跨度128m铁路简支系杆拱桥设计及吊杆优化分析  

Design of 128 m-span Simply Supported Tied Arch Bridge and Suspender Optimization Analysis

作　　者：刘兴文[1] 

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：《铁道标准设计》2016年第7期103-107,共5页Railway Standard Design

基　　金：国家自然科学基金(51368036)

摘　　要：为研究恒载及活载在简支系杆拱桥结构中的分布,介绍1座128 m铁路简支系杆拱桥的设计,探讨拱脚截面有限元模拟时的处理方法,建立该桥的有限元分析模型,对比分析吊杆刚度对结构在恒载和活载下受力的影响。研究结论为:吊杆刚度对系杆拱桥的荷载分配及梁、拱应力有着较大的影响,且在吊杆刚度较小时影响显著,影响率随着吊杆刚度的增加而减小;对于系杆拱桥,吊杆起着重要的联系作用,设计时需要根据梁和拱的承载能力进行整体合理设计。In order to study the load ( both dead load and live load) distribution of simply supported tied arch bridge, the design of a 128m railway simply supported tied arch bridge is referenced to study the finite element simulation of arch foot. A finite element analytical model is established to analyze the effect of suspender stiffness on the structure performance under dead load and live load. The results show that the suspender stiffness imposes great impact on the load distribution and the stress of the beam and arch of the tied arch bridge. When the suspender stiffness is small, and the influence rate decreases with the increase of suspender stiffness. Under this context, the suspender plays an important connecting role and the tied arch bridge should be appropriately designed according the bearing capacity of the beam and arch.

关 键 词：铁路桥 系杆拱桥 吊杆 荷载分配 有限元模型 优化设计 

分 类 号：U448.225[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]