大跨斜拉桥结构行为一致多尺度有限元模拟
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摘要
以润扬长江大桥北汊斜拉桥为实际工程背景,分析了同时考虑结构整体和局部细节特性的结构行为一致多尺度模拟方法在具体应用中的实施过程。以结构健康监测和损伤评估为目标,建立斜拉桥整体结构的三维多尺度有限元模型,桥面系采用分级多重子结构方法建立结构行为一致多尺度有限元模型。对建立起来的大跨桥梁结构多尺度有限元模型进行模态分析,并利用成桥试验数据从静力响应、动力特性等方面验证了多尺度模型的有效性。结果表明:建立的多尺度模型是有效的,其计算分析结果和成桥试验值之间的误差较小;分级建立结构行为一致多尺度模型的模拟方法有利于满足在结构健康监测系统设计、结构状态评估和结构损伤检测等各个不同阶段模型分析的需求。
Considering the global structural behavior and features of local details simultaneously,the whole process of implementing the concurrent multi-scale modeling of structural behavior(CMSM of SB) was discussed in details for Runyang Yangtse Cable-stayed Bridge(RYCB).For purpose of structural health monitoring and damage assessment,the three-dimension multi-scale finite element model was established for RYCB.The CMSM of SB of bridge deck was constructed using the multi-stage substructure method in different stages of structural analysis.Using the developed CMSM of SB,modal analysis was conducted and the model verification of the CMSM of SB was discussed through the experimental data on the dynamic characteristics and static response.Results show that error between calculated analysis result of CMSM and test value of bridge is small.It verifies feasibility of CMSM.Using multi-stage substructure method,the modeling of CMSM of SB will satisfy the necessity in the field of damage analysis of long-span bridges for different stages,such as the design of structural health monitoring,the structural state assessment and damage inspecting and so on.
Considering the global structural behavior and features of local details simultaneously,the whole process of implementing the concurrent multi-scale modeling of structural behavior(CMSM of SB) was discussed in details for Runyang Yangtse Cable-stayed Bridge(RYCB).For purpose of structural health monitoring and damage assessment,the three-dimension multi-scale finite element model was established for RYCB.The CMSM of SB of bridge deck was constructed using the multi-stage substructure method in different stages of structural analysis.Using the developed CMSM of SB,modal analysis was conducted and the model verification of the CMSM of SB was discussed through the experimental data on the dynamic characteristics and static response.Results show that error between calculated analysis result of CMSM and test value of bridge is small.It verifies feasibility of CMSM.Using multi-stage substructure method,the modeling of CMSM of SB will satisfy the necessity in the field of damage analysis of long-span bridges for different stages,such as the design of structural health monitoring,the structural state assessment and damage inspecting and so on.
引文
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[2]李凤臣,刘青,王大鹏,等.斜拉索索力识别精度的提高方法[J].建筑科学与工程学报,2008,25(4):42-46.LI Feng-chen,LIU Qing,WANG Da-peng,et al.Ten-sion Identification Precision Enhancement Method forStay Cable[J].Journal of Architecture and CivilEngineering,2008,25(4):42-46.
[3]邰扣霞,丁大钧.中国桥梁建设新飞跃[J].建筑科学与工程学报,2006,23(2):30-40.TAI Kou-xia,DING Da-jun.New Leaps in Construc-tion of Bridges in China[J].Journal of Architectureand Civil Engineering,2006,23(2):30-40.
[4]常军.基于曲率模态的钢筋混凝土梁多点损伤位置识别[J].建筑科学与工程学报,2006,23(4):24-27.CHANG Jun.Curvature Model Based Many DamageLocations Identification of Reinforced Concrete Beam[J].Journal of Architecture and Civil Engineering,2006,23(4):24-27.
[5]李兆霞,李爱群,陈鸿天,等.大跨桥梁结构以健康监测和状态评估为目标的有限元模拟[J].东南大学学报:自然科学版,2003,33(5):562-572.LI Zhao-xia,LI Ai-qun,CHEN Hong-tian,et al.Finite Element Modeling for Health Monitoring andCondition Assessment of Long-span Bridges[J].Jour-nal of Southeast University:Natural Science Edition,2003,33(5):562-572.
[6]郭力.面向结构状态评估的大跨桥梁有限元模拟及其应用[D].南京:东南大学,2005.GUO Li.Structural-state-assessment-oriented FiniteElement Modeling of Long Span Bridge and Its Appli-cations[D].Nanjing:Southeast University,2005.
[7]周太全.桥梁构件局部热点应力分析及其疲劳损伤累积过程模拟[D].南京:东南大学,2003.ZHOU Tai-quan.Hot Spot Stress Analysis of SteelBridge Components and Numerical Simulation of Fa-tigue Damage Accumulation[D].Nanjing:SoutheastUniversity,2003.
[8]徐伟,李智,张肖宁.子模型法在大跨径斜拉桥桥面结构分析中的应用[J].土木工程学报,2004,37(6):30-34.XU Wei,LI Zhi,ZHANG Xiao-ning.Application ofSubmodeling Method for Analysis for Deck Structureof Diagonal Cable-stayed Bridge with Long Span[J].China Civil Engineering Journal,2004,37(6):30-34.
[9]MICHOPOULOS J G,FARHAT C,FISH J.Model-ing and Simulation of Multiphysics Systems[J].Jour-nal of Computing and Information Science in Engin-eering,2005,5:198-204.
[10]孙正华,李兆霞,韩晓林.大跨桥梁桥塔有限元模型修正[J].工程抗震与加固改造,2006,28(1):50-54.SUN Zheng-hua,LI Zhao-xia,HAN Xiao-lin.FiniteElement Model Updating for the Tower of Long-spanBridges[J].Earthquake Resistant Engineering andRetrofitting,2006,28(1):50-54.
[11]孙正华,李兆霞.润扬斜拉桥有限元模拟及其模态分析[J].地震工程与工程振动,2006,26(2):25-32.SUN Zheng-hua,LI Zhao-xia.Finite Element Model-ing and Modal Analysis of Runyang Cable-stayedBridge[J].Earthquake Engineering and EngineeringVibration,2006,26(2):25-32.
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