| Nowadays,the structure collapse caused by earthquakes and shock loads is becoming more and more important.The collapse of the structure is divided into two types: progressive collapse and earthquake collapse.The progressive collapse of structure is the result of the explosion under normal conditions of use.And other structures caused by the damage caused by the loss of the building structure caused by the gradual expansion to the full range of the formation of the collapse of the structure of the earthquake collapsed that is the arrival of the earthquake,whether the structural requirements of the structure to the lateral collapse of the formation of within a certain range of needs,these are the hot issues of research,in the world of engineering has attracted a wide attention.In this paper,SAP2000 finite element software is used as the theoretical calculation method.The removal method is used to analyze the continuous collapse of the steel frame under the impact and explosion of the steel frame,and the failure of the bottom layer is different The resulting impact.For the analysis of earthquake collapse,IDA analysis method is used to carry out non-linear dynamic time-history analysis on the structure of the ground motion.The main failure performance points of the structure are discussed.At the same time,The main work of this paper is as follows:(1)The model of plane steel frame was established.In the analysis of anti-continuous collapse of building structure,the performance of anti-continuous collapse was studied from nonlinear static analysis,nonlinear dynamic analysis method and vertical IDA method.Damage and failure of the middle column are analyzed.It is found that the residual structure of the residual structure is worse after the failure of the side pillars,and the vertical displacement response of the failure point is greater.(2)In the analysis of the anti-continuous collapse of the building structure,the influence of the height of the bottom layer on the anti-continuous collapse of the building structure is compared,and it is suggested that the probability of the collapse of the bottom layer is not obvious In addition,when the dynamic amplification factor based on the load is introduced,it is found that the structural power amplification coefficient is about 1.3,and the US specification is 2.0,which is conservative.(3)Using the IDA analysis method,the seismic analysis of the steel frame is carried out,and several seismic waves are selected.The amplitude of the ground motion is continuously adjusted until the structure reaches the limit state.The data of the ground motion intensity are analyzed statistically And then the seismic vulnerability index of the damage point is obtained,and the seismic collapse collocation curve of the structure is drawn to obtain the anti-collapse reserve coefficient of the structure.This paper analyzes the differences of the anti-seismic collapse performance of the steel frame structures with different layers at the bottom layer,discusses the reasonable range of the increase control of the bottom layer,and analyzes the variation range of the anti-collapse reserve coefficient caused by the bottom layer The bottom layer of high growth,in order to avoid the structure of the earthquake probability of a significant increase. |
