Hardware Research On The Measurement System Of Ring Laser Resonant Cavity

This thesis mainly analyzes the influence of stairs on seismic performance of high-rise shear wall through the model structure. Stiffness of stairs is not taken into consideration to the structure,thus,stairs contribute nothing to its whole structural work,but its vertical load.the result is the ignorance of seismic performance on stairs.All previous earthquake have showed different degrees of damage,what was worse,some stairs even destroyed before the collapse of the main structure,which lead that,the staircase-the only way of escape totally lose its function.the tragedy were could avoided.For this reason,I take part in my mentor’s found project:research of shan xi technology Gallery on 《The simulation analysis about the stairs involved in whole structural calculation)) (2010K01-073).This paper discuss a branch of it--he influence of stairs on seismic performance of high-rise shear wall structure.This paper mainly talks about using the finite element software Etabs modeling a practical engineering for more accurate analysis than pkpm does.The purpose is to find out the influence of staircase on seismic performance of high rise shear wall structure.The main content of the research is to use Etabs program software,respectively set up:(1)Modeling based Etabs on general practice defined stair as opening in model.(2)According to the actual situation will be scissors ladder according to the inclined plate (slab) input of the model.Respectively using modal decomposition response spectrum method and time history analysis method, the multiple model under the action of earthquake internal force calculation. Through the cycle, the floor displacement, stiffness and the comparison of the calculated results of conclusion. Stair analysis of high-rise shear wall structure on the dynamic characteristics and the influence of the overall mechanical performance.Main conclusions: 1, after considering the stairs involved in whole structural stress, the structure of the natural cycle.2, because the stair ladder plate under the action of horizontal force has "brace" stress, under horizontal seismic action, will produce larger axial stress; Stair board from us only considering the vertical force of flexural member, into a "bent and bent" components, complex stress state. After 3, consider the stairs to participate in the spatial structure analysis, the horizontal lateral stiffness increases, stair structure will follow to increase the level of the whole lateral stiffness distribution. So under horizontal seismic action, stair assigned to significantly larger shear than other place. Especially the rest of the platform stairs beam and stair column, the force is very adverse.4, stair components under the seismic action of stress, the more simple, for the protection of stair components will be the better; The stairs as the important role of evacuation passageway will be saved, forming a "safety island".