悬浇箱梁节段张拉后腹板裂纹成因分析与防治  

Analyse and Control of Cracks of Prestressed Concrete Box Girder Web

作　　者：李正[1] 韩大章[1] 戴捷[1] 

机构地区：[1]江苏省交通规划设计院有限公司,江苏南京210005

出　　处：《现代交通技术》2009年第3期37-40,共4页Modern Transportation Technology

摘　　要：对某悬浇预应力连续箱梁纵向预应力下弯钢束张拉后,腹板沿着波纹管出现裂纹的现象进行了分析,并分别用拉-压杆模型、三维实体有限元模型和钢筋混凝土非线性有限元模型进行了计算,总结了腹板开裂的主要原因,提出了裂纹控制措施的建议,可为预应力连续箱梁的合理设计和同类问题的处理提供参考。According to web cracks along the bellows of a prestressed continuous box girder bridge in cantilever construction, this paper analyses the main causes of cracks by strut-and-tie mode, 3-D finite element model and nonlinear finite element model of reinforced concrete. And the reasonable proposal is given based on the the mechanical mechanism. The suggestions for the prevention of web cracks and the design of prestressing tendon are also given. The results could be taken as reference for similar problem.

关 键 词：预应力箱梁 腹板裂纹 拉-压杆模型 有限元 钢筋混凝土 防治措施 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]