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一、前言 目前,建筑工程中的中小型预应力砼构件普遍采用冷拔低碳钢丝作为预应力筋。冷拔低碳钢丝强度标准值为600～700MPa,延伸率δ_(100)为2％～3％,σ_(0.2)/σ_b>0.94。由此看来,冷拔低碳钢丝强度波动范围大,延伸率低,条件屈服强度与抗拉强度σ_b接近,对构件后期变形不利,构件的结构性能不好。另
I. INTRODUCTION At present, the use of cold drawn low carbon steel wire as a prestressed tendon is commonly used in small and medium-sized prestressed concrete components in construction projects. The standard value of the cold-drawn low-carbon steel wire is 600-700 MPa, the elongation δ _ (100) is 2%-3%, and σ — (0.2)/σ — b> 0.94. In view of this, cold-drawn low-carbon steel wire has a large range of strength fluctuation, low elongation, and the conditional yield strength is close to the tensile strength σ_b, which is unfavorable to the later deformation of the component and the structural performance of the component is not good. another