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基于LS-DYNA公路桥梁车桥耦合振动模型

, PP. 40-45

Keywords: 桥梁工程,车桥相互作用,LS-DYNA,有限元模型,动力响应

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Abstract:

基于LS-DYNA程序,采用线弹性的橡胶及钢材模拟车轮并定义轮胎内气压,运用转动约束关节和圆柱形约束关节实现车轮转动特性;结合车辆悬架系统动力特性,运用弹簧阻尼单元及梁单元仿真实现悬架动力特性;调整质量单元的大小及分布,实现车体质量分布与实际一致。以某三轴重型车辆为例,建立了用于研究车桥耦合振动响应的精细车辆模型。对比车辆有限元模型的轴载、自振频率理论值与实测值,验证车辆模型的有效性。以某一简支梁桥为例,采用LS-DYNA有限元模拟和MATLAB数值分析移动弹簧-质量-阻尼振动系统,对比研究车辆匀速通过简支梁桥时,各片梁的振动响应。研究结果表明,运用LS-DYNA精细有限元模型能准确分析车桥耦合振动响应,但计算工作量大。

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