普通钢筋混凝土箱梁桥腹板竖向裂缝成因分析  

ANALYSIS OF VERTICAL WEB CRACKS OF ORDINARY REINFORCED CONCRETE BOX-GIRDER BRIDGE

作　　者：丁勇[1] 赵启林[1] 马方圆[1] 段金辉[1] 

机构地区：[1]解放军理工大学工程兵工程学院,南京210007

出　　处：《工业建筑》2009年第S1期919-922,918,共5页Industrial Construction

基　　金：国家863项目资助(2007AA11Z120)

摘　　要：通过对江苏省内高速路段88座普通钢筋混凝土箱梁桥进行的23次检测统计,发现腹板竖向裂缝是该类桥梁十分普遍的一种病害。于是结合一座实桥的检测和相关试验数据,综合考虑了水化反应、日照温差、相对湿度差以及混凝土自身收缩等因素作用,利用有限元方法分析计算了腹板应力状态变化过程。分析计算结果表明:腹板拆模初期开裂的主要因素是水化反应,而裂缝后期扩展的主要因素则是腹板内外收缩差以及混凝土整体收缩受钢筋约束作用。During 23 detection statistics of 88 ordinary reinforced concrete box-girder bridges in Jiangsu Province,vertical web cracks were found to be the commonest hazard of this type of bridge.Based on detecting and related experimental data on a specific bridge,taking hydration,difference in temperature for sunshine,relative humidity increment and self-shrinkage increment all into consideration, the stress state of web is calculated with FEM.The results of analysis and calculation show that hydration is a major factor of web cracks during molding board dismantlement,the latter expansion of cracks is mainly because of shrinkage increment of web and reinforced binding when concrete shrinkage as a whole.

关 键 词：竖向裂缝 箱梁 腹板 收缩 裂缝 

分 类 号：U448.34[建筑科学—桥梁与隧道工程]