Bearing Concrete Wall (BCW) is one of the most applicable structural systems. In this paper, with the aim of evaluating bearing wall performance, nonlinear static analysis based on several assumptions drawing upon experimental research is used. To validate the nonlinear analysis method, the analytical and experimental results are compared. To evaluate the reduction factor and ductility level of BCW systems, a vast study on several models with different stories and several nonlinear analysis are

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... performed. The results indicated that, the components of the boundary element have a limit effect on the models' ductility factor. Also, the reduction factors show acceptable values for building height up to 50 meters and the decreasing rate of this coefficient is increased in the higher elevations. 7 1-Introduction Bearing reinforced concrete wall system is suitable for mid-rise buildings. According to number of walls in plan and reduce the share of lateral force, is suitable system and it can be performed quickly and with high quality [1-4]. Today major part of the seismic design of buildings based on the equivalent static method and calculation of seismic forces by applying the reduction coefficients called response reduction factor is done. In this study to evaluate the ductility of this structural system, several models with different stories selected and the ductility and reduction factor of these structures is investigated [6,7]. 2-Modeling the load-bearing wall For validation of modeling method and analysis in PERFORM-3D [5] software, a model of a wall made and according to the Fig. 1, analysis results of nonlinear static and nonlinear dynamic analysis with an acceptable error of about 5 to 10 percent, show the actual behavior of the wall [8]. 3-Structural models The typical plan is used for modeling structural system in different stories as shown in Fig. 2. The Non-linear static analysis is performed on models and capacity curves were obtained by PERFORM-3D software. [9-11].