| The main factors that affect the seismic performance of long-span space structures are bearing capacity,structural stiffness and section size of members,etc.According to the research results of large-span space structure,this paper establishes and simplifies the model of a steel structure Indoor Gymnasium,which is simplified to steel structure.On this basis,the strengthening method of adding bracing is chosen to increase the overall stiffness,and the effect of the overall stiffness on the seismic performance of the structure under horizontal earthquake is studied.In this paper,the influence of structural stiffness on the interstory displacement angle,the distribution of plastic hinge,the interstory shear force and the structural vulnerability.The results show that:(1)Increasing the global stiffness of the structure can effectively improve the seismic performance of the structure,and has some effects on the inter-story Displacement Angle,inter-story Shear force,the distribution of plastic hinge and the change of structural vulnerability.The number of plastic hinge on the strengthened structure is 1 less than that on the strengthened structure,and the reduction rate is 25%.The number of plastic hinges decreases by 10 and the reduction rate is 20.8%,and the seismic resistance of the structure can be enhanced by increasing the total stiffness.(2)During the elastic analysis of the structure,the structure is in a good state under the action of frequent earthquakes,and the inter-story displacement angle of the structure decreases about 17.6% with the increase of the overall stiffness,the results show that the resistance of the structure to horizontal earthquake is effectively enhanced.(3)By adjusting the peak value of 21 selected seismic waves,the IDA curves of the structures before and after reinforcement are drawn and compared.By drawing the vulnerability curves of the structures under Io,LS and CP,the exceeding probability of the strengthened structures decreases,which indicates that increasing the overall stiffness can effectively improve the seismic performance of the strengthened structures. |
