An insufficient separation distance between adjacent buildings is the main reason for structural pounding during severe earthquakes. The lateral load resistance system, fundamental natural period, mass, and stiffness are important factors having the influence on collisions between two adjacent structures. In this study, 3-, 5- and 9-story adjacent reinforced concrete and steel moment resisting frames (MRFs) were considered to investigate the collision effects and to determine modification factors for new and already existing buildings. For this purpose, incremental dynamic analysis was used to assess the seismic limit state capacity of the structures using a developed algorithm in OpenSees software including two near-field record subsets suggested by FEMA-P695. The results of this paper can help engineers to approximately estimate the performance levels of MRFs due to pounding phenomenon. The results confirm that collisions can lead to the changes in performance levels, which are difficult to be considered during the design process. In addition, the results of the analyses illustrate that providing a fluid viscous damper between adjacent reinforced concrete and steel structures can be effective to eliminate the sudden changes in the lateral force during collision. This approach can be successfully used for retrofitting adjacent structures with insufficient in-between separation distances.

相邻建筑物之间的分隔距离不足是造成严重地震时结构震荡的主要原因。横向载荷阻力系统，基本自然周期，质量和刚度是影响两个相邻结构之间碰撞的重要因素。在这项研究中，考虑了3层，5层和9层的钢筋混凝土和钢制抗弯框架（MRF），以研究碰撞影响并确定新建筑物和现有建筑物的修改因子。为此，使用OpenSees软件中开发的算法（包括FEMA-P695建议的两个近场记录子集），使用增量动力分析来评估结构的地震极限状态能力。本文的结果可以帮助工程师大致估计由于撞击现象而产生的MRF的性能水平。结果证实，碰撞会导致性能水平的变化，这在设计过程中很难考虑。此外，分析结果表明，在相邻的钢筋混凝土和钢结构之间提供流体粘性阻尼器可以有效消除碰撞过程中横向力的突然变化。这种方法可以成功地用于翻新间隔距离不足的相邻结构。分析结果表明，在相邻的钢筋混凝土和钢结构之间提供流体粘性阻尼器可以有效消除碰撞过程中侧向力的突然变化。这种方法可以成功地用于翻新间隔距离不足的相邻结构。分析结果表明，在相邻的钢筋混凝土和钢结构之间提供流体粘性阻尼器可以有效消除碰撞过程中侧向力的突然变化。这种方法可以成功地用于翻新间隔距离不足的相邻结构。