This study investigated into the effect of infill walls on behavior of reinforced-concrete (RC) special moment frames subjected to multiple earthquakes. For this purpose, 4, 8 and 12-storey RC frames in three cases of inclusion and exclusion of infill walls as well as inclusion of infill walls with openings are analyzed using OpenSees software. The nonlinear static and dynamic analyses are carried out on the models and for dynamic analyses, 20 main and aftershocks are taken into account. Accordingly, strength and stiffness of the structures are determined using nonlinear static (pushover) analysis and structural responses such as displacement ductility, rotational ductility and energy absorption are obtained from nonlinear dynamic analyses. The results indicate that inclusion of infill walls, increases stiffness and ultimate strength of the structure, but to the contrary, ductility and energy absorption are reduced. Among all models, the structures including infill walls, incurred intense strength loss owing to cracking and destruction of the infill walls. Comparison of results of the main shocks and aftershocks illustrates that contribution of the aftershocks, has raised the responses by 20–100% highlighting importance of aftershocks particularly for the structures with infill walls.

本研究调查了填充墙对遭受多次地震的钢筋混凝土（RC）特殊弯矩框架性能的影响。为此，使用OpenSees软件分析了在包含和排除填充墙以及包含开口的填充墙的三种情况下的4、8和12层RC框架。在模型上进行了非线性静态和动态分析，并为进行动态分析，考虑了20个主震和余震。因此，使用非线性静态（推力）分析确定结构的强度和刚度，并从非线性动力分析获得结构响应，例如位移延展性，旋转延展性和能量吸收。结果表明，包含填充墙，增加了结构的刚度和极限强度，但相反，延展性和能量吸收降低了。在所有模型中，包括填充墙的结构由于填充墙的开裂和破坏而导致严重的强度损失。对主要冲击和余震结果的比较表明，余震的贡献使响应提高了20-100％，突出了余震的重要性，特别是对于具有填充墙的结构。