径向力作用下预应力混凝土箱梁底板抗裂设计方法及应用  

Crack-resistance Design Method and Its Application for Bottom Plate in Prestressed Concrete Box Girder Under Radial Force

作　　者：张长林 陈宝 李林 唐国斌 ZHANG Changlin;CHEN Bao;LI Lin;TANG Guobin(Highway Administration Bureau of Henan Transportation Departmen,Zhengzhou,Henan 450000,China;Henan Guandu Huanghe Bridge Construction and Developmen CO.,LTD,Zhengzhou,Henan 450000,China;Henan Transportation Research Institute Co.,Ltd.,Zhengzhou,Henan 450015,China)

机构地区：[1]河南省交通运输厅公路管理局,河南郑州450000 [2]河南官渡黄河大桥开发有限公司,河南郑州450000 [3]河南省交通科学技术研究院有限公司,河南郑州450015

出　　处：《公路工程》2020年第6期134-137,共4页Highway Engineering

基　　金：河南省重大科技专项(151100310900),河南省交通科技计划项目(2019J-2-6)。

摘　　要：针对合龙束径向力作用下变截面预应力箱梁底板在施工过程中的崩裂问题,总结了纵向抗裂设计、合龙束局部防崩设计、底板混凝土防分层设计及横向抗剪设计等4类破坏模式下的抗裂设计方法,给出了对应的简化计算公式,进一步形成底板抗裂的综合设计框架,并以一座大跨径连续箱梁桥为背景,进行了工程应用。研究内容可为类似工程的箱梁底板防裂设计提供借鉴。Aiming at the crack issue of bottom plate in prestressed concrete box girder under radial force generated by closure strands stretching during construction,four crack-resistance design contents,including longitudinal anti-crack design,anti-breakage design,anti-delamination design of concrete and transvers shearing design,were summarized.Also,the corresponding simplified calculation formulas were given.Then the comprehensive design framework for crack resistance of bottom plate was formed.Based on a large-span continuous box girder bridge,the proposed design method was applied.The presented study may provide a reference for crack-resistance design of bottom plate in prestressed concrete box girder.

关 键 词：预应力箱梁 径向力 合龙束 抗裂设计 应用 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]