荆岳长江公路大桥索塔锚固钢锚梁结构体系分析  

Analysis of Steel Anchor Beam Structural System of Anchorage in Pylon of Jingyue Changjiang River Highway Bridge

作　　者：张家元[1] 丁望星[1] 朱世峰[2] 

机构地区：[1]湖北省交通规划设计院,湖北武汉430051 [2]中铁大桥局集团桥科院有限公司,湖北武汉430034

出　　处：《桥梁建设》2015年第2期89-93,共5页Bridge Construction

摘　　要：荆岳长江公路大桥主桥为主跨816m的双塔不对称混合梁斜拉桥,在成桥状态下,索塔锚固采用两端固定的钢锚梁结构体系。为研究钢锚梁平衡斜拉索索力的作用,验证超静定结构体系钢锚梁的合理性,采用ANSYS软件建立索塔锚固区有限元模型,分析钢锚梁施工过程中2种不同的支承体系方案,并通过足尺模型试验研究钢锚梁对斜拉索索力的分配比例。结果表明:斜拉索初张时采用边跨固定、中跨滑动,斜拉索张拉后两端固定结构体系的钢锚梁承担了斜拉索索力水平分力的83.7%,钢锚梁与塔壁对索力水平分力的分配比例为8∶2,该体系能够发挥钢锚梁平衡斜拉索索力的作用,且结构可靠度高。The main bridge of Jingyue Changjiang River Highway Bridge is a asymmetric span hybrid girder cable‐stayed bridge with double pylons and with a main span of 816 m .The anchor‐age in a pylon of the bridge in completion state is of the steel anchor beam structural system with its two ends being fixed .To study the function of the anchor beam balancing the stay cable forces and to verify the rationality of the anchor beam of the statically indeterminate structural system , the software ANSYS was used to set up the finite element model for the anchorage in the pylon , 2 different support schemes adopted for construction of the anchor beam were analyzed and the ra‐tios of the stay cable forces distributed by the anchor beam were studied by means of the full‐scale model tests .The results of the study show that the anchor beam using the structural system with its side span end being fixed ,its central span end being slide at the time of initial tensioning of the stay cables and with its two ends being fixed after tensioning of the stay cables can bear 83 .7%horizontal component of the stay cable forces and the ratio of the horizontal component distributed by the anchor beam and pylon wall is 8∶2 ,proving that the anchor beam can play the role of bal‐ancing the stay cable forces and is also structurally highly reliable .

关 键 词：斜拉桥 索塔锚固 钢锚梁 结构体系 有限元法 受力分析 模型试验 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]