Investigating the Pounding of Adjacent Steel Braced Frames Equipped with Viscoelastic Damper

The collision of adjacent buildings with insufficient distance has been observed many times during earthquakes. The main reason for the collision between buildings is usually their out-of-phase vibration, which occurs due to the difference in the dynamic characteristics of the buildings. On the other hand, in the case of tall structures, the phenomenon of pounding between the upper parts of the structure is mostly caused by the effect of wave propagation. Among the issues that have happened in most of the huge earthquakes in the world is the issue of adjacent buildings hitting to each other. This phenomenon occurs due to out-of-phase vibration in buildings that are not far enough apart. Due to the increase in urban population, the vertical development of cities is inevitable. Since most of the large and important cities of the country are located in earthquake-prone areas, it is necessary to give more importance to the issue of buildings hitting each other during an earthquake and reducing its effect in order to reduce the life and financial risks associated with it. In this research, the modeling of adjacent structures and the effect of the impact force on the response of the structures and the examination of the distance of gap are checked. In order to investigate the effect of pounding on the structures, the steel braced frames (3 and 6 stories) are designed and nonlinear dynamic time history analysis is performed for the mentioned models and in case of pounding phenomenon, viscoelastic damper is used to reduce the impact force. The results showed that to apply viscoelastic damper has reduced the displacement significantly.