在役高速公路钢筋混凝土连续梁桥表面裂缝分布规律及形成机理研究  

Research on the Distribution Rules of Cracks on Reinforced Concrete Continuous Girder Bridge Deck of In-service Expressway and the Formation Mechanisms

作　　者：蔡裕[1] 聂力 程霄翔 CAI Yu;NIE Li;CHENG Xiao-xiang(Jiangxi Ganyue Expressway Co.Ltd.,Nanchang 330025,China)

机构地区：[1]江西赣粤高速公路股份有限公司,南昌市330025

出　　处：《公路》2020年第11期136-143,共8页Highway

摘　　要：以全长为4359m、右幅共23联173跨、左幅共25联173跨的某特大桥为研究对象,基于工程检测结果,归纳典型在役高速公路钢筋混凝土连续梁桥表面裂缝分布规律,并以数值分析为手段,深入研究其裂缝形成机理。研究发现,车速降低时,结构承受车辆荷载作用的时间变长,承受慢速移动荷载的梁体更容易开裂;裂缝多位于跨中腹板(沿竖向分布)和跨中底板(沿横向分布),主要由车辆荷载引起;部分桥面板沿纵向开裂,其主要原因是温度梯度荷载,而非汽车荷载。A 4359-meter long in-service highway bridge with reinforced concrete continuous girder structure as the study background,the rule of crack distributions on the deck has been concluded.The formation mechanisms of the cracks have been revealed by means of numerical analysis.It is found that:the girders undertaking low-speed vehicles load are prone to crack due to the long load-carrying duration;most cracks occur on webs and bottom slabs at the mid-span,which are caused by the vehicle loads;and the longitudinal bridge cracks found on some bottom slabs are mainly caused by the temperature gradient loads,rather than the vehicle loads.

关 键 词：连续梁桥 钢筋混凝土 裂缝 车速 车辆荷载 温度 研究 

分 类 号：U445.71[建筑科学—桥梁与隧道工程]