曲线节段预制箱梁连接键受力性能研究  

Analysis of Mechanical Performance of Connecting Keys of Curved Prefabricated Segmental Box Girder

作　　者：刘世明 孙宝珊 陈震 巴松涛 李晓克 LIU Shi-ming;SUN Bao-shan;CHEN Zhen;BA Song-tao;LI Xiao-ke(International Joint Research Lab for Eco-building Materials and Engineering of Henan Province,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;School of Civil Engineering and Communications,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Henan Fifth Construction Group,Zhengzhou 450007,China;Henan Provincial Academy of Building Research Co.,Ltd.,Zhengzhou 450053,China)

机构地区：[1]华北水利水电大学河南省生态建材工程国际联合实验室,河南郑州450045 [2]华北水利水电大学土木与交通学院,河南郑州450045 [3]河南五建建设集团有限公司,河南郑州450007 [4]河南省建筑科学研究院有限公司,河南郑州450053

出　　处：《世界桥梁》2023年第2期53-60,共8页World Bridges

基　　金：国家自然科学基金项目(51508189);河南省科技攻关项目(232102321079)。

摘　　要：为给曲线节段预制箱梁环氧树脂胶接缝连接键设计提供依据,以位于半径360 m平曲线上的郑州南四环高架桥工程新密立交桥为背景,以连接键的功能需求为目标,建立数值分析模型,采用六自由度的弹性连接单元模拟接缝连接键,研究连接键轴力和剪力沿跨径传递的规律。结果表明:在永久荷载作用下,接缝处各连接键均处于受压状态,从桥墩到跨中逐渐减少;汽车荷载作用下,连接键拉力从桥墩到跨中逐渐减少,而压力则逐渐增加。连接键传递剪力大小顺序为腹板连接键>顶板中部连接键>顶板悬臂端连接键>底板连接键,其中腹板连接键和顶板中部连接键在永久荷载和汽车荷载作用下,传递的剪力分别占总剪力的69.6%~69.7%和49.2%~64.9%。箱梁接缝连接键传递剪力时受平曲线影响显著,设计时应考虑其实际受力需求,以确保可靠传力。The mechanical performance of connecting keys in epoxy joints of curved prefabricated segmental box girder is studied. The Xinmi Interchange of the Fourth Ring Road Viaduct Project in Zhengzhou, with a curvature radius of 360 m, is used as a case.A finite element model incorporating elastic link elements of 6 degrees of freedom was built up taking the functional requirements of connecting keys as targets, to simulate the connecting keys and study the axial forces of connecting keys and the shear force transfer paths along span length as well. The results demonstrate that all the connecting keys at the joints are under compression, and the compression weakens from piers towards midspan. Under vehicle loads, the tensions of connecting keys decrease from piers towards midspan, but the compression gradually rises. The shear force transfer capacity of connecting keys in the webs are the strongest, then followed the connecting keys in the center of the top plate, the connecting keys at the cantilever tip of top plate and the connecting keys in the base plate. Among which, the connecting keys in the webs and the connecting keys in the center of the top plate contribute 69.6%-69.7% and 49.2%-64.9% of the total shear forces transferred, respectively, under permanent and vehicle loads. Curvature radius is a critical influential factor of the shear force transfer capacity of the connecting keys, which should be given great concern in bridge design to ensure the reliable load transfer performance.

关 键 词：曲线桥 节段预制箱梁 环氧树脂胶接缝 连接键 功能需求 轴力 剪力 传力机理 

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]