钢纤维水泥砂浆加固钢筋混凝土足尺梁抗弯性能

为了使钢纤维水泥砂浆这种新的加固材料能早日在土木工程领域得到应用,对采用此材料加固的梁的抗弯性能进行了试验研究.试验包括1根对比梁和6根用钢纤维水泥砂浆钢筋网加固的试验梁,试验梁采用三面U形加固形式,量测主要项目为试验梁裂缝分布形态,荷载-挠度曲线,钢筋、混凝土及加固砂浆的应变发展规律等.通过改变加固梁的加固配筋率和受力形态,研究了这种加固技术对钢筋混凝土梁的承载力、破坏形态、截面刚度及裂缝分布等的影响.试验结果表明:采用钢纤维水泥砂浆对足尺钢筋混凝土梁进行抗弯加固,能较大幅度地提高钢筋混凝土梁正截面承载力和刚度;钢纤维水泥砂浆中的钢纤维能有效地抑制裂缝的产生,使试件具有良好的抗裂性能.

Flexural behaviors of RC beams reinforced by steel fiber ferrocement mortar

In order to make steel fiber ferrocement mortar-a new reinforcement material soon be applied in the field of civil engineering, experimental tests were performed on the flexural behaviors of RC beams reinforced by steel fiber ferrocement mortar. A datum beam and six test beams reinforced with the steel fiber ferrocement mortar were employed. The test beams were reinforced in the form of U-shape. The crack distribution, load-deflection and strain development of concrete, steel and mortar were measured. By changing the reinforcement ratio and force patterns of RC beams, the influences of the proposed method on the bearing capacity, failure mode, section stiffness and crack distribution were studied. The results show that the use of the steel fiber ferrocement mortar in RC beams for flexural behaviors can greatly enhance the bearing capacity and stiffness of the normal section of RC beams. The steel fibers in the steel fiber ferrocement mortar can effectively restrain the crack development so as to ensure that the specimens have favorable anti-cracking performance.