基于OpenSees大应变单元的拱桥倒塌过程模拟

发布时间：2018-05-06 08:16

本文选题：OpenSees + 大应变单元　；参考：《防灾减灾工程学报》2014年03期

【摘要】：系统研究了基于OpenSees的圬工拱桥倒塌过程模拟,包括以下内容:①比较了小应变单元和大应变单元在桥梁倒塌模拟应用中的优劣;②通过添加质量矩阵,二次开发了TLFD8nBrick单元,并验证了其在动力计算中的正确性;③采用TLFD8nBrick单元,完成了堤溪沱江大桥倒塌过程模拟;④研究了基于OpenSees的倒塌过程有限元分析的计算结果和单元生死显示后处理技术。研究结果表明:①采用小应变单元会导致计算结果失真,无法模拟倒塌过程中的几何非线性问题;②经过二次开发后的TLFD8nBrick单元可用于结构动力计算,能实现桥梁结构的倒塌过程模拟;③用C#和VS.net 2005开发的有限元程序计算结果与Abaqus基本一致,以云图显示效率较高;④单元生死显示模块可以动态地展现桥梁倒塌过程,为事故原因分析提供技术支持。
[Abstract]:The collapse process simulation of masonry arch bridge based on OpenSees is studied systematically, including the following contents: 1. The advantages and disadvantages of small strain element and large strain element in bridge collapse simulation are compared. Secondly, the TLFD8nBrick element is developed twice by adding mass matrix. The correctness of this method in dynamic calculation is verified. The collapse process simulation of Tixi Tuojiang Bridge is completed by using TLFD8nBrick element. The finite element analysis results of collapse process based on OpenSees and the post-processing technology of element life and death display are studied. The research results show that the small strain element will cause distortion of the calculation results, and the geometric nonlinear problem during collapse can not be simulated. The second developed TLFD8nBrick element can be used in the dynamic calculation of structures. The finite element program developed by C # and VS.net 2005 can be used to simulate the collapse process of bridge structure. The calculation results are basically consistent with that of Abaqus. The life and death module of 4 elements with high efficiency can dynamically show the collapse process of bridge. Provide technical support for accident cause analysis.
【作者单位】：浙江工业大学建筑工程学院;长兴县交通运输局;
【基金】：浙江省自然科学基金项目(LY13E080014) 交通部西部交通建设科技基金项目(200831822343) 浙江省省级重点创新团队课题(2012R10035-12)资助
【分类号】：U448.22;U447

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