跨座式单轨交通刚构体系钢轨道梁桥设计参数影响性分析  

Analysis of Influence of Design Parameters of Steel Track Beam Bridge of Straddle-Type Single Track Rigid-Frame System

作　　者：李盼到[1] 王新山[2] 刘一平[1] 程京伟 

机构地区：[1]北京市市政工程设计研究总院有限公司,北京100082 [2]大连理工大学桥梁工程研究所,辽宁大连116024

出　　处：《世界桥梁》2016年第1期64-69,共6页World Bridges

摘　　要：刚构体系钢轨道梁桥的主梁中支点应力和桥墩配筋率对结构受力及工程造价影响较大,为掌握设计参数对主梁中支点应力和桥墩配筋率的影响程度,采用有限元软件建立3种典型桥梁(等截面3×25m连续、变截面单跨40m门架式及变截面x+80m+x连续刚构体系钢轨道梁桥桥型方案)计算模型,分别计算不同梁高、墩柱尺寸、平曲线半径等参数下主梁中支点应力和桥墩配筋率的变化规律。结果表明:针对主梁中支点应力和桥墩配筋率的影响,等截面连续刚构体系钢轨道梁桥对主梁高度及平曲线半径较为敏感,变截面单跨门架式刚构体系钢轨道梁桥对桥墩尺寸及平曲线半径较为敏感,边跨跨度、中支点梁高、桥墩尺寸及平曲线半径对变截面连续刚构体系钢轨道梁桥的主梁中支点应力和桥墩配筋率的影响较大。In the steel track beam bridge of rigid-frame system,the intermediate support stress in the main beam and the amount of reinforcement in the piers exert substantial influence on the load bearing capacity of the structure as well as the costs of the project.To examine the influential degree of design parameters on the intermediate support stress in the main beam and the amount of reinforcement in the piers,the finite element software was used to establish the calculating models of three typical types of bridges,including the steel track beam bridges of continuous rigid-frame system respectively with span arrangement of 3×25 mand with constant cross sections,a 40 m long single span portal frame structure with variable cross sections and a x＋80 m＋xstructure with variable cross sections,to calculate the variation of intermediate support stress in the main beam and the amount of reinforcement in piers in the contexts of different beam depth,pier column dimension and plan curvature radius.The results of the calculation demonstrate that when the influence of intermediate support stress in the main beam and the amount of reinforcement in piers is concerned,the steel track beam bridge of continuous rigid-frame system and with constant cross sections is found more sensitive to the variation of main beam depth and plan curvature radius,whereas the one of rigid-frame system with single span portal frame structure and variable cross sections is prone to the changes of pier dimension and plan curvature radius.And for the steel track beam bridge of continuous rigid-frame system with variable cross sections,the side span length,beam depth at the intermediate support,pier dimension and plan curvature radius are proved the dominant influential factors for the intermediate support stress in the main beam and the amount of reinforcement in piers.

关 键 词：跨座式单轨交通 刚构体系 钢轨道梁 等截面 变截面 门架式 设计参数 有限元法 桥梁设计 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]