预应力混凝土连续刚构桥底板崩裂成因及处理方案

Discussion of the Causes and Treatments of the Soleplate Crack of the Continuous Rigid Frame Bridge

对连续刚构桥中跨底板混凝土在纵向预应力束引起的径向力作用下可能崩裂的现象进行了分析,分析了崩裂的原因,阐述了径向力、箍筋应力的计算过程及径向力纵桥向分布情况;提出了避免这种崩裂的一些措施。结合工程实例探讨了对已压浆情况下崩裂问题的处理方案。本研究中的分析处理方法适用于其它空间配束的桥型。

This paper analyses the causations of soleplate crack of continuous rigid frame bridge,including the analysis of the causes of crack,computational process of radial force and stirrup stress,and radial force along the bridge.The paper also puts forward some measures of avoiding the soleplate crack,and discusses the treatments of the corrugated pipe grouted in the project.Analytic method of this paper can be applied to other bridges of spatial bars.