大跨薄壁墩连续刚构桥抗震性能分析
|
摘要
以武汉在建的天兴洲大桥南岸引桥大跨度连续刚构桥为研究对象,运用AN SY S对其动力特性进行了分析.得到了成桥状态下结构的自振特性及有效振型参与质量,确定了运用反应谱法对地震作用进行振型组合时所必须的振型阶数,并结合反应谱法和时程分析法对该桥进行了地震反应分析,分别得到各概率地震作用下结构的反应最大值,同时比较了两种方法的分析结果.根据“三水准”设防原则,分析评价了该桥的综合抗震性能,为该桥的建设和抗震设计提供了参考,也为进一步研究该类桥型的抗震性能提供了分析基础.分析结果表明,该桥具有足够的抗震能力,能够满足预期的设计性能.
Based on the engineering design case of a large-span continuous rigid frame bridge which is a south approach of Tianxingzhou bridge in Wuhan city,its dynamic characteristics are analyzed by using the finite element software package ANSYS.In this paper,dynamic characteristics and the effective mode participation mass under finish-bridge status are gotten,and the minimum effective number of modes for mode combination of response spectrum analysis is determined.In addition,the maximum seismic responses of this bridge obtained from both response spectrum method and time history analysis method separately are compared.Based on the characteristics mentioned above,according to three level security principle,the antiseismic performance of this bridge is also evaluated with these methods.Results obtained in this paper can be served as useful guidelines to the construction and seismic design of the bridge.This systematic work offers analytical basement and guidance on effective antiseismic design as well as theoretical research of this type of bridges.Results show that the bridge can offer enough antiseismic bearing capacity and meet the expected design goal.
Based on the engineering design case of a large-span continuous rigid frame bridge which is a south approach of Tianxingzhou bridge in Wuhan city,its dynamic characteristics are analyzed by using the finite element software package ANSYS.In this paper,dynamic characteristics and the effective mode participation mass under finish-bridge status are gotten,and the minimum effective number of modes for mode combination of response spectrum analysis is determined.In addition,the maximum seismic responses of this bridge obtained from both response spectrum method and time history analysis method separately are compared.Based on the characteristics mentioned above,according to three level security principle,the antiseismic performance of this bridge is also evaluated with these methods.Results obtained in this paper can be served as useful guidelines to the construction and seismic design of the bridge.This systematic work offers analytical basement and guidance on effective antiseismic design as well as theoretical research of this type of bridges.Results show that the bridge can offer enough antiseismic bearing capacity and meet the expected design goal.
引文
[1]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.
[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[3]范立础,李建中,王君杰.高架桥梁抗震设计[M].北京:人民交通出版社,2001.
[4]叶爱君,胡世德,范立础.大跨度桥梁抗震设计实用方法[J].土木工程学报,2001,34(1):1-6.
[5]K iuregh ian A d,N euenhofer A.R esponse SpectrumM ethod for M u lti-support Se ism ic Exc itations[J].E arthquake Eng ineering&S tructura l D ynam ics,1992,21(6):713-740.
[6]赵大亮,李爱群,丁幼亮,等.大跨度桥梁地震反应谱的发展[J].公路交通科技,2006,23(2):79-82.
[7]S inha R,Lgusa T.CQC and SRSS M ethods for N o-nclass ica lly D am ped S tructures[J].E arthquakeEng ineering&S tructura l D ynam ics,1995,24(6):615-619.
[8]韦晓,袁万城,王志强,等.关于桥梁抗震设计规范反应谱若干问题[J].同济大学学报,1999,27(2):224-228.
[9]JT J 004-89,公路工程抗震设计规范[S].
[10]秦权,白刚,王建秀.斜拱面非对称钢箱系杆拱桥的抗震分析[J].工程力学,2005,22(3):152-156.
[11]JG J 3-2002,高层建筑混凝土结构技术规程[S].
[12]林家浩,张亚辉,赵岩.大跨度结构抗震分析方法及近期进展[J].力学进展,2001,31(3):350-360.
[13]钟万勰,林家浩,吴志刚,等.大跨度桥梁分析方法的一些进展[J].大连理工大学学报,2000,40(2):127-135.
[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[3]范立础,李建中,王君杰.高架桥梁抗震设计[M].北京:人民交通出版社,2001.
[4]叶爱君,胡世德,范立础.大跨度桥梁抗震设计实用方法[J].土木工程学报,2001,34(1):1-6.
[5]K iuregh ian A d,N euenhofer A.R esponse SpectrumM ethod for M u lti-support Se ism ic Exc itations[J].E arthquake Eng ineering&S tructura l D ynam ics,1992,21(6):713-740.
[6]赵大亮,李爱群,丁幼亮,等.大跨度桥梁地震反应谱的发展[J].公路交通科技,2006,23(2):79-82.
[7]S inha R,Lgusa T.CQC and SRSS M ethods for N o-nclass ica lly D am ped S tructures[J].E arthquakeEng ineering&S tructura l D ynam ics,1995,24(6):615-619.
[8]韦晓,袁万城,王志强,等.关于桥梁抗震设计规范反应谱若干问题[J].同济大学学报,1999,27(2):224-228.
[9]JT J 004-89,公路工程抗震设计规范[S].
[10]秦权,白刚,王建秀.斜拱面非对称钢箱系杆拱桥的抗震分析[J].工程力学,2005,22(3):152-156.
[11]JG J 3-2002,高层建筑混凝土结构技术规程[S].
[12]林家浩,张亚辉,赵岩.大跨度结构抗震分析方法及近期进展[J].力学进展,2001,31(3):350-360.
[13]钟万勰,林家浩,吴志刚,等.大跨度桥梁分析方法的一些进展[J].大连理工大学学报,2000,40(2):127-135.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心