Analysis Of Collapse Resistance Of Damaged Reinforced Concrete Frame Structure Under Earthquake

Over the years,the same area has suffered from multiple earthquakes frequently in a short period of time,and the collapse resistance of building structures under multiple earthquakes has gradually attracted the attention of scholars at home and abroad.Every time a large number of seismic data show that large earthquakes are generally accompanied by aftershocks and even strong aftershocks,the structure under the effect of main components produced certain damage,but the aftershocks and main short time interval,the main form of damage cannot get timely repair,subsequent aftershocks(strong)can lead to injuries in the structure of component damage,even collapse.At present,most of the studies on collapse resistance of structures under earthquake action basically only consider single earthquake action and take intact structures as the object of study.There is very little research on the collapse resistance of damaged structures under earthquake action.Therefore,this paper studies the anti-collapse performance of damaged structures under earthquake.Therefore,the collapse resistance of damaged structures under earthquake is studied in this paper.The main research work is as follows:(1)Based on the Open Sees finite element platform,a simulation analysis method that considers the tensile fracture failure process of steel bars was used to conduct a numerical calculation analysis of the collapse resistance of the beam column structure and the singlelayer plane frame test results.The numerical simulation method was verified by comparing the simulation results with the test results The applicability and effectiveness of the paper,and discussed the influence of the ultimate tensile strain of the steel bar on the collapse resistance of the structure,and then carried out the collapse resistance analysis of the multi-layer planar frame structure and the space frame structure,and studied the position of the shift column and the space frame span The effect of the anti-collapse of the space frame structure is analyzed,and the stress mechanism of the structural collapse process under the condition of dismantling the corner column and the side column is analyzed,and the relevant suggestions of the structural anti-collapse design are given.(2)Introduced the application principles of equal-effect method and damage index method.Using the equal-effect method and damage index method to carry out numerical simulation calculation on the same plane frame structure with damaged vertical members under earthquake action Results The two aspects were compared,and the damage index method was selected for subsequent collapse analysis of plane and space frame structures.(3)In order to study the anti-collapse performance of the reinforced concrete plane frame structure with damaged columns under earthquake action,12 near-field seismic waves were selected,and the incremental dynamic nonlinear analysis was performed based on the damage index method.In the analysis,the seismic response of the structure with a large vertical response to seismic waves was selected to analyze the vertical continuous collapse resistance of the structure,and the effects of the damage degree and the position of the damaged column on the collapse resistance of the planar structure under earthquake were discussed.The results show that the greater the degree of damage of the damaged column,the greater the possibility of vertical collapse;when the damaged column is double column,it is more likely to collapse than when the damaged column is single column,and the possibility of vertical continuous collapse is greater than the lateral increase The amount collapsed.(4)Based on the damage index method,the same seismic record is used to perform incremental dynamic nonlinear analysis of the space frame,and the damage degree of the main shock and the position of the main shock damage column to the collapse resistance of the spatial structure under earthquake influences.The results show that the collapse resistance of the space frame structure with damaged columns is better than that of the plane frame structure.When the damaged column is a single column,the position of the damaged column has little effect on the collapse performance and collapse form of the structure.When it is a single column,it is more likely to collapse.