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在钢筋混凝土构件中对钢筋(钢丝)施加预应力能提高构件的抗裂性能,限制裂缝的发展,增加构件的刚度,提高构件的耐久性。钢丝张拉力的大小直接影响构件的结构性能,张拉力不足,构件的抗裂度达不到要求,同时也影响构件的刚度与耐久性。但张拉力过高,构件的脆性增加,延性降低,在构件破坏前没有明显的预兆,其危害性并不比张拉力不足低。特别是采用冷拔低碳钢丝
The prestressing of rebar (steel wire) in reinforced concrete components can improve the crack resistance of the components, limit the development of cracks, increase the stiffness of the components, and increase the durability of the components. The tensile force of the wire directly affects the structural performance of the component. The tensile force is insufficient, and the crack resistance of the component does not meet the requirements. At the same time, it also affects the stiffness and durability of the component. However, if the tensile strength is too high, the brittleness of the component increases, the ductility decreases, and there is no obvious sign before the component is destroyed. The hazard is not lower than the tensile strength. In particular, cold drawn low carbon steel wire