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چکیده
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Construction of diagonal reinforcement in concrete coupling beam is dicult; therefore, its replacement is steel coupling beam. A review of the related literature shows that a few studies have considered seismic behavior of RC coupled wall with steel coupling beam. In this paper, the in uence of an increase in building height on the seismic nonlinear behavior of dual structural systems in the form of RC frames accompanied with RC coupled shear walls once with concrete, and then with steel coupling beam was investigated. Therefore, the buildings with 7, 14, and 21 stories and containing RC coupled wall systems with concrete and steel coupling beams were used to perform the pushover analysis with di erent load patterns. Some seismic parameters, such as ductility factor, response modi cation factor due to ductility, over-strength factor, response modi cation factor (R), and displacement ampli cation factor (Cd) were studied. Regarding the results, the response modi cation factor for the mentioned structural system is higher than the values used in codes of practice for seismic resistant design of buildings. In addition, the displacement ampli cation factor and the response modi cation factor increase as the structure height decreases and the values of these factors at steel coupling beam structures are higher than those at concrete coupling beams.
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