大跨径连续刚构桥抗震性能评价
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摘要
以武汉在建天兴洲大桥南岸引线某大跨径连续刚构桥为研究对象,考虑桩-土-结构共用作用情况,运用大型有限元分析程序ANSYS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累计振型参与质量比,确定了运用反应谱法对地震作用进行振型组合时所必需的振型阶数。对该桥进行了地震反应谱分析,得到各概率地震作用下结构的反应最大值,并根据"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。
On the basis of the engineering design case of a long-span continuous rigid frame bridge which is a south approach of Tianxingzhou Bridge in Wuhan City,the dynamic characteristics of this kind of structure are analysed and studied using the finite element software package ANSYS and taking pier-earth-structure interacting into account.In this paper,dynamic characteristics and the effective mode participation mass under finish-bridge status are got,and the minimum number of modes for mode effective structural response spectrum analysis is determined.In addition, the maximum seismic responses of this bridge obtained from response spectrum method.Based on all of these characteristics mentioned above,according to three-level security principles,the antiseismic performance of this bridge is also evaluated.Results obtained in this paper can be served as useful guidelines to 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.
On the basis of the engineering design case of a long-span continuous rigid frame bridge which is a south approach of Tianxingzhou Bridge in Wuhan City,the dynamic characteristics of this kind of structure are analysed and studied using the finite element software package ANSYS and taking pier-earth-structure interacting into account.In this paper,dynamic characteristics and the effective mode participation mass under finish-bridge status are got,and the minimum number of modes for mode effective structural response spectrum analysis is determined.In addition, the maximum seismic responses of this bridge obtained from response spectrum method.Based on all of these characteristics mentioned above,according to three-level security principles,the antiseismic performance of this bridge is also evaluated.Results obtained in this paper can be served as useful guidelines to 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
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[2]范立础,王君杰.桥梁抗震设计规范的现状与发展趋势[J].地震工程与工程振动,2001,21(2).
[3]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).
[4]A Kiureghian,A Neuenhofer.Response spectrum me-thod for multi-support seismic excitations[J].Earthquake Engineering&Structural Dynamics,1992,21(6).
[5]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).
[6]M Berrah,E Kausel.Response spectrum analysis ofstructures subjected to spatially varying motions[J].Earthquake Engineering&Structural Dynamics,1992,(21).
[7]R Sinha,T Lgusa.CQC and SRSS methods for non-classically damped structures[J].Earthquake Eng-ineering&Structural Dynamics,1995,24(6).
[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).
[9]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).
[10]JGJ 3-2002,高层建筑混凝土结构技术规程[S].
[11]G Mylonakis,A Nikolaou,G Gazetas.Soil-Pile-Bridge seismic interaction:Kinematic and Inertialeffects[J].Earthquake Engineering&StructuralDyna-mics,1997,26(3).
[12]JTJ 024-85,公路桥梁地基与基础设计规范[S].
[13]何波,朱宏平,李俊,等.大跨度薄壁墩连续刚构桥抗震性能分析[J].华中科技大学学报(城市科学版),2006,23(4).
[14]M L Wang,G Heo,D Satpathi.Dynamic charac-terization of a long span bridge:a finite elementbased approach[J].Soil dynamics&earthquakeengineering,1997,(16).
[15]JTJ 004-89,公路工程抗震设计规范[S].
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