为辅助桥梁倒塌事故责任鉴定,系统研究了桥梁倒塌过程分析有限元后处理相关关键技术,具体包括以下内容:(1)设计了基于面向对象思想自主开发的有限元后处理程序总体架构;(2)研究并编程实现了大文件分块读取、单元生死显示等后处理关键技术;(3)在简化处理总体应力磨平方法的基础上,研究了实体单元高斯点应力外推节点应力算法;(4)用C#和VS.net 2005开发了有限元计算结果及重要性评价云图显示程序;(5)分别在双跨石拱桥模型、悬臂箱梁模型和堤溪沱江大桥倒塌过程分析中对上述后处理关键技术进行了应用和验证。研究结果表明:(1)用开发的后处理系统进行有限元后处理计算是可行的,其结果与Abaqus和SM-Solver计算结果基本一致;(2)采用分块读取有限元计算结果大文件可以有效提高桥梁倒塌过程显示的流畅性;(3)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。 In order to assist the responsibility appraisal of the collapse accident of the bridge, the key technologies related to finite element post-processing of the bridge collapse analysis are systematically studied, including the following contents: (1) The overall structure of finite element postprocessing program based on object- ) Research and programming to achieve a large file block read, the unit of life and death display and other key technologies; (3) simplify the overall stress leveling method based on the study of the physical unit of Gaussian point stress extrapolation node stress algorithm; (4) The finite element calculation results and the appraising cloud image display program were developed by using C # and VS.net 2005. (5) In the analysis of the double-span stone arch bridge model, the cantilever box girder model and the collapse process of the embankment bridge, After-treatment of key technologies have been applied and verified. The results show that: (1) Finite element post-processing calculation is feasible with the developed post-processing system, and the results are basically the same as Abaqus and SM-Solver; (2) Can effectively improve the fluency of the bridge collapse process; (3) unit life and death display module can dynamically demonstrate the process of the collapse of the bridge to provide technical support for the accident analysis.