大跨悬索桥面向结构健康监测的基准有限元模型
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摘要
为描述大跨桥梁服役前完好状态时的结构性能,建立了润扬悬索桥面向结构健康监测的基准有限元模型。首先,探讨面向健康监测需求、建立适度精细基准模型的目标,提出了采用正交异性壳单元等效钢箱梁的建模策略。然后,就钢箱梁的简化模拟、桥塔的动力模型修正、成桥状态初始构形及内力的确定、主梁边界条件的确定和钢箱梁局部应力分析等关键技术问题进行了详细的研究。最后,对所建立的基准有限元模型采用润扬悬索桥成桥试验的实测结果进行了验证。结果表明,该基准模型能从整体结构尺度与局部构件尺度两个方面准确地模拟结构的实际性能,从而为润扬悬索桥的损伤识别与状态评估提供了可靠的结构描述与分析依据。
A structural-health-monitoring-oriented baseline finite element(FE) model of the Runyang Suspension Bridge is presented for the purpose of representing actual behaviours of complete bridge.The target of structural-health-monitoring-oriented moderate precise FE model was discussed firstly,and the modeling methodology of steel-box-girder using orthotropic shell element is proposed.Then,some important issues in the modeling process,such as the simplified modeling of steel-box-girder,the model updating of bridge tower,the initial equilibrium configuration of complete bridge,the boundary conditions of bridge deck,and the analysis of stress distribution in steel-box-girder,are studied in detail.Finally,the model validation using field-test results is conducted.Comparison shows that the proposed baseline model can be used as a reliable representation and analysis model for the damage diagnosis and condition assessment in structural health monitoring for the Runyang Suspension Bridge.
A structural-health-monitoring-oriented baseline finite element(FE) model of the Runyang Suspension Bridge is presented for the purpose of representing actual behaviours of complete bridge.The target of structural-health-monitoring-oriented moderate precise FE model was discussed firstly,and the modeling methodology of steel-box-girder using orthotropic shell element is proposed.Then,some important issues in the modeling process,such as the simplified modeling of steel-box-girder,the model updating of bridge tower,the initial equilibrium configuration of complete bridge,the boundary conditions of bridge deck,and the analysis of stress distribution in steel-box-girder,are studied in detail.Finally,the model validation using field-test results is conducted.Comparison shows that the proposed baseline model can be used as a reliable representation and analysis model for the damage diagnosis and condition assessment in structural health monitoring for the Runyang Suspension Bridge.
引文
[1]WONG K Y,CHAN W Y K,MAN K L.The use of structural healthmonitoring system in operation and maintenance of cable-supported bridg-es[C]∥In:One Day Annual Seminar Structural Symposium 2000Highway and Railway Structures.Hong Kong:2000:108-133.
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[3]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.
[4]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.
[5]郭彤,李爱群,卞朝东.基于蒙特卡罗数值模拟的大跨桥梁状态评估[J].公路交通科技,2005,22(8):26-30.
[6]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.
[7]刘毅.大跨悬索桥面向结构健康监测的有限元模拟研究[D].南京:东南大学,2005.
[8]丁幼亮,李爱群,缪长青,等.基于环境振动测试的润扬斜拉桥索塔的有限元模拟[J].公路交通科技,2006,23(7):57-63.
[9]XU Y L,KO J M,ZHANG W S.Vibration studies of Tsing Ma suspen-sion bridge[J].Journal of Bridge Engineering,ASCE,1997,2(4):149-156.
[10]东南大学土木工程学院.润扬长江公路大桥结构健康监测系统研究(南汊悬索桥南塔结构动力测试报告)[R].南京:东南大学,2002.
[11]潘永仁,杜国华,范立础.悬索桥恒载结构几何形状及内力的精细计算[J].中国公路学报,2000,13(4):33-36.
[12]江苏省长江公路大桥建设指挥部,东南大学土木工程学院,同济大学桥梁工程系.润扬长江公路大桥静动载试验报告[R].南京:江苏省长江公路大桥建设指挥部,2005.
[2]REN W X,PENG X L.Baseline finite element modeling of a large spancable-stayed bridge through field ambient vibration tests[J].Computersand Structures,2005,83(8/9):536-550.
[3]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.
[4]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.
[5]郭彤,李爱群,卞朝东.基于蒙特卡罗数值模拟的大跨桥梁状态评估[J].公路交通科技,2005,22(8):26-30.
[6]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.
[7]刘毅.大跨悬索桥面向结构健康监测的有限元模拟研究[D].南京:东南大学,2005.
[8]丁幼亮,李爱群,缪长青,等.基于环境振动测试的润扬斜拉桥索塔的有限元模拟[J].公路交通科技,2006,23(7):57-63.
[9]XU Y L,KO J M,ZHANG W S.Vibration studies of Tsing Ma suspen-sion bridge[J].Journal of Bridge Engineering,ASCE,1997,2(4):149-156.
[10]东南大学土木工程学院.润扬长江公路大桥结构健康监测系统研究(南汊悬索桥南塔结构动力测试报告)[R].南京:东南大学,2002.
[11]潘永仁,杜国华,范立础.悬索桥恒载结构几何形状及内力的精细计算[J].中国公路学报,2000,13(4):33-36.
[12]江苏省长江公路大桥建设指挥部,东南大学土木工程学院,同济大学桥梁工程系.润扬长江公路大桥静动载试验报告[R].南京:江苏省长江公路大桥建设指挥部,2005.
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