大跨度斜拉立体桁架的弹塑性地震反应分析
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摘要
以大跨度斜拉立体桁架两塔三跨和一塔两跨两种常用的结构体系为对象,研究了在水平罕遇地震作用下的弹塑性地震反应,计算中考虑了几何非线性和材料非线性,其中材料非线性来源于立体桁架杆件的非线性。通过计算,找到了立体桁架在强震作用下的薄弱部位,并对弹性和弹塑性计算结果作了对比,其结论可供工程设计人员在设计时参考。
In this paper,under severe horizontal earthquake,elasto-plastic seismic response behavior about systems of two spans with one tower and three spans with two towers for cable-stayed space truss are studied by response spectrum method and time history analysis procedure.Geometric and material nonlinearity are considered,in which material nonlinearity only includes members of space truss.Weak locations of space truss can be found.Through comparing the results of elastic and elasto-plastic analysis,some conclusion can be drawn for reference to engineers.
In this paper,under severe horizontal earthquake,elasto-plastic seismic response behavior about systems of two spans with one tower and three spans with two towers for cable-stayed space truss are studied by response spectrum method and time history analysis procedure.Geometric and material nonlinearity are considered,in which material nonlinearity only includes members of space truss.Weak locations of space truss can be found.Through comparing the results of elastic and elasto-plastic analysis,some conclusion can be drawn for reference to engineers.
引文
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[2]王宏,郭彦林,崔晓强.索-拱杂交结构动力反应分析[J].工程力学,2003,20(1):44～48Wang Hong,Guo Yan-lin,Cui Xiao-qiang.Dynamicanalysis of cable-truss hybrid structures[J].Engineering Mechanics,2003,20(1):44～48(inChinese)
[3]Dai Zhou and Hong-yu Liu.Nonlinear analysis of cable-stayed spatial latticed structures[J].StructuralEngineering and Mechanics,2003,15(4):415～4364
[4]孙建琴,吴敏哲,李从林.斜拉立体桁架内力、位移特征分析与设计[J].建筑结构,2006,36(12):96～99Sun Jian-qin,Wu Min-zhe,Li Cong-lin.Features aboutinternal forces and displacements of cable-stayed spacetruss and several problems in design[J].BuildingStructure,2006,36(12):96～99(in Chinese)
[5]孙建琴.大跨度斜拉立体桁架的自振特性分析[J].世界地震工程,2008,24(3):30～35Sun Jian-qin.Study on dynamic behaviour of long-spancable-stayed space truss[J].World of EarthquakeEngineering,2008,24(3):30～35(in Chinese)
[6]GB50011-2001,建筑抗震设计规范[S]GB50011-2001,Code for seismic design of bulidings[S](in Chinese)
[7]Wei-Xin Ren and Makoto Obata.Elastic-Plastic SeismicBehavior of Long Span Cable-Stayed Bridges[J].JBridge Engrg,1999,4,194
[8]Aly S Nazmy.Nonlinear Earthquake Response Analysisof Long-span Cable-stayed Bridge Theory[J].Earthquake Engineering and Structural Dynamics,1990,19:45～62
[9]Aly S Nazmy.No-linear earthquake-response analysis oflong-span cable-stayed bridges:application[J].Earthquake Engineering and Structural Dynamics,1990,19,63～76
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