预应力混凝土桥箱梁底面横向裂缝分析

Analysis of Lateral Cracks on the Bottom of Prestressed Concrete Bridge Box Girder

预应力混凝土箱梁由于在受力性能方面良好,在高速桥梁互通工程中得到了良好的应用,但是由于结构受力和施工工艺的复杂性,该类型桥梁在设计和施工都存在质量较难控制等原因,造成部分桥梁在投入使用过程中箱梁底面就出现较多的横向裂缝,裂缝的大量出现严重影响了桥梁的正常使用,对结构的承载能力存在一定的影响。以一座预应力混凝土箱梁桥为例,通过对材料强度、铺装层层厚度、预应力损失、承载力评定等方面对该桥箱梁底面横向裂缝进行了分析,并对防止此类裂缝提出了改进措施,可供类似工程借鉴。

Due to good mechanical behavior,the prestressed concrete box girder has been applied rapidly in the high-speed bridge interchange project,however because of the complexity of the structure stress and the construction technolo-gy,difficult in quality control and other reasons exist in the design and construction,there are a large number of surfacecracks in part of the bridge in use,which seriously affect the normal use of the bridge,there is impacts on the bearingcapacity of the structure for sure.In this paper a prestressed concrete box girder bridge is taken as an example,based onthe strength of materials,pavement layers thickness,prestress loss,bearing capacity evaluation and other aspects of thebox girder bottom surface transverse cracks are analyzed to prevent such cracks,improving measures are also proposedwhich can provide reference for similar engineering.