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以平顶山建设路立交桥——刚性索自锚式悬索桥为工程实例,分别运用有限元计算程序Midas/Civil和Ansys建立其整体计算模型和边跨主缆锚固区梁段的局部计算模型,对锚固区进行空间局部应力分析,研究其受力状态,得出结论:箱梁绝大部分位置的应力均在规范允许范围内,且主梁压应力储备充足;箱梁主梁梁段切开截面端与顶板交接处的正中心位置顺桥向正应力和最大主拉应力均较大,局部超过规范要求,建议在桥梁设计和施工过程中考虑在边跨顶板中心位置配置压重或顶板纵向预应力钢束,防止箱梁顶板开裂;主缆锚固位置处的最大主压应力较大,锚固位置附近的最大主拉应力超限,需要在锚固位置附近局部加强或改变锚固方式;所有倒角部位在施工时应尽量平顺,避免应力集中。
Taking the Pingdingshan Jianshe Road overpass - rigid cable self-anchored suspension bridge as an example, the overall calculation model and the local calculation models of the beam sections in the anchorage zone of the main cable are established respectively by the finite element program Midas / Civil and Ansys. The analysis of local stress in space and the study of the stress state of the box girder concluded that the stress of most of the box girders is within the allowable range of the codes and the compressive stress of the main girder is sufficient. At the center of the roof junction, the normal stress and the maximum principal tensile stress along the bridge are larger than the specifications, and it is suggested that the pressure should be placed at the center of the spanned roof or the longitudinal prestressing steel of the roof during the design and construction of the bridge Beam to prevent cracking of roof of box girder. The maximum principal compressive stress at the anchorage position of the main cable is larger, the maximum principal tensile stress near the anchoring position is beyond the limit, and the anchoring mode needs to be strengthened or changed locally in the vicinity of the anchoring position. Should be as smooth as possible to avoid stress concentration.