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系统研究可用于桥梁设计和桥梁倒塌过程分析的控制截面内力计算方法,该方法主要包括以下三个方面:首先研究有限元实体模型的截面剖分算法,提出并分析比较分块索引及相邻单元优先等算法的优劣;其次,在得到截面应力或截面节点力的基础上,进一步研究基于截面应力分布和截面节点力计算截面内力的方法;最后,分别在悬臂梁和圬工拱桥中对采用VS.NET及C#开发的截面内力计算系统进行了应用和验证,并分析圬工拱桥倒塌过程的内力发展。研究结果表明,分块索引相邻单元优先算法进行截面内力计算具有迭代次数少且计算速度快等特点;另外,采用等效节点力计算截面内力具有误差小、效率高和适用范围广等优点,可为桥梁抗倒塌研究提供有效的工具。
This method mainly includes the following three aspects: Firstly, the cross-sectioning algorithm of finite element solid model is studied, and the method of analyzing and comparing the block index and the adjacent units First of all, based on the cross-section stress or cross-section nodal force, the method of calculating cross-section internal force based on cross-section stress distribution and cross-section nodal force is further studied. Finally, VS.NET and C # developed cross-section internal force calculation system has been applied and verified, and analyzed the collapse process of artificial Gongqiao internal force development. The research results show that the method of calculating the internal force of the section by the algorithm of the adjacent element with block index has the characteristics of less iteration and faster calculation speed. In addition, the calculation of the internal force of section with the equivalent node force has the advantages of small error, high efficiency and wide range of application, It can provide an effective tool for anti-collapse of bridges.