Collapse Analysis Of Space Steel Frame Structure Based On Removing Component Method

With the rapid development of society,the demand for building structures is increasingly diverse,the steel structure is widely used for its excellent mechanical properties.In recent years,the occurrence of continuous collapse of steel structure under accidental loading has extremely resulted,causing serious consequences.Therefore,it is very important to study the collapse of steel st:ructure.The accidental loads that result in collapse of structural are varied,it is difficult to study quantitatively.According to the Alternate Load Path method introduced by the Specificat:ion of foreign collapse-resisting,ignore the cause of structure collapse,assume failure location of components,this paper combine OpenSees finite element software and removing component,then the structural responses under the nonlinear static Pushdown analysis and nonlinear dynamic analysis are analyzed in order to study the effects of different structural parameters on the structural collapse response.The main work and conclusibns are as follows.(1)Different size of space steel frame structure model is set up.The effect on the structure are researched by changing different structural parameters,such as structure storey number,storey height,span The results show that the location of the failure column,the span of structure and layer of structure has larger effect on anti-collapse performance,the height has little effect,and can be ignored.(2)Remove inside column,side column and corner column at the first layer of structure,then,study the process of plastic hinge development on the structure through the damaged across loading method for nonlinear static Pushdown analysis.The results find that the plastic hinge appear in this position of the first or the second beam end which is far from the failure location,and develops upward progressively.(3)Considering the influence of the multi-dimensional seismic action,study the multi-dimensional seismic effect of the influence of structure collapse response by the nonlinear dynamic analysis.The results show that the multi-dimensional seismic action will increase the deformation of the structure and bring more serious damage of the structure.