某大跨空间网架结构抗震加固数值分析研究
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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。
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.
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.
引文
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[3]董石麟.我国大跨度空间钢结构的发展与展望[J].空间结构,2000,6(2):3-13.
[4]陈天宜,雷云,陈文明,等.镇江体育会展中心体育会展馆屋盖结构设计[J].建筑结构,2010,40(9):53-55.
[5]葛家琪,黄季阳,王树,等.贵阳奥体中心主体育场罩篷钢结构抗震性能化设计研究[J].建筑结构,2010,40(12):1-4.
[6]刘锡良.十年来中国网架结构的发展[C]//第六届空间结构学术会议论文集,1992:42-51.
[7]任重.ANSYS实用分析教程[M].北京:北京大学出版社,2003.
[8]张文福,刘文洋,巨秀丽,等.网架结构固有振动分析的分解刚度法[J].工程力学,2007,24(3):138-141.
[9]白那.正放四角锥网架屋盖的固有振动与竖向地震作用研究[D].大庆:大庆石油学院,2004.
[10]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[11]郭晨喜.网架结构基于位移的抗震设计方法[D].北京:清华大学,2008.
[12]罗尧治,陈向阳,董石麟.组合网架的竖向地震响应分析[J].土木工程学报,2000,33(5):29-34.
[13]董石麟,钱若军.空间网格结构分析理论与计算方法[M].北京:中国建筑工业出版社,2000.
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