钢管混凝土拱桥的动力稳定极限承载力研究
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摘要
从结构极限承载力的角度研究钢管混凝土拱桥在地震作用下的动力稳定性能。基于大型通用有限元程序ANSYS的应用平台,使用其APDL语言,采用B-R运动准则结合动态增量法(IDA)提出用特征响应寻求钢管混凝土拱桥动力稳定极限承载力的研究方法,分析地震动输入方向、结构几何非线性、材料非线性及其结构初始缺陷模式和大小对动力稳定极限承载力的影响,结果表明横向输入对拱桥稳定最为不利,材料非线性的影响比几何非线性影响大,几何初始缺陷会降低拱桥的动力稳定极限承载力,其中以反对称最为不利。最后,通过对一钢管混凝土模型拱桥的振动台试验的分析比较,表明该方法的正确性和工程适用性,可为系统研究钢管混凝土拱桥的动力稳定性能提供理论分析基础。
The dynamic stability of concrete filled steel tubular(CFST)arch bridges under earthquakes is studied with respect to the structural ultimate bearing capacity.Based on the finite element software package(ANSYS),a method for using representative responses to study the dynamic ultimate capacity of CFST arch bridges is proposed by application of Incremental Dynamic Analysis in combination with the B-R dynamic criteria.The influence factors,such as earthquake input directions,geometric and material non-linearities,and the initial imperfection modes and magnitudes,are investigated.The results indicate that the bridge is affected the most by lateral earthquake input,that material non-linearity has a more serious effect than geometric non-linearity,and that the initial imperfection reduces the ultimate capacity,and the anti-symmetrical mode might be the worst case.The method is compared with a CFST model arch shaking table test,the result of which indicates that the method proposed is correct and applicable in engineering practice.
The dynamic stability of concrete filled steel tubular(CFST)arch bridges under earthquakes is studied with respect to the structural ultimate bearing capacity.Based on the finite element software package(ANSYS),a method for using representative responses to study the dynamic ultimate capacity of CFST arch bridges is proposed by application of Incremental Dynamic Analysis in combination with the B-R dynamic criteria.The influence factors,such as earthquake input directions,geometric and material non-linearities,and the initial imperfection modes and magnitudes,are investigated.The results indicate that the bridge is affected the most by lateral earthquake input,that material non-linearity has a more serious effect than geometric non-linearity,and that the initial imperfection reduces the ultimate capacity,and the anti-symmetrical mode might be the worst case.The method is compared with a CFST model arch shaking table test,the result of which indicates that the method proposed is correct and applicable in engineering practice.
引文
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[2]韩强.弹塑性系统的动力屈曲和分叉[M].北京:科学出版社,2000
[3]沈祖炎,叶继红.运动稳定性理论在结构动力分析中的应用[J].工程力学,1997,14(3):21-28
[4]徐艳,胡世德.大跨径钢拱桥的横向非线性地震响应分析[J].同济大学学报,2004,32(7):878-883
[5]郭海山,王林安.水平阶跃荷载作用下单层球面网壳结构的动力稳定性[J].哈尔滨建筑大学学报,2002,35(5):17-22
[6]王策,沈世钊.单层球面网壳结构动力稳定分析[J].土木工程学报,2000,33(6):17-24
[7]Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural dynamics,2002,31:491-514
[8]胡世德,苏虹,等.钢管混凝土拱桥的三维弹塑性地震反应理论分析[J].中国公路学报,2004,17(1):57-61
[9]韦建刚,陈宝春.钢管混凝土拱材料非线性有限元分析方法[J].福州大学学报,2004,32(3):344-348
[10]钢管混凝土拱桥抗震性能研究[R].土木工程防灾国家重点实验室开放课题总结报告.2003
[11]曾国峰.钢管混凝土系杆拱桥极限承载力研究[D].上海:同济大学,2003
[12]姚坚,宋伯铨.弹性圆拱在考虑几何非线性和初始缺陷情况下的动力稳定性分析[J].计算结构力学及其应用,1992,9(3):253-262
[13]徐艳,胡世德.钢管混凝土模型拱的弹性动力稳定性研究[J].同济大学学报,2005,33(1):6-10
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