The Research Of Staircase Affect On Structure Seismic Performance And Its Seismic Design Method

For a long time,people think staircase is just a subsidiary part of structure so the bracing effect of staircase dose not been considered at calculating and designing procedure, only to punch hole in the floor slab where staircase is located, and apply vertical load of staircase to its surrounding components. A large number of staircases were destroyed in earthquake, showing that people need to recognize again the relationship between staircase and main structure. Staircase is an essential part of building structure, special when disaster comes in. Staircase is the main channel by which people escape, therefore its security must be guaranteed.This article firstly reviews the achievement in domestic and international in this field. Because WenChuan had just experienced a violent earthquake, therefore the research of staircase is a very active field at present, so the induction mainly about the domestic research results and provides reference for next research steps.This article designs three kinds of analyzed examples according project examples, and does comparative analysis between the situation with and without staircase. Under the supposition of material elastic condition, utilizing mode analysis method and response spectrum theory, this article contrasts and analyzes the influence caused by staircase to the seismic properties of main structure; This article contrasts and analyzes the influence caused by the different arrangement position of staircase to seismic properties of frame structure; This article analyzes internal force of the stair hall components; This article also utilizes elastic time history analysis to conduct the supplement research to the frame construction, causing the analysis at elastic stage to be more perfect. Research finds staircase have an important influence on frame structures, so many aspects need to be paid special attention in design.Next, based on the damaged plastic materials, this article analyzes the seismic performance of frame structures under action of rarely met earthquake; This article analyzes the bracing role of staircase on main structure and internal forces of itself; This article analyzes the location and degree of concrete damage or reinforced plastic deformation of staircase and its surrounding structures,Finally, summarizes the research results, proposed the design proposal about how to consider the staircase participated in the working of building structure.