某拱承斜拉桥设计方案探讨-《高速铁路技术》

文章信息/Info

Title:: Discussion on Design Schemes of A Arch-supported Cable-stayed Bridge

Author(s):: WANG Cong; ZENG Yongping; China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: arch-supported cable-stayed bridge|residual creep|camber|beam ends|lateral relative displacement

摘要:: 某高速铁路在小角度跨越既有高速公路时，主桥采用（32+160+32） m拱承斜拉桥结构，拱式桥塔分立高速公路两侧，采用全飘浮体系，于辅助墩及边墩墩顶设置支座。通过复核验算，原设计存在主梁跨中残余徐变上拱度、梁端钢轨横向相对位移超限、高速铁路正线限界上方拱圈接头处的高强螺栓断裂后对高速行车有重大安全隐患三大问题。文章分析了问题产生的原因，并提出了具体的优化建议，确保了结构安全，可为类似结构工程提供参考。

Abstract:: A (32+160+32) m arch-supported cable-stayed bridge structure is adopted for main bridge of a high-speed railway crossing existing expressway at a small angle, and the arch bridge towers are separated on both sides of the expressway. A full floating system is adopted and supports are installed on the top of auxiliary piers and side piers. Through re-check and calculation, it is clearly pointed out that the original designs have three major problems:the residual creep in the middle span of the main girder and the lateral relative displacements of the rail at the beam ends are all overrun, and the high-strength bolts fracture at the arch joints above the limits of the high-speed railway main lines, which may cause major safety hazards to high-speed driving. The causes of the problems are analyzed in the paper and specific optimization suggestions are proposed to ensure the safety of the structure, and it provides references for similar structural works.