通过对灵江二桥的病害调查,病害主要为支点斜向裂缝和跨中腹板水平裂缝,建立不考虑竖向预应力的计算模型,根据计算结果,支点处腹板主拉应力超过规范限值,抗剪承载能力不足,分析跨中腹板开裂主要原因为宽板效应和施工时内外温差造成的。 Through the investigation of the disease of the second bridge of Lingjiang River, the main disease is the oblique crack of the fulcrum and the horizontal crack of the mid-web. The calculation model without considering the vertical prestress is established. According to the calculation results, the main tensile stress of the web at the fulcrum exceeds the standard limit , Shear capacity is not enough, the main reason for the analysis of the cross-web cracking is caused by the wide-plate effect and the temperature difference between inside and outside during construction.