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首页> 外文会议>Innovative infrastructures - toward human urbanism : Report >Seismic Response Prediction of Base Isolated Multi-Span Highway Bridge With Different Modeling Techniques for Lead Rubber Bearings.
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Seismic Response Prediction of Base Isolated Multi-Span Highway Bridge With Different Modeling Techniques for Lead Rubber Bearings.

机译：铅芯橡胶支座采用不同建模技术的基础隔震多跨公路桥梁地震响应预测。

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The effect of modeling of lead rubber bearings (LRBs) on seismic responses of the isolated bridge isrnevaluated by conducting nonlinear dynamic analyses. The model parameters used in the simulationrnhave been identified from experimental measurements under room (+23℃) and low temperature (-rn20℃) conditions. Three different analytical models of the isolation bearings (LRBs) are considered inrnsimulation for comparison; the conventional bilinear model as specified by Japan Road Associationrn(JRA) and American Association of State Highways and Transport Officials (AASHTO), a rheologyrnmodel and a simplified model. The general rheology model considers the observed nonlinear elastoplasticrnand viscosity induced rate-dependent behavior into account, while the viscosity effect isrneliminated in the simplified version. A tri-linear hysteretic model is employed in the analysis forrnrepresenting the nonlinear mechanical behavior of the concrete bridge pier. A numerical algorithm forrnsolving the first order governing differential equation of the rheology model has been developed tornimplement the proposed models into a nonlinear dynamic analysis software. Six different strongrnground motions of level-2 earthquake as recommended by JRA, applied in the longitudinal direction,rnare used in the analysis. The seismic response of an isolated bridge system is studied by comparing thernrotation responses of the plastic hinge in concrete piers and shear strain responses at the top of thernbearings for different modelling techniques of an isolation system. Finally, a comparative assessmentrnof the bridge responses suggests that a careful selection of isolation bearing’s model consideringrnrheology properties is vital for rational prediction of the seismic response of isolated bridge systems,rnparticularly at low temperature condition.
机译：通过进行非线性动力分析，重新评估铅橡胶轴承（LRB）建模对隔离桥地震响应的影响。在室温（+ 23℃）和低温（-rn20℃）条件下的实验测量中已经确定了用于仿真的模型参数。为了比较，我们考虑了三种不同的隔离轴承（LRBs）分析模型进行比较。日本道路协会（JRA）和美国国家公路和运输官员协会（AASHTO）指定的常规双线性模型，流变模型和简化模型。通用流变模型考虑了观察到的非线性弹塑性和粘度引起的速率依赖性行为，而简化版本消除了粘度效应。在分析中采用三线性滞后模型来表示混凝土桥墩的非线性力学行为。开发了一种求解流变模型一阶控制微分方程的数值算法，以将所提出的模型实现为非线性动力学分析软件。在分析中采用了JRA推荐的六种不同的2级地震地震动，并沿纵向应用。通过对混凝土隔震系统的不同建模技术，通过比较混凝土墩中塑料铰链的旋转响应和轴承顶部的剪应变响应，研究了隔震桥梁系统的地震响应。最后，对桥梁响应的比较评估表明，考虑流变特性对隔震支座模型的仔细选择对于合理预测隔震桥梁系统的地震响应至关重要，特别是在低温条件下。

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