预应力连续箱梁桥的基准动力有限元模型研究
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摘要
介绍了作为预应力混凝土连续梁桥的通扬运河特大桥的环境激励振动试验,并利用基于频域空间域分解的运行模态分析法进行模态参数识别,得到大桥的动力特性测试结果(模态频率和振型)。建立了大桥的初始空间有限元模型,利用上述测试结果,基于遗传算法对模型进行了修正,获得能基本准确反映上述桥梁实际结构动力行为的基准有限元模型,它可用于大桥的健康检测、状态评估和损伤识别。
The paper describes thefield ambient vibration testing on a prestressed concrete continuous box-girders,named Yongyang canal super bridge.The operational modal analysis(OMA) based on the frequency and spatial domain decomposition(FSDD) were used in the output-only data model identification,and the dynamic characteristics(natural frequencies and mode shapes) of the bridge were got.The complete three-dimensionalfinite element model of the bridge was established and updated based on the above results using genetic algorithm.The baseline-nite element model of the bridge were provided,which reflects the dynamic behaviors of the bridge structure and can serve as a baseline in the long-term health monitoring,condition evaluation and damage identication of the bridge in service.
The paper describes thefield ambient vibration testing on a prestressed concrete continuous box-girders,named Yongyang canal super bridge.The operational modal analysis(OMA) based on the frequency and spatial domain decomposition(FSDD) were used in the output-only data model identification,and the dynamic characteristics(natural frequencies and mode shapes) of the bridge were got.The complete three-dimensionalfinite element model of the bridge was established and updated based on the above results using genetic algorithm.The baseline-nite element model of the bridge were provided,which reflects the dynamic behaviors of the bridge structure and can serve as a baseline in the long-term health monitoring,condition evaluation and damage identication of the bridge in service.
引文
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[6]丁幼亮,李爱群,缪长青.面向结构安全评估的大跨斜拉桥基准有限元模型[J].东南大学学报(自然科学版),2007,37(2):261-265.
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[9]夏品奇,James MW Brownjohn.斜拉桥有限元建模与模型修正[J].振动工程学报,2003,16(2):119-223.
[10]费庆国,张令弥,李爱群,等.基于统计分析技术的有限元模型修正研究[J].振动与冲击,2005,24(3):23-26.37-39.
[11]余岭,万祖勇,朱宏平,等.基于POS算法的结构模型修正与损伤检测[J].振动与冲击,2006,25(5):37-39.
[12]周星德,明宝华,潘瑞鸿,等.基于遗传算法的降阶模型修正方法研究[J].振动、测试与诊断,2007,27(1):25-28.
[13]费庆国,李爱群,张令弥.基于神经网络的非线性结构有限元模型修正研究[J].宇航学报,2005,26(3):267-269.
[14]A Dall'Asta,L.Dezi St.Discussion about Prestress force e.ect on vibration frequency of concrete bridges[J].Journal ofStructural Engineering,1996,122(4):458.
[15]Hany Abdalli,John B.kennedy.Dynamic analysis of pres-tressed concrete beams with openings[J].Journal of Struc-tural Engineering,1995,121(7):1058-1068.
[2]Jong Jae Lee,Jong Won Lee,Jin Hak Yi,etc..Neural net-works-based damage detection for bridges considering errors inbaseline-nite element models[J].Journal of Sound and Vi-bration,2005,280:555-578.
[3]王彤,张令弥.运行模态分析的频域空间域分解法及其应用[J].航空学报,2006,27(1):62-66.
[4]Wei-Xin Ren,Xue-Lin Peng.Baselineˉnite element modelingof a large span cable-stayed bridge through eld ambient vibra-tion tests[J].Computers and Structures,2005,83:536-550.
[5]何旭辉,余志武,陈政清.既有铁路钢桁梁桥基准有限元模型建立与验证[J].振动与冲击,2007,26(12):117-121.
[6]丁幼亮,李爱群,缪长青.面向结构安全评估的大跨斜拉桥基准有限元模型[J].东南大学学报(自然科学版),2007,37(2):261-265.
[7]孟会英,陈秀云,雷世发.预应力混凝土连续弯箱梁桥动力特性分析与试验研究[J].世界地震工程,2008,24(1):128-131.
[8]宗周红,赖苍林,林友勤,等.大跨度预应力混凝土连续刚构桥的动力特性分析[J].地震工程与工程振动,2004,24(3):98-104.
[9]夏品奇,James MW Brownjohn.斜拉桥有限元建模与模型修正[J].振动工程学报,2003,16(2):119-223.
[10]费庆国,张令弥,李爱群,等.基于统计分析技术的有限元模型修正研究[J].振动与冲击,2005,24(3):23-26.37-39.
[11]余岭,万祖勇,朱宏平,等.基于POS算法的结构模型修正与损伤检测[J].振动与冲击,2006,25(5):37-39.
[12]周星德,明宝华,潘瑞鸿,等.基于遗传算法的降阶模型修正方法研究[J].振动、测试与诊断,2007,27(1):25-28.
[13]费庆国,李爱群,张令弥.基于神经网络的非线性结构有限元模型修正研究[J].宇航学报,2005,26(3):267-269.
[14]A Dall'Asta,L.Dezi St.Discussion about Prestress force e.ect on vibration frequency of concrete bridges[J].Journal ofStructural Engineering,1996,122(4):458.
[15]Hany Abdalli,John B.kennedy.Dynamic analysis of pres-tressed concrete beams with openings[J].Journal of Struc-tural Engineering,1995,121(7):1058-1068.
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