymer modified concrete matrix. The existing empirical equations are also used to obtain elastic constants. These equations are applied in the full range of fiber volume fraction (1% to 10%). The comparison of exp...
Hyperstatic forces develop in an indeterminate structure. These forces result when the imposed de... more Hyperstatic forces develop in an indeterminate structure. These forces result when the imposed deformations due to prestressing are restrained or prevented by the support conditions of the structure. The presence of these secondary moments involves extra work in the analysis and design of statically indeterminate prestressed concrete structures. A parametric study has been presented in this paper where three flat slabs of different aspect ratios have been analysed. Based on the observations of this study further problem has been defined. In this paper, a 3x3 panel flat slab of size 7.2mx5.76m has been selected for the analysis. The ultimate moments due to dead load and live load are balanced totally by cables. Percentage hyperstatic moments developed in comparison to primary moments in all strips are computed. Further balancing of moments to a selected range of 50%, 60 % and 70 % has been made. The compressive stress check of all the models at transfer and service stage has been made.
The remarkable partial collapse of the Ronan point apartment tower in 1968initiatedan intellectua... more The remarkable partial collapse of the Ronan point apartment tower in 1968initiatedan intellectual discussion among the engineering community on the possible ways to design buildings against such catastrophic progressive types of failure. There are, in general, three alternative approaches to designing structures to reduce their susceptibility to disproportionate collapse such as redundancy or alternate load paths, local resistance and interconnection or continuity from these one or more approaches should be used to avoid progressive collapse. For this study, we consider, simple, low rise three-dimensional steel frame is to be prepared using ETABS 2015 software and are designed according to the Indian Standard Codes, for all load combinations. This model is to be an analysis for progressive collapse analysis as per latest GSA guideline 2013. The main objective of this study is to determine and understand the critical locations of columns in three-dimensional steel frames, which will...
Presently, Indian standard codal provisions for finding out the approximate time period of steel ... more Presently, Indian standard codal provisions for finding out the approximate time period of steel structure is not considering the type of the bracing system. Bracing element in structural system plays vital role in structural behavior during earthquake. The pattern of the bracing can extensively modify the global seismic behavior of the framed steel building. In this paper the linear time history analysis is carried out on high rise steel building with different pattern of bracing system for Northridge earthquake. Natural frequencies, fundamental time period, mode shapes, inter story drift and base shear are calculated with different pattern of bracing system. Further optimization study was carried out to decide the suitable type of the bracing pattern by keeping the inter-story drift, total lateral displacement and stress level within permissible limit. Aim of study was to compare the results of seismic analysis of high rise steel building with different pattern of bracing system a...
Journal of The Institution of Engineers (India): Series A, 2017
Ten storied-3 bays reinforced concrete bare frame designed for gravity loads following the guidel... more Ten storied-3 bays reinforced concrete bare frame designed for gravity loads following the guidelines of IS 456 and IS 13920 for ductility is subjected to seismic loads. The seismic demands on this building were calculated by following IS 1893 for response spectra of 5% damping (for hard soil type). Plastic hinges were assigned to the beam and column at both ends to represent the failure mode, when member yields. Non-linear static (pushover) analysis was performed to evaluate the performance of the building in reference to first (ATC 40), second (FEMA 356) and next-generation (FEMA 440) performance based seismic design procedures. Base shear against top displacement curve of structure, known as pushover curve was obtained for two actions of plastic hinge behavior, force-controlled (brittle) and deformation-controlled (ductile) actions. Lateral deformation corresponding to performance point proves the building capability to sustain a certain level of seismic loads. The failure is rep...
International Journal of Modern Trends in Engineering and Research, 2015
AbstractPresent paper considers the temperature distribution in the concrete subjected to transie... more AbstractPresent paper considers the temperature distribution in the concrete subjected to transient thermal loading on the concrete due to boiling water. Concrete when exposed to elevated temperatures during fire or in the spent fuel tanks, the heat causes changes in mechanical properties of concrete such as compressive and flexural strength. The study of temperature distribution in concrete subjected to thermal loading was done using finite element approach. The transient thermal analysis was done on the concrete and the results were matched with the experimental data available. The finite element software ABAQUS ver. 6.12 was used to study the transient thermal analysis of concrete. Thermal properties of concrete were adopted from Eurocode 2. The results of temperature distribution in the concrete obtained from the software coordinate with the experimental results available.
International Journal of Applied Science and Engineering, 2015
Individual components of cold-formed storage rack system are most vulnerable to local and torsion... more Individual components of cold-formed storage rack system are most vulnerable to local and torsional buckling under gravity as well as lateral loads.The capacity-based design of coldformed storage rack system consists of deterministic allocation of strength and ductility in the structural elements and performance evaluation by suitable techniques. Nonlinear time history analysis (NTHA) and nonlinear static pushover analysis (NSPA) are most commonly followed techniques for seismic performance evaluation of any structural systems. Although, NTHA is the most accurate method of seismic demand prediction and performance evaluation, it is computationally heavy and even requires the selection and employment of an appropriate set of ground motions. This paper deals with analytical investigation of efficient configuration of conventional pallet racking system on the basis of seismic performance by using NSPA. This analytical study on conventional pallet racking system subjected to lateral loa...
The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing,... more The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing, construction technologies and relevant standards. CFS has many advantages. However the design of CFS structures is complex because of their thin walled open sections making them vulnerable to torsional-flexural buckling and local buckling. Direct strength method (DSM) is the method available for individual beam and column, with certain limitations. To overcome few such limitations this paper attempts to find some simplified formulae as an extension to DSM for stiffened perforated column and two dimensional frames. Already experimented column sections and frames were used for validation. Finite Element Method is used to analysis the column and frame for its load carrying capacity with various parameters. Based on FEM analysis simplified formulae are proposed as an extension to use of DSM for stiffened perforated columns and two dimensional frames.
In this study, an energy-based damage index (DIE) was introduced and expressed as a simple formul... more In this study, an energy-based damage index (DIE) was introduced and expressed as a simple formula on the basis of the nonlinear response obtained from nonlinear static procedures. The DIE is advantageous because pushover analysis has to be performed only once for the lateral loads obtained from the equivalent static method given in the IS 1893 to represent the degree of damage to the structure under consideration. The DIE was employed to assess the damage sustained by example RC frames representing different structures. To extend DIE to different performance levels defined in the FEMA 356, the damage values were associated with the drift-based damage index. The results indicated that the DIE concurred with drift-based damage criterion, and it is a valuable tool for practical applications.
The behavior of industrial storage racks depends on how the individual components like beam to co... more The behavior of industrial storage racks depends on how the individual components like beam to column connections, column bases and members perform interactively with each other. In this paper, using single bay frames braced with combination of horizontal and diagonal bracing by applying impact load on frames with external load and without external load finding out stresses using ANSYS program. Keywords: ANSYS, Impact load.
The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing,... more The use of cold-formed steel (CFS) structures is increasing due to the advances in manufacturing, construction technologies and relevant standards. CFS has many advantages. However, the design of CFS structures is complex because of their thin walled open sections making them vulnerable to torsional-flexural buckling and local buckling. Direct strength method (DSM) is the method available for individual beam and column, with certain limitations. To overcome one such limitation this paper attempts to find a formula as an extension to DSM. Already experimented frame was used to validate software model and same frame with different heights was analysed by Finite Element Method and DSM and a formula is obtained as an extension to DSM.
Concrete is a construction material composed of cement, aggregates (fine and coarse aggregates) w... more Concrete is a construction material composed of cement, aggregates (fine and coarse aggregates) water and admixtures. Today many researches are ongoing into the use of Portland cement replacements, using many waste materials like pulverized fly ash (PFA) and ground granulated blast furnace slag (GGBS). Like PFA and GGBS a waste glass powder (GLP) is also used as a binder with partial replacement of cement which take some part of reaction at the time of hydration, also it is act as a filler material. In this study, waste glass powders have been used as replacements to the concrete ingredient i.e. cement and the mechanical properties like compressive strength are measured. Also we were studied the size effect of glass powder on strength of concrete. For checking strength effect of replacement of cement by glass powder, the cement is replaced at 10%, 20% and 30%. For study of size effect of glass powder the powder is divided in to two grades one is glass powder having size less than 90...
1. Applied Mechanics Department, Cusrow Wadia Institute of Technology Pune, Maharashtra, India 2.... more 1. Applied Mechanics Department, Cusrow Wadia Institute of Technology Pune, Maharashtra, India 2. Professor, Structural Engineering Department, Veermata Jijabai Technological Institute, Matunga, Mumbai, India 3. Director, Maharashtra State Board of Technical Education, Bandra (East) Mumbai, India 4. Assistant Professor, Applied Mechanics, Government College of Engineering and Research, Avasari (Kd), Pune, Maharashtra, India Corresponding author: [email protected]
Self compacting concrete consolidates under its own weight and do not requires any external effor... more Self compacting concrete consolidates under its own weight and do not requires any external efforts. As mix composition of self compacting concrete is different than normal vibrated concrete, the characteristics at fresh and hardened state are different. Three mixes of powder type self compacting concrete with variable binder, one mix of viscosity modifying agent type self compacting concrete and one normal vibrated concrete mixes with identical water to binder ratio are studied and compared. At green state, the powder type self compacting concrete with higher binder content found to be more stable. Compressive strength increasing with increases in binder content. Tensile strength enhances with increase in compressive strength while ratio of tensile strength to compressive strength ratio found to be decreasing with increase in compressive strength.
The present study deals with the effects of mineral admixtures, by partial replacement of cement,... more The present study deals with the effects of mineral admixtures, by partial replacement of cement, in terms of improved performance on compressive and flexural strengths and durability of prestressed concrete beams. Experimental work was carried out to investigate the effect of Metakaolin(MK) and Fly ash(FA) by partial replacing cement and using same quantity of water i.e. increasing W/C ratio to OPC+MK and OPC+FA. In this program 90 cube samples of size 150mmx150mmx150mm for different percentages of MK and FA with partial replacement of cement were casted and tested. The concrete mixes had 0%,10%,20%,30% of FA and 0%,5%,10%,15%,20%,25%,30% of MK, replacing cement partially, so as to determine the best proportion, which would give maximum compressive strength(CS). It reveals that with 10% MK and FA each partial replacement of cement were found to be most favorable combinations for casting of prestressed concrete flexural members.Using the optimum mix proportion giving the best result...
The paper deals with the experimental and theoretical results of elastic constants of polymer mod... more The paper deals with the experimental and theoretical results of elastic constants of polymer modified high strength concrete with high fibre volume fraction. To evaluate elastic properties of this composite system, compressive and flexural strengths were obtained experimentally. Elastic properties such as modulus of elasticity and Poisson’s ratio are first obtained based on experimental results. Simplified equations based on micromechanics, and solid mechanics theories are utilized for the evaluation of elastic properties of polymer modified randomly oriented short steel fibre reinforced high strength concrete. The micromechanics equations for the modulus of elasticity and the Poisson’s ratio are based on the fibre volume fraction and the elastic moduli of the fibre and polymer modified concrete matrix. The existing empirical equations are also used to obtain elastic constants. These equations are applied in the full range of fiber volume fraction (1% to 10%). The comparison of exp...
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