空心板梁桥结构退化规律及其预测研究

通过资料调研整理,总结了上海市公路与城市道路预应力混凝土和普通钢筋混凝土梁桥结构的常见病害特点,运用统计方法建立了空心板梁桥结构技术状况退化曲线和结构状况变化的预测模型。结果表明:空心板梁桥主要病害类型为主梁混凝土碳化、钢筋锈蚀,主梁混凝土裂缝,铰缝损伤,支座综合病害,伸缩缝损坏、墩台顶渗水,混凝土表层缺陷;至2014年底,上海市各区域桥梁技术状况指标BCI平均值为92.4,总体技术状况良好;预应力混凝土和钢筋混凝土空心板梁桥大致分别在20 a和15 a桥龄时结构状况退化为三类(C级)。

Study on Degradation Law and Prediction of Hollow Slab Girder Bridge

By investing and sorting out the information,the common disease characteristics of the pre-stressed concrete and ordinary reinforced concrete girder bridge structures of the highways and urban roads in Shanghai are summarized.The prediction model of the technical status degenerated curve and structural status change of the hollow slab girder bridge is established by the statistical approach.The result shows that the main disease types of the hollow slab girder bridge are the concrete carbonation of the main girder,the corrosion of reinforcement,the concrete crack of the main girder,the damage of hinge joint,the comprehensive diseases of support,the destroy of expansion joint,the water seepage of pier top and the surface defect of concrete.By the end of 2014,the average value of BCI of bridge technical condition indexes in all areas of Shanghai was 92.4 and the general technical conditions were good.When the bridge ages of the pre-stressed concrete and the reinforced concrete hollow slab girder bridges are separately 20 a and 15 a,the structural degradation is Class Ⅲ(Class C).