大跨度钢箱提篮拱桥地震反应的分析方法
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摘要
基于有限元理论,应用大质量法(LMM)和拱脚固定法建立大跨度钢箱提篮连拱桥的空间动力计算模型.在考虑箱型拱肋翘曲和剪切变形的基础上,对连拱桥进行非线性地震时程反应分析,验证大质量法的科学性.复核了结构体系满足当地抗震设防要求,发现钢箱拱肋某些部位的扭力和剪力明显,建议设计时予以考虑.
Based on finite element theory,the 3 dimensional dynamic evaluation model of long-span X-style steel box-section arch bridge was created with large-mass method(LMM) and fixed arch foot method.Then its nonlinear time history seismic response was analyzed with a consideration of warping and shear deflections of box arches,so that the scientific reasonableness of LMM was verified.The checking computation proved that the structural system of the bridge was appropriate for the anti-seismic requirements.It was found,however,that the torsion and shear forces acting on some parts of the arch ribs were larger significantly,so that it should be suggested that both of them would be considered in design.
Based on finite element theory,the 3 dimensional dynamic evaluation model of long-span X-style steel box-section arch bridge was created with large-mass method(LMM) and fixed arch foot method.Then its nonlinear time history seismic response was analyzed with a consideration of warping and shear deflections of box arches,so that the scientific reasonableness of LMM was verified.The checking computation proved that the structural system of the bridge was appropriate for the anti-seismic requirements.It was found,however,that the torsion and shear forces acting on some parts of the arch ribs were larger significantly,so that it should be suggested that both of them would be considered in design.
引文
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[2]秦荣.计算结构动力学[M].第2版.南宁:广西师范大学出版社,1997.
[3]WAGNER W,GRUTTMANN F.Finite element analysis ofSaint-Venant torsion problem with integration of the elastic-plastic constitutive equations[J],Comput Methods Aool MechEngrg,2001,190:3 831-3 848.
[4]王建军.箱形拱桥静力分析与动力分析的QR法[D].南宁:广西大学,2004.
[5]WU Qingxiong,YOSHIMURA M,TAKAHASHI K,et al.Nonlinear seismic properties of the Second Saikai Bridge:Aconcrete filled tubular(CFT)arch bridge[J].EngineeringStructures,2006,28(2):163-182.
[6]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.
[7]谢开仲.大跨度钢管混凝土拱桥非线性地震反应分析与研究[D].南宁:广西大学,2005.
[8]谢旭.桥梁结构地震响应分析与抗震设计[M].北京:人民交通出版社,2006.
[9]谢开仲,陈光强,韦立林,等.中承式钢管混凝土拱桥静动载试验[J].兰州理工大学学报,2005,31(6):111-114.
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