模态分析塔科马大桥Workshop1July10,2007?2007ANSYS,Inc.Allrightsreserved.ANSYS,Inc.ProprietaryInventory#002406WS1-1Workshop1–目的WorkshopSupplementWorkbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamicsWorkbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamics?目的在于计算某一悬索桥模型的振动特性–塔科马海峡大桥，又称为“GallopingGertie”，因其在1940年出任意外的倒塌而出名。?在该实例中，首先对桥的模型进行分析，然后计算大桥的固有频率和固有振型。?在求解中，我们考虑到了结构的“预应力”，因为自重载荷预先作用于桥梁上而导致拉索产生了预拉力，从而增加了整体刚度。?然后通过谐响应分析来模拟暴风导致桥倒塌以及漩涡脱落现象。July10,2007?2007ANSYS,Inc.Allrightsreserved.ANSYS,Inc.ProprietaryInventory#002406WS1-2Workbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamicsWorkbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamicsWorkshopSupplement?在桥梁四个桥塔塔底施加固定约束。?在桥梁的两端约束竖直和横向位移。Workshop1–假设?所有边界条件施加在点上。July10,2007?2007ANSYS,Inc.Allrightsreserved.ANSYS,Inc.ProprietaryInventory#002406WS1-3Workshop1–起始页WorkshopSupplementWorkbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamicsWorkbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamics?从“WorkBenchProjectLauncher”点击“Simulation”。–?如果进入“Simulation”，点击>File>New基于培训，可以点击“No:donotsaveanyitems”?点击“>Geometry>FromFile…”,从相应文件夹中打开几何模型文件gallop_scale.agdbJuly10,2007?2007ANSYS,Inc.Allrightsreserved.ANSYS,Inc.ProprietaryInventory#002406WS1-4Workshop1–设置WorkshopSupplementWorkbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamicsWorkbench-SimulationDynamicsWorkbench-SimulationDynamicsSimulationDynamicsSimulationDynamics1.当导入几何模型之后，从“MapofAnalysisTypes”选择“StaticStructural”。–我们首先进行静力分析，为预应力模态分析做准备。2.3.点击OK确认单位系统“Units>Metric(m,kg,N…)132July10,2007?2007ANSYS,Inc.Allrightsreserved.ANSYS,Inc.ProprietaryInventory#002406WS1-5Workshop1–前处理WorkshopSupplementWorkbench-SimulationDynamicsWorkbench-Simul