Seismic Performance Analysis And Design Of Different Stair Structures In High Rise Frame Shear Structures

Stair is the traffic component between the floors in the building,and is also the main channel for people to evacuate.In the Wenchuan earthquake,many buildings of the stairs damage is particularly serious,such as the filling wall staircase collapses,stair column fracture and stair stair plate damage and a series of damage phenomenon.Compared with the pure frame structure,the damage degree of the stairs of the frame shear wall structure is obviously reduced,but it is not rare and can not be ignored.To ensure the safety of people’s lives and property is the most important purpose of seismic design of building structures.When the earthquake occurs,the stairs should be used as the "safety island" in the building.This paper creates three models by Midas-gen,were not built into the stair stairs without stairs but imposing load model A,sliding bearing set whole cast-in-situ plate stairs model B and the boards of the ladder at the lower end of the stair slab model C.(1)for the three model response spectrum analysis using Midas-gen,three models of sequence and structural modal parameters from the main similarities and differences of structure vibration,seismic shear,the interlayer displacement of each layer,internal force structure,in the analysis and design of the structure,the stairs considering the superiority of sliding bearings for stairs.(2)elastoplastic time history analysis is carried out on the three Midas-gen model is used to study three kinds of three kinds of wave model of maximum drift angle,base shear and top displacement and acceleration time history curve peak difference,by the time history analysis results to determine the optimal design of the staircase,the staircase design for frame shear wall is a staircase as a whole system in the "safety island",to evaluate the seismic performance of the whole structure.(3)the structure of sliding bearing is summarized in this paper,and the influence of the sliding bearing on the seismic performance of frame shear wall structure issummarized.Based on the structure of the response spectrum analysis and elastic-plastic time history analysis,according to the analysis results,the staircase sliding bearings and integral cast-in-situ plate stairs and stair structure than because ladder section board is arranged at the lower end of the sliding bearing,the release of some supporting role,existing sliding bearings of the stairs with frame member the whole staircase shear wall system,the overall structure of the common work,but does not participate in the transfer of horizontal earthquake,it can prevent the damage to the safety first,the formation of "island of the staircase".This paper aims to study the seismic performance of high-rise frame shear wall structure in order to provide the basis for the design and lay a theoretical foundation for future research work.