Earthquake response analysis for stairs about frame structure

Based on the 2008 code for anti-seismic design of the buildings, the earthquake damages about the staircases and stairs in Wenchuan Earthquake are briefly analyzed. To study the stair influence about frame structure for seismic performances, the structural dynamic property about the stair location, the whole structure response and the bearing capacity of the stair components are analyzed through computational datum of ETABS software. The analyses shows that the supporting effect of staircases alters natural period, angular displacement between the layers and internal forces in frame columns of the whole structure and makes great influence on the whole structure strength. We should pay much attention to the seismic design about stairs. Some concepts of earthquake-proof design and construction measures are also put forward in the paper.