钢桥中错位厚板十字接头的力学性能与补强方法  

Mechanical Properties and Reinforcement Method of Misaligned Thick Plate Cross Joints in Steel Bridge

作　　者：沈翀 苏庆田[1] 陈友生 SHEN Chong;SU Qing-tian;CHEN You-sheng(College of Civil Engineering,Tongji University,Shanghai 200092,China;Sichuan Road&Bridge East China Construction Co.,Ltd.,Chengdu 610200,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]四川路桥华东建设有限责任公司,四川成都610200

出　　处：《东北大学学报（自然科学版）》2024年第5期729-737,共9页Journal of Northeastern University(Natural Science)

基　　金：福建省交通运输科技项目(202126)。

摘　　要：针对钢桥中厚板十字接头出现错位缺陷的问题,采用有限元方法研究了错位缺陷对厚板十字接头力学性能的影响,提出一种分离式焊接钢板补强方法并对补强钢板的尺寸进行优化设计.研究结果表明,错位缺陷对厚板十字接头的力学性能产生较大的影响,板件竖向应力在附加弯矩作用下显著增大.提出的焊接钢板补强方法使得补强后竖向支承板承担大部分轴力与弯矩,强度控制设计截面位于补强钢板底部焊缝处,可通过增加补强钢板的高度提升补强效率,最高可达48%.本文推荐了不同错位量下补强钢板的合理尺寸,可为类似工程中错位厚板十字接头的补强方法提供参考.Aiming at the problem of misalignment defects in the cross joint of thick plates in steel bridges,the finite element method was used to study the influence of misalignment defects on the mechanical properties of cross joints of thick plate,and a reinforcement method of welding separated steel plates was proposed and the size of the steel plate for reinforcement was optimized.The results show that misalignment defects have a signficiant effect on the mechanical properties of cross joints of thick plate,and the vertical stress increases significantly under the influence of additional bending moment.The proposed reinforcement method of welding separated steel plates makes the vertical support plate of cross joint bear most of the axial force and bending moment after reinforcement.The key section for design is located near the weld at the bottom of the steel plate for reinforcement,and the efficiency of reinforcement can be improved by increasing the height of the steel plate for reinforcement,up to 48%.Different sizes of steel plates for reinforcement are recommended for cross joints with different misalignments,which can provide a reference for the reinforcement methods of misaligned thick plate cross joints in similar projects.

关 键 词：钢桥 十字接头 错位缺陷 补强方法 有限元方法 

分 类 号：U441[建筑科学—桥梁与隧道工程]