大跨连拱拱桥动力特性及地震反应分析
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摘要
结合一座大跨连拱拱桥工程设计实例,采用sap2000程序建立了该桥空间有限元计算模型,分析了该桥的动力特性特点,采用反应谱法和时程分析法对该桥进行了地震反应分析。结果表明:由于各拱拱上立柱高度相差太大,使得各个立柱分担的上部结构的地震惯性力非常不均衡,拱顶附近的立柱由于高度较低、刚度较大,使得其承受较多的上部结构的地震惯性力,成为整个结构的抗震薄弱部位之一。
Based on an engineering design case of a long-multi-span arch bridge,a three-dimensional analysis model was developed using the FEA software sap2000.By response spectrum and time history method,the dynamic characteristic and seismic response of the bridge was discussed.The results indicate that owing to the differential of the columns on the arch,the seismic responses of the columns vary large.The short columns nearby the upper of the arch-ring,due to the larger stiffness which makes it bear more of the earthquake inertia of the superstructure,are most likely to be damaged by the severe earthquake.
Based on an engineering design case of a long-multi-span arch bridge,a three-dimensional analysis model was developed using the FEA software sap2000.By response spectrum and time history method,the dynamic characteristic and seismic response of the bridge was discussed.The results indicate that owing to the differential of the columns on the arch,the seismic responses of the columns vary large.The short columns nearby the upper of the arch-ring,due to the larger stiffness which makes it bear more of the earthquake inertia of the superstructure,are most likely to be damaged by the severe earthquake.
引文
[1]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[3]普瑞斯特雷.桥梁抗震设计与加固[M].袁万城,胡勃译.北京:人民交通出版社,1997.
[4]JTG/TB02—01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[3]普瑞斯特雷.桥梁抗震设计与加固[M].袁万城,胡勃译.北京:人民交通出版社,1997.
[4]JTG/TB02—01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
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