PC斜拉式桁架梁桥敏感参数分析
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摘要
为了准确地把握PC斜拉桥在各施工阶段及营运阶段内力及线形变化情况,以某PC斜拉式桁架梁桥为例,借助大型有限元计算程序,建立了三维空间有限元模型。运用仿真分析方法,对该结构受力特性进行了相应的研究,得出混凝土收缩徐变、温度变化、非线性等敏感参数对该桥内力及线形的影响规律。结果表明:混凝土收缩徐变、非线性及刚度误差对结构内力影响较小,对结构挠度的影响较大,挠度变化值自中跨跨中向两侧呈线性递减趋势;温度与自重误差对结构的内力及线形影响相对较小,挠度变化值自跨中对称向两侧呈抛物线变化,而轴力变化值在全桥范围内分布较为均匀。
In order to accurately grasp variation situations of inner force and deflection for PC cable-stayed bridge during construction and running stage and study the mechanical characteristics of this type bridge,a PC oblique-pulling truss bridge was taken as the studying case.A three-dimensional space finite element model was built with the large-scale finite element calculation program.The related researches were carried on the structure by computer simulation analysis method.The influence rules and levels of the bridge static characteristics were obtained,which were affected by the sensitivity parameters,such as shrinkage and creep of concrete,changing of the temperature,nonlinearity and so on.The results indicate that shrinkage and creep of concrete,nonlinear and rigidity deviation have a less affection on inner force of bridge,while they have a greater affection on deflection of structure,and changes of deflection value linearity decrease from middle span to two side spans.But temperature and self-weights deviation have a smaller affection on deflection and inner force than the other sensitivity parameters and changes of deflection of them are taken as parabolic distribution from middle span to two side spans,while changes of inner force don't have much variation on the whole bridge.
In order to accurately grasp variation situations of inner force and deflection for PC cable-stayed bridge during construction and running stage and study the mechanical characteristics of this type bridge,a PC oblique-pulling truss bridge was taken as the studying case.A three-dimensional space finite element model was built with the large-scale finite element calculation program.The related researches were carried on the structure by computer simulation analysis method.The influence rules and levels of the bridge static characteristics were obtained,which were affected by the sensitivity parameters,such as shrinkage and creep of concrete,changing of the temperature,nonlinearity and so on.The results indicate that shrinkage and creep of concrete,nonlinear and rigidity deviation have a less affection on inner force of bridge,while they have a greater affection on deflection of structure,and changes of deflection value linearity decrease from middle span to two side spans.But temperature and self-weights deviation have a smaller affection on deflection and inner force than the other sensitivity parameters and changes of deflection of them are taken as parabolic distribution from middle span to two side spans,while changes of inner force don't have much variation on the whole bridge.
引文
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[2]项贻强,姚永丁,胡峰强.体外索加固T型刚构桥的静动力性能研究[J].中国公路学报,2004,17(1):39-44.XIANG Yi-qiang,YAO Yong-ding,HU Feng-qiang.Study of Static and Dynamic Behavior of T-shape RigidFrame Bridge Reinforced by Prestressed External Ten-don[J].China Journal of Highway and Transport,2004,17(1):39-44.
[3]郭健.混凝土斜拉桥主梁的非稳态温度场与应力场分析[J].中国公路学报,2005,18(2):65-68.GUO Jian.Analysis of Unsteady Temperature Gradientand Thermal Stress Field for Concrete Girder of Cable-stayed Bridge[J].China Journal of Highway andTransport,2005,18(2):65-68.
[4]李忠献,黄健,丁阳,等.不同地震激励下大跨度斜拉桥的地震反应分析[J].中国公路学报,2005,18(3):48-53.LI Zhong-xian,HUANG Jian,DING Yang,et al.Seis-mic Responses of Long-span Cable-stayed Bridges Un-der Different Patterns of Earthquake Excitations[J].China Journal of Highway and Transport,2005,18(3):48-53.
[5]刘小燕,颜东煌,张峰,等.预应力高强混凝土梁极限承载力分析[J].中国公路学报,2006,19(1):58-61.LIU Xiao-yan,YAN Dong-huang,ZHANG Feng,et al.Ultimate Load Analysis of Prestressed High-strengthConcrete Beam[J].China Journal of Highway andTransport,2006,19(1):58-61.
[6]颜东煌,陈常松,涂光亚.混凝土斜拉桥施工控制温度影响及其现场修正[J].中国公路学报,2006,19(4):71-76.YAN Dong-huang,CHEN Chang-song,TU Guang-ya.Temperature Influence and Its Field Correction DuringConstruction Control of Concrete Cable-stayed Bridge[J].China Journal of Highway and Transport,2006,19(4):71-76.
[7]颜东煌.斜拉桥合理设计状态确定与施工控制[D].长沙:湖南大学,2001.YAN Dong-huang.Determining of Reasonable DesignStates and Construction Controlling of Cable-stayedBridges[D].Changsha:Hunan University,2001.
[8]樊可清,倪一清,高赞明.大跨度桥梁模态频率识别中的温度影响研究[J].中国公路学报,2006,19(2):67-73.FAN Ke-qing,NI Yi-qing,GAO Zan-ming.Research onTemperature Influences in Long-span Bridge Eigenfre-quencies Identification[J].China Journal of Highwayand Transport,2006,19(2):67-73.
[9]陈太聪,韩大建.大跨度斜拉桥施工过程中的主梁节段自重识别[J].土木工程学报,2005,38(2):68-74.CHEN Tai-cong,HAN Da-jian.Identification of Self-weights Girders During the Construction Process of aLong Span Cable-stayed Bridge[J].China Civil Engi-neering Journal,2005,38(2):68-74.
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