变截面波形钢腹板PC组合连续箱梁横向受力性能研究  

Research on Transverse Load Bearing Behavior of Variable-Cross-Section PC Composite Continuous Box Girder with Corrugated Steel Webs

作　　者：赵品 荣学亮 王涛 卜建清 ZHAO Pin;RONG Xue-liang;WANG Tao;BU Jian-qing(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Road and Railway Engineering Security Joint-Constructed by Hebei Province and Ministry of Education,Shijiazhuang 050043,China)

机构地区：[1]省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043 [3]道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《桥梁建设》2023年第2期90-97,共8页Bridge Construction

基　　金：国家自然科学基金项目(51508348);京津冀协同创新共同体建设专项项目(20547601D);河北省自然科学基金项目(E2017210191)。

摘　　要：为研究变截面波形钢腹板PC组合连续箱梁的横向内力分布规律及有效分布宽度,以某连续梁桥为背景,设计、制作一片三跨变截面波形钢腹板PC组合连续箱梁的缩尺模型,通过试验与有限元模拟相结合的方法进行试验梁横向内力研究。按分级加载方式分别在试验梁中跨跨中与边跨跨中进行单点与双点加载,并采用Abaqus软件建立试验梁有限元模型,分析各工况下跨中截面的横向内力,以及中支点、横隔板对横向内力分布的影响;最后推导有效分布宽度计算公式,并与现行桥规值对比。结果表明:沿中线单点加载时,试验梁的横向应力由中腹板位置的顶板向两侧逐渐递减,偏载时两侧边腹板的横向应力差值较大,偏载工况下畸变与横向翘曲现象较明显,可采用增大腹板线刚度或增加横隔板厚度等措施进行改善;中支点对横向应力的分布具有较大的影响,工程应用应考虑中支点的影响;设置横隔板对抵抗跨中横向负弯矩具有较好的效果,横隔板处顶板横向应力明显减小;与有效分布宽度试验值相比,按桥规计算得到的有效分布宽度值较为保守,建议对现行桥规值进行适当修正。The study focuses on the transverse internal forces distribution and efficient distribution width in the PC continuous box girder with corrugated steel webs of variable cross-section.An existing continuous girder bridge is used as a case.A scaled model of three-span PC continuous girder with corrugated steel webs of variable cross-section was designed,which consists of one girder along bridge width.The transverse internal forces distribution in the test girder was examined by tests and numerical simulation.First,single-point and double-point loading were performed at the midspan of the central and side spans incrementally,and a finite element model of the test girder was built up in Abaqus to analyze the transverse internal forces in the midspan cross-section under different loading conditions,as well as the impact of intermediate supports and diaphragms on the distribution of transverse internal forces.As a result,the expression of effective distribution width was derived,and the calculated results were compared with the suggestions in the current codes.It is shown that when loaded at a single point along the central lline,the transverse stress in the test girder diminishes from the top plates at the central web to girder edges,under eccentric loads,the transverse stress difference between the two edge webs is big,while the distortion and transverse warping phenomenon are quite obvious,which is able to be alleviated by improving the linear stiffness of webs or thickening the diaphragms.The impact of intermediate supports on the transverse stress distribution is significant,which should be given concern in the engineering application.Compared with the test effective distribution width,the calculated width referencing the bridge specifications is a little conservative,therefore it is suggested to modify the given values in the current bridge codes.

关 键 词：组合梁 箱形梁 波形钢腹板 横向应力 有效分布宽度 模型试验 有限元法 

分 类 号：U448.213[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]