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通过一组(3片)较大比例简支T梁进行体外预应力正截面抗弯加固的试验研究,在带载加固和分阶段受力的前提下,论述了加固试验梁在不同裂缝宽度、不同纵筋应变、不同跨中挠度情况下的加固效应,探讨了体外预应力对提高加固刚度、极限承载力的加固效应,提出了体外预应力的加固时机,同时还对预应力张拉控制应力的取值提出了新的建议,为该技术在设计和实际工程中的应用提供参考。
Through a group of (3) larger proportion of simple T-beams for prestressed external reinforcement of normal section of the test, under the premise of load reinforcement and staged force, the paper discusses the reinforcement of the test beam in different crack width, Different longitudinal reinforcement strain and different span mid-span deflection, the reinforcement effect of external prestress to improve the stiffness and ultimate bearing capacity of reinforcement is discussed, and the reinforcement timing of external prestressing is put forward. At the same time, the prestressing tension control stress The author puts forward some new suggestions for the application of this technology in the design and actual engineering.