本文介绍了中强度冷轧带肋钢筋的机械性能和应力松弛试验结果。同时对该种钢丝配筋的预应力空心板的强度、刚度和抗烈性也进行了试验。中强度冷轧带肋钢筋的强度标准值为 1170MPa ,极限伸长率 (δ10 0 )为4 0 % ,松弛损失 (10 0 0h ,2 0± 1℃ )不超过 8%σcon。与 6 5 0级钢筋相比 ,这种钢筋强度较高 ,可节省预应力钢筋 40 %左右 This paper presents the mechanical properties and stress relaxation test results of medium-strength cold-rolled ribbed bars. At the same time, the strength, stiffness and resistance of the prestressed hollow slab with steel wire reinforcement were also tested. The standard strength of medium-strength cold-rolled ribbed steel bars is 1170 MPa, ultimate elongation (δ10 0) is 40%, and relaxation loss (100°, 20±1°C) does not exceed 8%σcon. Compared with 650 steel bars, this steel bar has high strength and can save about 40% of prestressed bars.