Mechanical Behavior Analysis On Reinforced Concrete Beams Strengthened With FRP Laminates

The developed materials science and the increased production level make the compound materials widely used in construction field. The request for improving the residence circumstance, enhancing the living quality and constructing a saving society brings more and more strengthening and rebuilding projects. Fiber reinforced polymer (FRP) which is light and strong is neatly applied in the areas. The study on reinforced concret beams strengthened with FRP has been continually perfected under the practice. The theoretics on bending, shearing, anchoring in strengthened components have been checked up by the test and exertion. The objects studied has been changed from the simple member to the structure system. In recent years, our team accomplished a series of test on 8 simple reinforced concret beams and 11 continues reinforced concret beams, which changed different FRP and disparate load history. Based on those, this thesis has researched the mechanics behavior affect on reinforced concret beams by the FRP, concluded that cracks in the beams grow slowly and distribute discretely; the bending stiffness can be divided into four phases according to the cracks developments; analyzed the impact to the stiffness caused by the quantity and type of FRP; discussed the failing reason; summaried that different cracks bring different broken modes; changed position, quantity, direction can control the crack transformation and the broken modes, increase the plasticability of the beam; paved a way for the strengthening design object changing from single component to the structure system. Based on the test , this thesis analyzes the data, brings forward the possibility of adjusting the bending moment of the reinforced concret beams strengthened with FRP, gives suggestion for the later research.