连续刚构桥悬臂施工中腹板斜裂缝分析与控制  

Analysis and Control of Diagonal Cracks in Web of Continous Rigid Frame Bridge during Cantilever Construction

作　　者：刘超 郭夏 成厚松 LIU Chao;GUO xia;CHENG Housong(Central and Southem China Municipal Engineering Design and Research Institute Co.,Ltd.,Wuhan 430010,China)

机构地区：[1]中国市政工程中南设计研究总院有限公司,武汉430010

出　　处：《交通科技》2020年第6期37-40,共4页Transportation Science & Technology

摘　　要：文中以某预应力连续刚构桥为工程实例,分别利用midas建立整体杆系模型、ANSYS局部实体模型。分析了悬臂施工中腹板沿波纹管方向斜裂缝产生的原因。提出了计算此类裂缝的思路:拉压杆模型计算承载力,轴心受拉计算裂缝宽度。消除此类裂缝的最佳有效方式是施工中先张拉竖向预应力。Taking a prestressed continous rigid frame bridge as an engineering example,the whole member model and local solid model are built with Midas and Ansys respectively.The causes of inclined cracks in web along corrugated pipe in cantilever construction is analyzed.An idea of calculating such cracks is put forward:the bearing capacity is calculated by strut-and-tie model and the crack width is calculated by axial tension theory.The best effective way to eliminate this kind of crack is to stretch the vertical prestressed reinforcement first.

关 键 词：预应力混凝土 连续刚构 劈裂力 悬臂施工 腹板裂缝 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U445.466[交通运输工程—道路与铁道工程]