Nowadays, retrofitting-damaged buildings is an important challenge for engineers. Finding the optimal placement of Viscous Dampers (VDs) between adjacent structures prone to earthquake-induced pounding can help designers to implement VDs with optimizing the cost of construction and achieving higher performance levels for both structures. In this research, the optimal placement of linear and nonlinear VDs between the 3-story, 5-story, and 9-story Steel and RC Moment-Resisting Frames (SMRFs and RC MRFs) is investigated. It is shown that the pounding phenomenon can significantly affect the seismic performance capacities of buildings during earthquakes, and using VDs can improve the seismic limit-state capacities of buildings for retrofitting purposes. For this goal, the seismic limit-state capacities of both colliding structures were assessed using Incremental Dynamic Analysis (IDA) assuming Near-fault Pulse-Like, Near-fault No-Pulse, and Far-Fault seismic records suggested by FEMA-P695. To perform IDAs, structures were modeled according to the seismic codes using a developed algorithm in Matlab and OpenSees software with the ability to remove a collapsed structure during the analysis. The results present an optimal placement for using VDs between structures and also compare the possible conditions to implement VDs. Using these results, engineers can approximately predict the seismic performance levels of both structures prone to earthquake-induced pounding and their final performance after retrofitting. Finally, retrofitting modification factors were proposed to help designers to predict the limit-state performance levels of retrofitted colliding structures without involving complicated and time-consuming analyses.

如今，对受损建筑进行改造是工程师面临的重要挑战。在容易发生地震冲击的相邻结构之间找到粘性阻尼器 (VD) 的最佳位置，可以帮助设计人员实施 VD，优化施工成本并为两种结构实现更高的性能水平。在这项研究中，研究了 3 层、5 层和 9 层钢和 RC 抗弯框架（SMRF 和 RC MRF）之间线性和非线性 VD 的最佳放置。结果表明，冲击现象会显着影响建筑物在地震期间的抗震性能，使用 VD 可以提高建筑物的抗震极限状态能力以进行改造。为了这个目标，假设 FEMA-P695 建议的近断层脉冲、近断层无脉冲和远断层地震记录，使用增量动态分析 (IDA) 评估了两种碰撞结构的地震极限状态能力。为了执行 IDA，使用 Matlab 和 OpenSees 软件中开发的算法根据地震代码对结构进行建模，并能够在分析过程中移除倒塌的结构。结果显示了在结构之间使用 VD 的最佳位置，并比较了实施 VD 的可能条件。使用这些结果，工程师可以大致预测容易发生地震冲击的两种结构的抗震性能水平以及改造后的最终性能。最后，