万新大桥梁端滑动索鞍设计与受力分析

Design and Stress Analysis of Wanxin Suspension Bridge′s Beam-Sliding Saddle

抚顺市万新大桥是一座主跨160 m的混凝土自锚式悬索桥.由于受两端连接线和设计洪水位的限制,采用了独特的锚固构造型式,每侧梁端各设置了2个滑动索鞍和一个固定索鞍,其主缆采用连续的镀锌钢丝绳绕过全桥10个索鞍,并使两股主缆连续为闭合环形,通过梁端索鞍将主缆力传递于主梁,使锚固构造高度满足了桥下净空需要.文中应用AN SY S程序采用空间三维实体单元对梁端滑动索鞍进行了受力分析,并介绍了梁端滑动索鞍的施工安装方法.

Fushun Wanxin Bridge is a concrete self-anchored suspension bridge whose main span is 160m. Because the level of approach road and peak discharge of the river necessitates a maximum clear height of 3.76m for the anchor, the unique anchor is applied. Two sliding saddle and one fixed saddle are set at the end of the beam. Thus there are totally ten saddles after pulsing four sliding saddles on the top of the tower. The cables are made up of a continuous galvanized steel rope around all saddles, and the two cables become a closed loop. So the heavy strength of main cable are transferred to the stiffening girder through the saddles on both ends of the beam. This means the dimension of anchor decreases to 3.65m, which just meets the demand of clear space. FEM is used to analyze beam-sliding saddle＇s stress by ANSYS＇s solid element. The calculation result provides the foundation for optimal design. The method of installation is introduced in detail.