摘要
为了研究模数式伸缩缝的疲劳性能,开展了一种新型浅埋桥梁模数式伸缩缝的静力和疲劳试验。设计了一种桥梁模数式伸缩缝的加载装置,可模拟实际工程中伸缩缝所承受的垂直和水平荷载;分析了疲劳后伸缩缝荷载-挠度曲线和残余应变的变化规律;研究了模数式伸缩缝的疲劳裂纹类型、裂纹产生位置及疲劳破坏特性。结果表明:随着疲劳循环次数的增加,伸缩缝的刚度退化明显,伸缩缝中梁和横梁的残余应变增大;模数式伸缩缝疲劳裂纹以C型为主,中梁和横梁组件焊接部位易发生疲劳破坏。研究可为建立模数式桥梁伸缩缝的疲劳寿命评估模型提供参考。
In order to study the fatigue performance of modular expansion joints,a static and fatigue test on a new type of shallow-buried bridge modular expansion joints was carried out.A loading setup of bridge modular expansion joint was designed,which can simulate the vertical and the horizontal loads on the expansion joints in practical engineering.The load-deflection relationship and the residual strain of the expansion joint after fatigue were analyzed.The fatigue crack types,crack initiation locations and fatigue failure characteristics of modular expansion joints were studied.The results show that with the increase of fatigue cycles,the stiffness of the expansion joint degrades significantly,and the residual strain of the center beam and the support beam in the expansion joint increases.The fatigue crack of modular expansion joint is mainly C-type,and the welded parts of the center beam and the support beam components are prone to fatigue damage.This study can provide a reference for establishing the fatigue life assessment model of bridge modular expansion joints.
作者
马亚飞
彭安银
王磊
苏小超
张臣忠
张建仁
MA Yafei;PENG Anyin;WANG Lei;SU Xiaochao;ZHANG Chenzhong;ZHANG Jianren(School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;Hebei Baoli Engineering Equipment Group Co. , Ltd. , Hengshui, Hebei 053000, China)
出处
《中国科技论文》
CAS
北大核心
2020年第8期849-854,861,共7页
China Sciencepaper
基金
国家自然科学基金资助项目(51778068)
湖南省交通科技项目(201620)。
关键词
桥梁工程
模数式伸缩缝
疲劳
裂纹
破坏形式
bridge engineering
modular expansion joint
fatigue
crack
failure type
