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以某高速公路特大桥的连续预应力混凝土小箱梁为试验对象,通过对自密实混凝土-预应力加固混凝土箱梁的极限承载力对比试验,研究自密实混凝土-预应力加固方法对此类结构开裂后的加固效果。试验结果表明:加固后小箱梁的极限承载力大幅提高;自密实混凝土与旧混凝土结合紧密,两者变形协调良好。且加固效果良好。
Taking a continuous prestressed concrete box girder of a highway super-bridge as a test object, this paper studies the self-compacting concrete-prestressing reinforcement method by comparing the ultimate bearing capacity of self-compacting concrete-prestressed reinforced concrete box girder. Cracking after the reinforcement effect. The test results show that the ultimate bearing capacity of the box girder is greatly increased after the reinforcement; the self-compacting concrete is tightly combined with the old concrete and the deformation is well coordinated. And the reinforcement effect is good.