摘要
为研究铁路钢箱混合梁斜拉桥钢-混结合段的受力特征及传力机理,以宁波铁路枢纽北环线甬江特大桥为背景,采用ANSYS有限元软件建立该桥钢-混结合段的三维有限元模型,分析钢-混结合段中钢壳体和混凝土的受力及轴力分配比例。结果表明:在计算荷载作用下,结构纵向受力板件均处于受压状态,应力水平较低;除承压板处发生突变外,其他部位变化平缓;混凝土各截面应力水平较低,截面发生一定的面外变形;承压板传力作用较大,结合段54%的轴力通过其传递,其余轴力通过PBL键和剪力钉传递;剪力键轴力传递比例呈两头大、中间小的马鞍形分布。
To investigate the force characteristics and force transfer mechanism of the steel and concrete joint section of railway hybrid box girder cable-stayed bridge, the Yongjiang River Bridge on the North Ring Link of Ningbo Railway Terminal was taken as an example. The soft- ware ANSYS was used to establish the three-dimensional finite element model for the steel and concrete joint section of the bridge, the force conditions and axial force distribution proportions of the steel shell and concrete in the joint section were analyzed. The results of the analysis demon- strate that under the action of the calculated load, the structural longitudinal force-bearing plates are all in the compression state and the structural stress levels are low. With the exception that the forces in the bearing plate change abruptly, the changing of the forces in other parts is gentle. The stress levels of the different sections of the concrete are low and certain out-of-plane deforma- tion of the sections occurs. The function of the bearing plate in the force transfer is significant. About 54% axial force of the joint section transfers via the bearing plate while the rest of the axi- al force transfers via the PBL connectors and shear studs. The proportions of the axial force transfer of the connectors present the saddle-shape distribution that is large at both ends and small in the middle.
出处
《桥梁建设》
EI
CSCD
北大核心
2015年第1期45-50,共6页
Bridge Construction
基金
中国铁路总公司科技开发计划重点课题项目(2009G004-C)~~
关键词
铁路桥
钢箱梁
钢-混结合段
传力机理
PBL键
有限元法
应力分析
railway bridge steel box girder steel and concrete joint section force transfer mechanism
PBL connector
finite element method
stress analysis
