【摘要】 结合四川绵阳某体育馆钢结构网架实际工程,针对其在施工过程中遭遇地震影响且震后设防烈度提高的特殊性,采用ANSYS软件建立网架有限元模型。首先对该网架结构进行反应谱分析,得到结构的内力分布和变形情况,找出结构的相对薄弱部位,进行有针对性的加固补强。然后采用非线性时程分析法对比分析加固前后结构的位移响应,为在施工过程中受损且设防烈度提高后的网架结构加固设计提供参考。结果表明:局部3层处杆件的截面大小及布置形式对网架结构抗震性能影响大,对其进行加固后可以适应更高的设防烈度要求;采用位移作为网架结构抗震性能指标比较合理。更多还原

【Abstract】 The finite element model of a gymnasium with steel grid structure engineering of in Mianyang was established,which encountered earthquake effects during construction process and the earthquake fortification intensity was improved.The spectrum analysis was done at first,and the internal force distribution and deformation were got.The relatively weak positions were found out,and the targeted strengthening and reinforcement were done.Then the structural displacements before and after reinforcement were compared by nonlinear time history analysis,which can provide reference for reinforcement design of grid structure which was damaged in the construction process and fortification intensity has been improved.The results show that the cross-section size and layout forms of local three-layer members have great influence on seismic performance of grid structure,and it can satisty higher fortification intensity requirements after being strengthened.It is reasonable that displacement indexes are used to judge the seismic performance of grid structure.更多还原