通过空心板原型梁按比例缩小后制作3片混凝土实心模型梁,在预压荷载和利用预张紧钢丝绳网片—聚合物砂浆加固后不同荷载下考察梁的力学性能、破坏形态及裂缝发展。结果表明,该加固方法能有效地限制裂缝发展,开裂荷载提高50%以上;在较小荷载下加固件符合平截面假定,而在接近梁破坏及破坏过程中,应变突变,梁瞬间破坏;钢丝绳应力能在梁底均匀分布,并且加固体和原混凝土梁可以同步工作;在钢筋屈服后到梁破坏之前,Mu/My介于1.8~2.0,Δu/Δy介于1.4~1.5,梁体存在较大的安全储备。 Through the reduction of the original prototype beam of the hollow slab, 3 concrete solid model beams were made, and the mechanical properties, failure modes and crack development of the beam were investigated under preloading and pre-tensioned steel wire mesh-polymer mortar under different loads. The results show that the reinforcement method can effectively limit the development of cracks and increase the cracking load by more than 50%. The reinforcement complies with the assumption of flat section under small load, but the strain suddenly changes and the beam breaks instantly when the beam is damaged and destroyed. The stress can be uniformly distributed on the beam bottom, and the reinforcement and the original concrete beam can work synchronously. Before the steel bars yield to the failure of the beam, the Mu / My ranged from 1.8 to 2.0 and the Δu / Δy ranged from 1.4 to 1.5. Large safety reserve.