预应力空心板斜裂缝病害加固研究

Reinforcement Technology of Oblique Crack in Prestressed Hollow Slab Beam

以某空心板梁桥梁端斜裂缝病害为研究背景,采用端部植筋复合填充无收缩高性能混凝土加固方案,对施工工艺进行了研究,明确了加固施工的工艺、流程和控制指标。通过有限元分析结合加固后的荷载试验研究,结果表明采用端部植筋复合填充无收缩高性能混凝土可直接提高梁端配筋和截面积,从而提高梁端剪扭承载力,从根本上解决梁端斜裂缝病害,达到加固的目的。

Research background is the oblique crack disease at the end of A hollow slab girder bridge, planting reinforcement composite filling non-shrinkage high-performance concrete reinforcement at end of the beam is adopted, and the construction technology is studied. The craft, technological process and control indicators of reinforcement construction are defined. Finite element analysis is used and load test research after reinforcement is studied, the research shows that planting reinforcement composite filling non-shrinkage high-performance concrete can directly improve the reinforcement and sectional area of at end of the beam, thus improves the shear and torsional bearing capacity of the beam, fundamentally solving the disease of oblique cracks at the end of holly slab beam, and achieve the purpose of reinforcement.