城际铁路三塔斜拉桥刚度参数分析及应用  

Stiffness Parameter Analysis and Application of Three-pylon Cable-stayed Bridge on Intercity Railway

作　　者：吕存杰[1] LV Cunjie(China Railway First Survey and Design Institute Group Co.Ltd,Xi'an,Shaanxi 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2020年第8期59-64,共6页Journal of Railway Engineering Society

基　　金：中国铁建股份有限公司科技开发项目(17-C36)。

摘　　要：研究目的:三塔双主跨斜拉桥相较常规大跨斜拉桥而言,具有一定的经济优势,但也存在竖向刚度低、拉索疲劳应力幅高等缺点,目前在铁路上尚未得到广泛应用。本文以广佛江珠城际(72+96+336+336+96+72)m三塔斜拉桥为背景,对影响刚度的结构参数进行分析,进而拟出合理结构尺寸,并对结构进行力学计算,得出在城际铁路中推广三塔斜拉桥的可行性。研究结论:(1)竖向刚度随主梁高度增加而增大,但增幅低于梁高增幅,主梁采用钢箱梁时,通过增加主梁梁高来提高竖向刚度会较不经济,综合考虑后梁高取4.5 m;(2)索塔高度取96 m,塔柱截面取7 m×4 m;(3)斜拉索采用双索面扇形空间布置,索塔锚固间距2 m,斜拉索在主梁上锚固间距为8 m,斜拉索与主梁夹角为30.3°~78.3°;(4)辅助墩位置选择距离主塔96 m;(5)三塔斜拉桥在城际铁路荷载作用下受力良好,具备推广的价值。Research purposes:The three-pylon double-main-span cable-stayed bridge has certain economic advantages over conventional long-span cable-stayed bridges,but it also has shortcomings such as low vertical stiffness and high fatigue stress amplitude of cable.Therefore it has not been widely used in railways.Taking the GuangzhouFoshan-Jiangmen-Zhuhai Intercity Railway(72+96+336+336+96+72)m three-pylon cable-stayed bridge as the background,the structural parameters that affect the stiffness are analyzed,and then a reasonable structural size is drawn up,as well as the mechanical calculation of the structure is made in order to find out the feasibility of popularizing the three-pylon cable-stayed bridge in the intercity railway.Research conclusions:(1)The vertical stiffness increases with the height of the main girder,but this increase is lower than the increase in girder height.When the girder adopts a steel box girder,it is less economical to increase the vertical stiffness by increasing the height of the girder.After comprehensive consideration,the height of the girder is taken 4.5 m.(2)The height of the cable tower is 96 m,and the cross-section of the tower pillar is taken 7 m×4 m.(3)The stay cables are arranged in a fan-shaped space with double cable planes.The anchorage distance of the cable tower is 2 m,the anchorage distance of the stay cable on the girder is 8 m,and the angle between the stay cable and the girder is30.3°~78.3°.(4)The location of the auxiliary pier is 96 m away from the main tower.(5)The three-pylon cable-stayed bridge bears well under the load of the intercity railway and has the value of promotion.

关 键 词：城际铁路 三塔斜拉桥 竖向刚度 结构尺寸 分析计算 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]