عنوان مقاله [English]
In this study, the behavior of viscous dampers as energy absorbing devices in structures subjected to seismic excitations is investigated. Perform-3D software is used to numerically model a typical 5-span steel frame of, approximately, a 50 meter building. The model is representative of an existing building which incorporates viscous dampers to improve seismic performance. The frame model was analyzed using different acceleration time series. An evaluation was performed to examine effects of various damper arrangements on the seismic performance of the building; the number of dampers at each level, damper locations in various spans of the steel frame, and the distribution of various dampers in spans and levels of the frame. Based on the results of the current study and a meta-analysis of the findings of previous research, an optimal arrangement of dampers for improving the seismic performance of the structure is proposed. The most significant research results are as follows: 1. Increasing the number of viscous dampers at each level has no considerable effect on the seismic behavior of the structures. 2. Changing the direction of the dampers at each span has a considerable effect on analysis results. 3. Locating dampers at lower levels is more efficient than at higher levels. 4. Locating dampers at the middle span of each level is better for improvement of the seismic behavior of the structure.