Improvement and optimization of seismic performance of structural systems is one of the principal methods for decreasing probability damages due to earthquakes. COMPOSITE SHEAR WALL is one of lateral load bearing systems. In this system, compressive strength of concrete and tensile behavior of bars is COMPOSITEd for achievement suitable performance in terms of stabilization and economic performance in usual steel and reinforced concrete structures. In this research, COMPOSITE SHEAR WALL with embedded steel columns in boundary sides is introduced and comprised with normal reinforced SHEAR WALL. In present study, seismic behavior of system under gravitational and lateral loading with assuming nonlinear behavior of material by utilization Abaqus software according to finite element theory analyzed. It should be noted, in analysis process pushover method was applied. According to obtained results can be explained that embedded steel column cause increase bearing capacity and ductility in SHEAR WALL.

Steel plate SHEAR WALLs have been used in structures as a lateral load resisting system since 1970. Main advantage of thin steel plate SHEAR WALL is buckling of steel plate under tension field action. Generally, there are two methods to delay the steel plate buckling, using stiffeners or concrete cover which attached to the steel plate by SHEAR connectors.In the present study, a numerical approach has been used to investigate the SHEAR behavior of COMPOSITE SHEAR WALLs under lateral loading. Furthermore a geometrical optimization analysis was carried out by changing the concrete cover thickness and distance between SHEAR connectors. The results of numerical analysis, show increasing concrete cover thickness will result decreasing stress concentration in steel plate and distributing them. Furthermore the result show that decreasing distance between SHEAR connector will result increasing the strength and stiffness of SHEAR panel. Finally studying the models deformation the optimum concrete cover thickness and distance between SHEAR connectors are proposed.

Steel plate SHEAR WALLs have been used in structures as a lateral load resisting system since 1970. Main advantage of thin steel plate SHEAR WALL is buckling of steel plate under tension field action. Generally, there are two methods to delay the steel plate buckling, using stiffeners or concrete cover which attached to the steel plate by SHEAR connectors.In the present study, a numerical approach has been used to investigate the SHEAR behavior of COMPOSITE SHEAR WALLs under lateral loading. Furthermore a geometrical optimization analysis was carried out by changing the concrete cover thickness and distance between SHEAR connectors. The results of numerical analysis, show increasing concrete cover thickness will result decreasing stress concentration in steel plate and distributing them. Furthermore the result show that decreasing distance between SHEAR connector will result increasing the strength and stiffness of SHEAR panel. Finally studying the models deformation the optimum concrete cover thickness and distance between SHEAR connectors are proposed.

SHEAR WALLs can be designed to have sufficient bearing capacity and deformation and absorb energy due to nonlinear SHEAR-bending and axial load-bending, interactions. However, in the event that reinforced concrete WALLs do not have sufficient seismic resistance, the effective solution is to use new COMPOSITE WALL options. The use of steel trusses, consisting of steel columns and embedded steel brace in the reinforced concrete SHEAR WALL is one of the types of COMPOSITE SHEAR WALLs. In this study, seismic behavior of COMPOSITE SHEAR WALL with embedded steel truss is investigated. For this purpose, various models of these WALLs have been modeled using finite element method at 5, 10 and 15 storys. The influence of various factors such as bracket area, column area, and axial load ratio on the performance of this system against lateral loads is evaluated. The influence of various factors such as brace area, column area, and axial load ratio on the performance of this system against lateral loads is evaluated. The results show the steel braces to increase lateral bearing capacity and column steel has been more effective in absorbing energy. Axial load had a greater effect on increasing the initial hardness. But, to avoid the adverse effects on ductility behavior, the axial load ratio must be limited to the medium level.

The steel SHEAR WALL and COMPOSITE steel plate SHEAR WALL is introduced in recent three decade and is considered and is spread rapidly. COMPOSITE steel plate SHEAR WALL which is made of a layer of thin steel sheet with coating of reinforced concrete in one or both sides of steel palate is considered a third generation of resistance SHEAR WALLs against lateral loads that in addition to increasing the strength, ductility and energy absorption, it is very economical and affordable and it is used in constructing high buildings, retrofitting buildings and tanks. In this paper we have tried to examine the seismic behavior of steel and COMPOSITE SHEAR WALLs. For this purpose several models of steel SHEAR and COMPOSITE WALLs from one to five stories were constructed and analyzed by Abaqus software. The result show that COMPOSITE steel plate SHEAR WALLs has more ability to absorb energy, spread produced stress to different parts of the steel plate and ductile than steel SHEAR WALLs. The curve hysteresis loop of COMPOSITE steel palate SHEAR WALLs is more stable and sustainable than steel SHEAR WALL. With increasing the number of stories, the initial strength and stiffness is decreased due to increase in lateral shift but the amount of absorbing energy and ductility is increased. The force tolerance in COMPOSITE steel plate SHEAR WALL models is increased in comparison with steel SHEAR WALLs.

COMPOSITE Steel plate SHEAR WALLs (C.S.S.W.) have been used in structures as a lateral resisting system that it's building by concrete cover on one or both sides of steel plate. This system that identified as the 3rd version of the SHEAR WALLs, by increasing of stiffness, ductility & energy absorption is widely used in tall building, retrofitting of structures and tanks.In this paper, evaluation of concrete layer to steel plate thickness ratio has been investigated on C.S.S.W. behavior. In this regard, some experimental and analytical specimens involved of flexible steel tram, steel SHEAR WALL & steel plate SHEAR WALL COMPOSITEd with reinforced concrete layer are built and tested using a rigid frame and actuator. The variable parameters on COMPOSITE SHEAR WALL were the number of concrete layer, distance between stuts and ratio of steel plate to of concrete layer thickness. The results show that the stiffness of COMPOSITE SHEAR WALL has direct proportion to concrete layer thickness and has inverse proportion to distance between stuts. Increasing on proportion of thickness of steel plate to thickness of concrete layer until optimum thickness reduced the displacement of out of plate and beyond which there would be no merit. On the other hand, usage of two concrete layers on two side of steel plate was reduced effect of secondary bending.

COMPOSITE couple beams are the concrete elements consisting of longitudinal bars and steel plate, therefore suitable for SHEAR transferring in couple SHEAR WALLs with arranged gates in its height. In this paper, after modeling couple beams with and without steel plates with F.E methods and calibration the models with experimental results, effects of parameters such as thickness, height, length and yielding strength of the steel plates located in concrete couple COMPOSITE beam have been investigated on the ductility, energy dissipation and capacity. The results were illustrated that if the plate thickness would be increased by four times, ductility and energy dissipation capacity were decreased 15.6 and 14.7 percent and also loading capacity was enhanced up to 25 percent, respectively. And also the plate height and length didn’t have influence on above mentioned parameters. Furthermore, by 80 and 280 percent enhancement in yielding plate strength, ductility and energy dissipation capacity were decline 10.8 to 23.9 and 8.9 to 21.7 percent and also 19, 33 percent enhancement in loading capacity was happened.

In recent years, reinforced concrete (RC) SHEAR WALLs have been welcomed by structural designers with regard to their desirable seismic performance in terms of ductility. Most of the time, creating an opening in the RC SHEAR WALL due to architectural issues, which is inevitable, results in reducing the strength, ductility and stiffness of the WALL. For this reason, the issue of retrofitting the RC SHEAR WALLs is developed to solve these weaknesses. In this paper, first, a laboratory sample of the reinforced concrete SHEAR WALL without opening was validated in ABAQUS software. After verification of the sample, the cyclic SHEAR WALL behavior of reinforced concrete with retractable openings with eight different designs horizontally, vertically, diagonally and combined by carbon fiber reinforced sheets (CFRP) in ABAQUS finite element software has been evaluated. For nonlinear static analysis, the specimens were subjected to lateral loading, cycling, and various parameters such as stiffness, displacement, and ductility were examined and compared. The results were presented in the form of capacity (force-displacement) curves, ductility, compressive and tensile failure contours. As the results show, reinforcement of SHEAR WALLs of reinforced concrete with opening increases flexural strength, SHEAR and ductility. The results showed that the RCSW8 sample increased by 12% compared to the reference sample bearing capacity. The hardness of the RCSW8 sample is increased by 15% and the ductility is improved.