大跨度混凝土斜拉桥主梁施工过程应力分析及防裂技术研究  

Study of Stress and Cracking Prevention Techniques for Main Girder of Long-span Concrete Cable-stayed Bridges at Construction Stages

作　　者：喻钊[1] 胡志坚[1] 吴大健[1] 王少兵[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2016年第6期1073-1077,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：江西省科技支撑计划项目(20132BBG70107);中央高校基本科研业务费专项资金项目(2013-IV-016)资助

摘　　要：为研究大跨度混凝土斜拉桥施工阶段主梁裂缝发展规律和控制方法,结合某大跨度混凝土斜拉桥施工阶段主梁裂缝实际观测数据和发展规律,基于有限元理论分析了主梁施工阶段施工缝处关键区域的应力变化规律,并研究了改变普通钢筋配置,添加临时预应力索等裂缝控制措施.结果表明,施工过程中大跨度混凝土斜拉桥主梁节段受力状况易使施工缝处产生裂缝;在施工阶段添加临时预应力索的防裂效果明显.To study the crack development and the corresponding control methods for main girder of long-span concrete cable-stayed bridge at construction stages,numerical simulations are carried out to analyze constructional stress distribution in critical segmental joints of the main girder and the numerical results are compared to the field measurements of cracks and their development for a long span concrete cable-stayed bridge.Cracking prevention techniques,including changing reinforcement ratios and adding temporary prestressed strands,are also investigated.The numerical results indicate that the constructional stress distribution for the main girders of long span concrete cable-stayed bridges can easily lead to cracking at the segmental joints,and that crack prevention effect from adding temporary prestressed strands is remarkable at construction stages.

关 键 词：大跨度混凝土斜拉桥 施工模拟 临时预应力索 防裂技术 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]