预应力混凝土连续箱梁弯桥斜向裂缝病害成因分析及加固方案研究

Cause Analysis and Reinforcement Scheme Research of Oblique Crack Disease of Prestressed Concrete Continuous Box Girder Curved Bridge

以一座预应力混凝土连续箱梁弯桥为案例,首先介绍了该桥边跨腹板及底板斜向裂缝病害情况,继而结合计算分析结果,分析了斜向裂缝产生的原因和机理,提出了通过对边跨简支端内侧向上支顶的方法,减小边跨扭矩,调整主梁受力状态。该方法可为预应力混凝土连续箱梁弯桥的抗扭加固提供参考。

Taking a prestressed concrete continuous box girder curved bridge as an example,the diseases of the oblique cracks in the web and bottom plate of the side span of the bridge are firstly introduced,and then the causes and mechanism of the oblique cracks are analyzed in combination with the calculation and analysis results,and the method of jacking up the inner side of the simply supported end of the side span is put forward,so as to reduce the torque of the side span and adjust the stress state of the main girder.This method can provide reference for the anti-torque reinforcement of the prestressed concrete continuous box girder curved bridge.