论文部分内容阅读
该文采用大型有限元分析软件Ansys对独塔斜拉-自锚式悬索组合体系桥吊杆锚固区建立计算模型,分析了该桥在最不利荷载组合下,吊杆力最大区段对应的锚固区各构件的应力与变形情况。分析结果表明:采用该构造形式锚固区整体刚度不足,构件最大位移达3.7mm;在钢板焊接处出现了应力集中情况,应力值大于设计允许值。根据分析结果确定了锚固区整体刚度及钢锚梁与横隔板焊接处局部应力控制成为进一步优化设计的控制因素。对此该文初步提出了两种设计优化方案,即改变横隔板厚度和对横隔板增加横向与纵向肋条,以此提高横隔板刚度,改善构件应力集中现象。
In this paper, a large-scale finite element analysis software Ansys is used to establish the calculation model for the anchorage zone of a single tower cable-stayed-self-anchored suspension cable suspension bridge system. The maximum load corresponding to the boom force under the most unfavorable load combination is analyzed. Stress and deformation of each component in anchorage zone. The analysis results show that the overall stiffness of the anchorage zone is not enough and the maximum displacement of the component reaches 3.7mm. The stress concentration in the welded part of the steel plate occurs and the stress value is larger than the design allowable value. According to the results of the analysis, the overall stiffness of the anchorage zone and the local stress control at the weld of the steel anchor beam and diaphragm were determined to be the control factors for further optimization. In this paper, two kinds of design optimization schemes are preliminarily proposed, that is, changing the thickness of the diaphragm and adding transverse and longitudinal ribs to the diaphragm so as to increase the rigidity of the diaphragm and improve the stress concentration of the member.