覆土厚度对框架式地道桥受力性能影响  

Effect Analysis of Top Plate Covering Soil Thickness on Mechanical Behavior of Frame Bridges

作　　者：董锐[1] 李狄钦 詹刚毅 翁祥颖 黄福云[1] DONG Rui;LI Diqin;ZHAN Gangyi;WENG Xiangying;HUANG Fuyun(College of Civil Engineering,Fuzhou University,Fuzhou Fujian 350108,China;Nanchang Railway Survey and Design Institute Co.Ltd.,Nanchang Jiangxi 330000,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]南昌铁路勘测设计院有限责任公司,江西南昌330000

出　　处：《新疆大学学报（自然科学版）》2020年第1期94-101,共8页Journal of Xinjiang University(Natural Science Edition)

基　　金：可持续与创新桥梁福建省高校工程研究中心开放基金(SIBERC201805);山区桥梁与隧道工程国家重点实验室培育基地开放课题(CQSLBF-Y15-11).

摘　　要：为研究覆土厚度对框架式地道桥受力性能的影响,本文采用理论分析和有限元模拟的方法对某框架桥在施工阶段和成桥阶段多种荷载工况下的变形和应力进行了分析比较.结果表明:(1)随着顶板覆土厚度增加,框架桥最大竖向变形和最大应力均有变小的趋势,但最大横向变形和最大轴向变形基本没有变化;(2)降温是框架桥最大竖向变形的最不利工况,升温是框架桥最大应力、最大横向和轴向变形的最不利工况;(3)施工阶段,中间腹板最大应力随顶板覆土厚度的增加而增大,但增长的幅度很小.降温工况是此时的最不利工况;(4)温度作用是影响框架桥变形和应力的最主要因素,顶板覆土厚度的影响相对较小,在满足列车荷载有效分布厚度的前提下,不必着重考虑.In order to study the influence of top plate covering soil thickness on mechanical behavior of frame bridges,the deformation and stress of a frame bridge under various load conditions are analyzed through theoretical analysis and finite element simulation in detail in this paper.Research results shown,(1)The maximum vertical deformation and maximum stress of the frame bridge are decreased with the increase of the covering soil thickness,but the maximum transverse and axial deformation basically remain unchanged.(2)Temperature dropping load combination is the most disadvantageous condition for the maximum vertical deformation of the frame bridge,and temperature rising load combination is the most disadvantageous condition for the maximum stress,maximum transverse and axial deformation of the frame bridge.(3)In the construction stage,the maximum stress of the middle web are increased with the increase of the covering soil thickness,but the increase ratio is very small.Temperature dropping load combination is the most disadvantageous condition at this stage.(4)Temperature effect is the most important factor affecting the deformation and stress of the frame bridge.In this stage,the influence of the top plate covering soil thickness to the frame bridge is relatively small,and it is unnecessary to consider it when the effective distribution thickness of train load is satisfied.

关 键 词：框架式地道桥 覆土厚度 有限单元法 施工阶段 成桥阶段 变形 应力 

分 类 号：TU997[建筑科学—市政工程]