大挠度差新旧桥拼宽伸缩缝设计与改进  

Design and Improvement of Wide Expansion Joints for New and Existing Bridges with Large Deflection Differences

作　　者：刘卫 LIU Wei(China Railway 15th Bureau Group Co.Ltd.,Shanghai 200000,China)

机构地区：[1]中铁十五局集团有限公司,上海200000

出　　处：《铁道建筑技术》2025年第4期14-16,70,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司揭榜挂帅课题(2024-JB02);中铁十五局集团有限公司科技研发课题项目(2023B11)。

摘　　要：探讨新旧桥拼宽伸缩缝设计与改进措施,强调桥梁在城市化进程中的重要性及其运营安全性。针对新旧桥设计刚度差异导致的接缝挠度差问题,提出采用弹性混凝土和钢板加强连接的方案,以改善接缝性能。通过对某大桥拼宽结构分析,研究不同荷载下新旧桥的变形协调性,并利用有限元分析方法评估弹性混凝土接缝的力学行为。结果表明,挠度差超过20 mm会对接缝造成损害;针对性改进方案可增强结构的稳定性和耐久性。This paper explores the design and improvement of expansion joints in the widening of new and old bridges,emphasizing the importance of bridges in the urbanization process and their operational safety.To address the issue of joint deflection differences caused by the stiffness discrepancies between new and old bridge designs,a solution utilizing elastic concrete and steel plates for enhanced connection is proposed to improve joint performance.By analyzing the structure of a certain bridge widening project,the study examines the deformation coordination of new and old bridges under different loads and employs finite element analysis to evaluate the mechanical behavior of elastic concrete joints.The results indicate that a deflection difference exceeding 20 mm can damage the joint,leading to a proposed improvement scheme to enhance the stability and durability of the structure.

关 键 词：大挠度差 拼宽桥梁 弹性混凝土 刚度 改进措施 数值分析 

分 类 号：U445.6[建筑科学—桥梁与隧道工程]