Impact Of The Stairs On The Seismic Performance Of Reinforced Concrete Buildings

Staircase as the most tranditional vertical transport corridors and the Emergency evacuation routes of the structure,its importance is of self-evidence.the existing structural design of different structural systems,don’t consider the staircase’impact.The designing analysis is simplified.The structural design punches hole in the floor slab of staircase and apply the load of staircase to the beams aroud.The staircase components is calculated individually without consider the seismic design.In the investigation after earthquake,it was found that a large number of staircase were destroyed in the earthquake and Since the destruction of the staircase, leading to more serious secondary disasters, casualties and property losses are also quite common. This shows that people need to strengthen the seismic design of the stairs, and consider the impact of staircase on the structure of the main seismic performance in order to ensure the staircase could play a stabilizing role in the green escape when the earthquake happen.Theoretical and experimental studies on the effects of seismic performance of the main structure by the staircase showed. Impact on the stairs on the frame structure is relatively large, while the frame-shear wall structure and the shear wall structure is relatively small. Base on these points,this paper use the application of the internathionally general structure analysis software SAP2000,in connection of the impact on the structure for the stairs,established a series of frame、frame-shear wall and shear wall structure comparison model and run the modal analysis and response spectrum analysis. To compare,under the condition of the frame structure、frame-shear wall structure、shear wall structure both with or without the staircase,the overall structure’s dynamic response and the forces’changes of structure’s components. Discussion stairwell depth direction’s shear wall number of changes to make the stairs arranged the impact on the overall structure variation; To analysis the force of the staircase structure’s components under the earthquake and compare it with the force without considering the earthquake. To propose some suggestions on the current design methods of staircase,and of the staircase-considered overall structures.