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以清远北江四桥为工程背景,针对该桥索梁锚固区钢锚箱的特殊构造形式,采用ANSYS有限元分析软件板壳单元建立了索梁锚固区的三维有限元分析模型,对钢锚箱在最不利荷载组合下的受力性能进行了研究。分析表明钢锚箱主要构件及钢箱腹板的应力及变形均满足受力要求,但抗剪板倒角处及抗剪板与腹板结合处出现了较大的应力集中。在上述分析的基础上,提出了改善索梁锚固区受力性能的构造措施,并通过变形及应力对比分析进行了验证。
Taking Qingyuan Beijiang Fourth Bridge as the engineering background, a three-dimensional finite element analysis model of cable-girder anchorage zone was established by using the finite element analysis software ANSYS plate-shell element in view of the special structure of steel anchor box in the anchorage zone. The force performance under the most unfavorable load combination was studied. The analysis shows that the stress and deformation of the main components of the steel anchor box and the steel box web satisfy the stress requirements, but the stress concentration at the chamfer of the anti-shear plate and the joint of the shear plate and the web appears. Based on the above analysis, the structural measures to improve the mechanical properties of the anchorage zone of the cable-stayed bridge are proposed and verified by the comparison of deformation and stress.