不等横向联结系对钢-混组合梁桥荷载横向分布的影响研究  

Study on the effect of unequal transverse bracing systems on the transverse load distribution of steel-concrete composite bridges

作　　者：李立峰[1] 程子涵 冯威 刘新华[3] LI Lifeng;CHENG Zihan;FENG Wei;LIU Xinhua(College of Civil Engineering,Hunan University,Changsha 410082,China;Xi’an Highway Institute of Shaanxi Province,Xi’an 710065,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]西安公路研究院,陕西西安710065 [3]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《铁道科学与工程学报》2020年第11期2832-2839,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51978257);陕西省交通厅科研课题(17-19K);云南省交通厅科研课题(2017-17)。

摘　　要：目前,中等跨径窄幅钢-混组合梁桥常采用“两片组合梁成榀预制、整体吊装”的施工工艺,榀内横向联结密布、与主梁一起预制,而榀间横向联结在现场安装。为减少现场施工,榀间横向联结设置较少、与榀内横向联结数量不对等。为研究这种布置对桥梁荷载横向分布的影响以及传统理论方法的适用性,结合一座跨径40 m的组合桥,建立空间实体有限元分析模型,选取不同的桥面板厚度情况,以横向联结的数量与刚度为参数进行分析,获得了荷载横向分布影响规律。基于有限元结果,对传统的刚性横梁法、刚接梁法等进行了适用性评价。研究结果表明:榀内横向联结数量足够、榀间仅设置端部和跨中横向联结时,继续增加榀间横向联结对荷载横向分布影响较小,故可仅在梁端和跨中设置榀间横向联结;横向联结的刚度对荷载横向分布影响甚小;传统理论方法获得的荷载横向分布系数均大于有限元结果,偏于安全。At present,the construction technology that using double beams as a whole for hoisting is generally used in medium-span narrow steel-concrete composite beam bridges.The internal transverse braces are densely packed and prefabricated together with composite beams,while the external transverse braces are usually fewer to reduce site construction.To study the influence of this arrangement on the transverse load distribution and the applicability of conventional methods,a finite-element method was used to create several different models with a varying quantity and stiffness of internal and external transverse braces based on a 40 m steel-concrete composite bridge with different slab heights.Based on the FE analysis results,the applicability of the conventional rigid transverse beam method and rigid-jointed beam method were evaluated.These results are as follows.When the internal transverse braces are sufficient and external transverse braces are set up at the midspan and the ends,the increase of transverse braces has a small effect on the transverse load distribution;the stiffness of braces has limited effect on the transverse load distribution.The transverse load transverse distribution factors calculated through the conventional methods are greater than the FE analysis results,which is conservative.

关 键 词：桥梁工程 钢-混组合梁 横向联结系 荷载横向分布 有限元分析 

分 类 号：U448.2166[建筑科学—桥梁与隧道工程]