一种新型自锚式悬索桥锚固构造设计与受力分析

Design and stress analysis of a new type self-anchored suspension bridge′s anchorage

抚顺市万新大桥是一座主跨160m的自锚式混凝土悬索桥,其主缆采用连续的镀锌钢丝绳绕过梁端,并使两股主缆连续为闭合环形,使得梁端受力复杂.应用ANSYS程序,采用空间三维实体单元对锚固跨在施工及成桥状态的2种不同工况进行了应力分析计算,获得了施工状态无顶板、无纵向预应力筋,无顶板、有纵向预应力筋和有顶板、有纵向预应力筋情况下锚固跨局部应力的大小和分布规律,并根据分析结果调整了锚固构造的预应力筋,使其受力满足设计要求,为该桥设计提供了有用的参考依据.计算结果也可为其他同类桥梁的锚固跨设计提供参考.

Fushun Wanxin Bridge is a concrete self-anchored suspension bridge with a span of 160 m. The cable is a continuous galvanized steel rope around the end of beam, and the two cables become a closed loop, which makes the structure and stress of anchorage span complicated. FEM was used to analyze anchorage span stress during construction and service stage by ANSYS′s solid element. Then the local stress and distributional rule of anchorage were obtained in the following cases: without top plate and prestressed tendon, without top plate but with prestressed tendon and with top plate and prestressed tendon. According to the analysis results, the longitudinal tendons of anchorage span were added to meet the needs of stress. The calculated results provide the foundation for design and the reference for the design of similar bridge′s anchorage.