混凝土是现代最重要的人造工程结构材料,而预应力是改进混凝土结构性能,提高工程结构质量的有效手段。由于混凝土及预应力混凝土具有许多优越性,例如易于成型、能耗低、耐久性好,与钢材结合可以组成各类不同承重结构。但是,混凝土存在自重大、抗压比和抗拉强度低等弱点,限制了它的扩大应用。所以科技界一直把轻质、高强作为混凝土发展的主攻方向。近几年来,随着现代科学技术的进步,预应力混凝土的应用有了较大的发展。从 Concrete is the most important artificial engineering structural material in modern times, and prestressing is an effective means to improve the performance of concrete structure and improve the quality of engineering structure. As the concrete and prestressed concrete has many advantages, such as easy molding, low energy consumption, good durability, combined with the steel can be composed of different types of load-bearing structure. However, the existence of heavy concrete, compressive strength and tensile strength and other weaknesses, limiting its expansion and application. Therefore, the scientific community has been the light, high strength as the main direction of development of concrete. In recent years, with the progress of modern science and technology, the application of prestressed concrete has been greatly developed. From