Prestressed Concrete Technology 预应力混凝土 (英语论文).doc

PAGE \* MERGEFORMAT1 Prestressed Concrete Technology 提纲： 摘要：预应力混凝土的定义 正文：预应力混凝土的应用、实例应用 讨论：预应力混凝土的优点和缺点 总结：预应力混凝土的发展的前景 Introduction Prestressed concrete and reinforced concrete in principle are clearly different. In the design of the reinforced concrete beams, regardless of the concrete can be assumed that the tensile strength, for bending moment of tension is caused by reinforced to resist, the tension is through between reinforcement and concrete bonding and passed to the steel. For large scale craze and deformation for, although the high strength concrete has good bonding, to a great extent can restore; But in the concrete and steel bonding between poor ordinary concrete, is in fact cant recover. On the other hand, in the prestressed concrete, the purpose of prestressed reinforced by rapping or through the special is the anchorage to exert a force concrete, so all can have the function of concrete structure. Requirements of prestressed steel is used to produce active component in advance to add load, and cracking and deformation in larger extent can be restored. Abstract In order to avoid reinforced concrete structure of the premature fracture, make full use of high strength steel and high strength concrete, tried to in the concrete structure or structures under load before use, through the force applied, make by the tensile stress components is reduced, and even in pressure stress state of concrete component. Preloading stress is used to reduce or offset load caused by the concrete tensile stress, and the structure of the components in the smaller tensile stress control range, and even in the compression state, to delay the generation of crack in concrete and development, so as to improve the anti-cracking performance component and rigidity. Main text Prestressed concrete component to the method of pretensioned stressing and posttensioned. 1.pretensioned stressing In the concrete pouring, first by steel wire steel strand or will be composed of the prest