桥梁地震碰撞分析中不同接触单元模型的对比分析

发布时间：2018-01-16 18:41

本文关键词：桥梁地震碰撞分析中不同接触单元模型的对比分析　出处：《工程力学》2014年03期 　论文类型：期刊论文

【摘要】：地震时邻梁间的碰撞是引起桥梁局部损坏甚至落梁的主要原因。为合理分析桥梁的地震碰撞响应,基于所开发的结构精细化模拟分析平台FENAP,对比分析了桥梁地震碰撞分析中不同接触单元模型的计算精度和适用条件。在FENAP平台上引入线性弹簧、Kelvin-Voigt、Hertz和Jan-Hertz-damp等四种接触单元模型,建立了结构地震碰撞分析平台,并通过数值验证以及对正弦波和地震动激励下的模型试验的数值分析,对比分析了不同接触单元模型对结构碰撞响应的影响。研究表明:所建立的结构地震碰撞分析平台具有较高的计算精度和效率;在四种接触单元模型中,Kelvin-Voigt和Jan-Hertz-damp模型的计算精度和适用性更高,而线性弹簧和Hertz模型,由于未考虑碰撞过程中的能量损失,仅适用于恢复系数较高的近似弹性碰撞情况。
[Abstract]:The collision between adjacent beams during earthquake is the main cause of local damage and even fall of the bridge. In order to reasonably analyze the seismic impact response of the bridge, the detailed structural simulation platform FENAP is developed. The calculation accuracy and applicable conditions of different contact element models in bridge seismic collision analysis are compared and analyzed. The linear spring Kelvin-Voigt is introduced on FENAP platform. Four contact element models, such as Hertz and Jan-Hertz-damp, have been established for structural seismic collision analysis. Through numerical verification and numerical analysis of the model test under sine wave and ground motion excitation. The effects of different contact element models on the structural impact response are compared and analyzed. The results show that the platform has high calculation accuracy and efficiency. Among the four contact element models, the Kelvin-Voigt and Jan-Hertz-damp models are more accurate and applicable, while the linear spring and Hertz models are more accurate. Because the energy loss in the collision process is not considered, it is only suitable for the approximate elastic collision with higher recovery coefficient.
【作者单位】：天津大学滨海土木工程结构与安全教育部重点实验室;铁道第三勘察设计院集团有限公司;
【基金】：国家重点基础研究发展“973”计划项目(2011CB013603) 国家自然科学基金项目(91315301)
【分类号】：U442.55
【正文快照】： 桥梁震害表明[1],相邻桥梁构件和结构间的碰撞是引起桥梁局部损坏甚至落梁破坏的主要原因,受到设计和研究人员的广泛关注。碰撞是一种高度非线性力学现象,撞击过程在较短时间内产生巨大冲量作用,引发接触点的塑性变形、局部开裂、压碎及相互摩擦等力学行为。要揭示碰撞机理及

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