罕遇地震下空心薄壁高墩大跨T形刚构桥弹塑性地震反应分析
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摘要
利用大型结构分析软件建立了空心薄壁高墩大跨T形刚构桥的空间抗震有限元模型,运用非线性动态时程反应方法进行了高烈度地震区罕遇地震作用下的弹塑性地震反应计算,并与线性时程法和反应谱法的计算结果进行了对比。同时对该结构的延性抗震性能进行了分析评价。结果表明空心薄壁高墩T形刚构铁路桥在罕遇地震下处于较弱的非线性受力状态,其受到的损伤仍然很小,具有较好的抗震能力,结构考虑非线性塑性反应后的地震力与弹性相比明显减小。
By using structure analysis software,a finite element model of a hollow thin-walled high-pier and large-span T-shape rigid frame bridge is built for seismic analysis.The elastic-plastic seismic response is calculated by using the nonlinear dynamic time-history response method for high-level earthquakes in high-intensity seismic regions.The results are compared by using the linear time-history and response-spectrum methods.The seismic ductility performance of the hollow thin-walled high-pier structure is also analyzed and evaluated.It is concluded that the hollow high-pier thin-walled T-shaped rigid frame railway bridge is in weak nonlinear state under high-level earthquake conditions;however,the damage is small,as it has good seismic-resistant capability.Compared with the elastic seismic response,the seismic forces experienced by the structure are significantly reduced in the nonlinear plastic response.
By using structure analysis software,a finite element model of a hollow thin-walled high-pier and large-span T-shape rigid frame bridge is built for seismic analysis.The elastic-plastic seismic response is calculated by using the nonlinear dynamic time-history response method for high-level earthquakes in high-intensity seismic regions.The results are compared by using the linear time-history and response-spectrum methods.The seismic ductility performance of the hollow thin-walled high-pier structure is also analyzed and evaluated.It is concluded that the hollow high-pier thin-walled T-shaped rigid frame railway bridge is in weak nonlinear state under high-level earthquake conditions;however,the damage is small,as it has good seismic-resistant capability.Compared with the elastic seismic response,the seismic forces experienced by the structure are significantly reduced in the nonlinear plastic response.
引文
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[2]吴小峰,孙启国,狄杰建,等.抗震分析反应谱法和时程分析法数值仿真比较[J].西北地震学报,2011,33(03):275-278.WU Xiao-feng,SUN Qi-guo,DI Jie-jian.A Numerical Simula-tion Comparison between Response Spectrum Analysis andTime History Analysis[J].Northwestern Seismological Jour-nal,2011,33(03):275-278.
[3]薜瑞杰,袁万城.国内外桥梁延性抗震构造设计比较[J].工程抗震与加固改造,2009,31(02):1-8.XUE Rui-jie,Yuan Wan-cheng.Comparison on Domestic andOverseas Constructional Details for Ductility Seismic Design ofBridge[J].Earthquake Resistant Engineering and Retrofit-ting,2009,31(02):1-8.
[4]梁智垚.桥梁高墩位移延性能力计算方法研究[J].工程抗震与加固改造,2005,27(05):57-62.LIANG Zhi-yao.Study on Calculational Methods of Displace-ment Ductility Capacity of Tall Pier[J].Earthquake ResistantEngineering and Retrofitting,2005,27(05):57-62.
[5]夏修身,陈兴冲,王常峰,等.高墩大跨连续刚构桥抗震性能研究[J].西北地震学报,2010,32(1):88-90.XIA Xiu-shen,CHEN Xing-chong,WANG Chang-feng,et al.Study on Seismic Performance of Tall-pier and Long-spanContinuous Rigid-framed Bridge[J].Northwestern Seismo-logical Journal,2010,32(1):88-90.
[6]胡文源,邹晋华.时程分析法中有关地震波选取的几个注意问题[J].南方冶金学院学报,2003,24(4):25-28.HU Wen-yuan,ZOU Jin-hua.Time History Analysis Methodfor Seismic Wave Selection of A Few Pay Attention to theProblem[J].Journal of Southern Institute of Metallurgy,2003,24(4):25-28.
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