In recent years numerous investigations have been conducted on strengthening of reinforced concre... more In recent years numerous investigations have been conducted on strengthening of reinforced concrete (RC) beams using fiber reinforced polymer (FRP) bars or sheets. However, the studies on the application of varying FRP prestressing are sparse. The present finite element analysis (FEA) study involves flexural strengthening of RC beams with near surface mounted (NSM) pre-stressed carbon fiber reinforced polymers (CFRP). The FEA beam model was first validated using the data from an existing experimental study in the literature. The beam model had a good agreement with the experimental results. Parameters considered were internal steel and external CFRP reinforcement ratios of the RC beams under 0 %, 20%, 30%, and 40% prestressing levels. The finite element results revealed that for all CFRP reinforcement ratios, the 30% pre-stressing level showed significant ultimate load and considerable ductility. The increase in pre-stressing level of CFRP up to 30% resulted in higher load capacity ...
An increase in deliberate and accidental explosions in recent years has prompted an urgent need t... more An increase in deliberate and accidental explosions in recent years has prompted an urgent need to investigate the response and behavior of structures subjected to blast loadings. Many of government structures must be capable of sustaining various loading conditions including the blast load. The present paper entails finite element analysis of multistory frame structures subjected to blast loadings. Nonlinear dynamic analysis was performed due to the large amount of literature supporting it as the superior method of analysis as compared to nonlinear static analysis. The accuracy of the multistory frame model was also confirmed through comparison of its response under blast loading with that of an existing study in the literature, and the results were in good agreement. Retrofitting was simulated by relocating the plastic hinge formations in structural members of the frame. The load factors initiating plastic hinge formation under varying degrees of retrofitting for various frame sha...
Proceedings of International Structural Engineering and Construction, 2019
Fiber reinforced polymer (FRP) strengthening has been widely used for concrete structures. Howeve... more Fiber reinforced polymer (FRP) strengthening has been widely used for concrete structures. However, limited studies have been conducted on its application to steel structures. The use of FRP materials to retrofit steel members is an effective replacement for welded or bolted steel plates and offer high strength-to-weight ratio, resilience to environmental degradation, and a robust fatigue performance. Past studies have shown that the application of FRP to steel is a promising technical solution to help against corrosion and also to increase the load carrying capacity of steel members. In the present study, finite element analysis (FEA) model of a steel beam strengthened with carbon fiber reinforced polymer (CFRP) laminates was developed using ANSYS Mechanical finite element software program. The model was validated by comparing the FEA and experimental results of an existing study in the literature and they were in good agreement. A parametric study was conducted on the validated st...
The behavior of small-scale fiber reinforced polymer (FRP) wrapped concrete cylinders under uniax... more The behavior of small-scale fiber reinforced polymer (FRP) wrapped concrete cylinders under uniaxial compressive loading was investigated through nonlinear finite element analysis. Two parameters were considered for this numerical study: the FRP wrap thickness, and the ply configuration. Performances of numerical models with “hoop-angle-hoop” and “angle-hoop-angle” ply configurations were compared, where the terms “hoop” and “angle” indicate that wraps were
Light wood roof-to-wall connections are vulnerable when subjected to high-speed winds. In lieu of... more Light wood roof-to-wall connections are vulnerable when subjected to high-speed winds. In lieu of traditional metal connections, the present finite element analysis (FEA) study focuses on the use of epoxy and easy-to-apply, noncorrosive FRP ties to connect the roof and the walls in wood frames. The FEA models of the wood roof-to-wall GFRP connection were validated with an experimental study in the literature. Subsequently parametric study was performed on the validated FEA models. Parameters considered were the addition of anchorages to secure the GFRP ties for FEA models of shear and uplift tests, and various FRP types. Wood roof-to-wall connection uplift model was subjected to monotonic cyclic loading to simulate the effect of wind load. In addition, carbon and basalt FRP ties were also examined under monotonic cyclic loading. To evaluate the efficiency of GFRP ties with and without anchorages, the shear and uplift design loads specified in ASCE 7-16 were calculated. Finally, a fo...
In recent years numerous investigations have been conducted on strengthening of reinforced concre... more In recent years numerous investigations have been conducted on strengthening of reinforced concrete (RC) beams using fiber reinforced polymer (FRP) bars or sheets. However, the studies on the application of varying FRP prestressing are sparse. The present finite element analysis (FEA) study involves flexural strengthening of RC beams with near surface mounted (NSM) pre-stressed carbon fiber reinforced polymers (CFRP). The FEA beam model was first validated using the data from an existing experimental study in the literature. The beam model had a good agreement with the experimental results. Parameters considered were internal steel and external CFRP reinforcement ratios of the RC beams under 0 %, 20%, 30%, and 40% prestressing levels. The finite element results revealed that for all CFRP reinforcement ratios, the 30% pre-stressing level showed significant ultimate load and considerable ductility. The increase in pre-stressing level of CFRP up to 30% resulted in higher load capacity ...
An increase in deliberate and accidental explosions in recent years has prompted an urgent need t... more An increase in deliberate and accidental explosions in recent years has prompted an urgent need to investigate the response and behavior of structures subjected to blast loadings. Many of government structures must be capable of sustaining various loading conditions including the blast load. The present paper entails finite element analysis of multistory frame structures subjected to blast loadings. Nonlinear dynamic analysis was performed due to the large amount of literature supporting it as the superior method of analysis as compared to nonlinear static analysis. The accuracy of the multistory frame model was also confirmed through comparison of its response under blast loading with that of an existing study in the literature, and the results were in good agreement. Retrofitting was simulated by relocating the plastic hinge formations in structural members of the frame. The load factors initiating plastic hinge formation under varying degrees of retrofitting for various frame sha...
Proceedings of International Structural Engineering and Construction, 2019
Fiber reinforced polymer (FRP) strengthening has been widely used for concrete structures. Howeve... more Fiber reinforced polymer (FRP) strengthening has been widely used for concrete structures. However, limited studies have been conducted on its application to steel structures. The use of FRP materials to retrofit steel members is an effective replacement for welded or bolted steel plates and offer high strength-to-weight ratio, resilience to environmental degradation, and a robust fatigue performance. Past studies have shown that the application of FRP to steel is a promising technical solution to help against corrosion and also to increase the load carrying capacity of steel members. In the present study, finite element analysis (FEA) model of a steel beam strengthened with carbon fiber reinforced polymer (CFRP) laminates was developed using ANSYS Mechanical finite element software program. The model was validated by comparing the FEA and experimental results of an existing study in the literature and they were in good agreement. A parametric study was conducted on the validated st...
The behavior of small-scale fiber reinforced polymer (FRP) wrapped concrete cylinders under uniax... more The behavior of small-scale fiber reinforced polymer (FRP) wrapped concrete cylinders under uniaxial compressive loading was investigated through nonlinear finite element analysis. Two parameters were considered for this numerical study: the FRP wrap thickness, and the ply configuration. Performances of numerical models with “hoop-angle-hoop” and “angle-hoop-angle” ply configurations were compared, where the terms “hoop” and “angle” indicate that wraps were
Light wood roof-to-wall connections are vulnerable when subjected to high-speed winds. In lieu of... more Light wood roof-to-wall connections are vulnerable when subjected to high-speed winds. In lieu of traditional metal connections, the present finite element analysis (FEA) study focuses on the use of epoxy and easy-to-apply, noncorrosive FRP ties to connect the roof and the walls in wood frames. The FEA models of the wood roof-to-wall GFRP connection were validated with an experimental study in the literature. Subsequently parametric study was performed on the validated FEA models. Parameters considered were the addition of anchorages to secure the GFRP ties for FEA models of shear and uplift tests, and various FRP types. Wood roof-to-wall connection uplift model was subjected to monotonic cyclic loading to simulate the effect of wind load. In addition, carbon and basalt FRP ties were also examined under monotonic cyclic loading. To evaluate the efficiency of GFRP ties with and without anchorages, the shear and uplift design loads specified in ASCE 7-16 were calculated. Finally, a fo...
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Papers by Azadeh Parvin