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一、前言 “双钢筋”是二根相距3厘米左右的纵筋并焊有一定间距短横筋的梯格式钢筋。配置这种双钢筋的混凝土构件,由于横筋的作用,可以在较高的纵筋应力水平下有效地抑制裂缝宽度的发展,因而可以较大幅度地提高非预应力钢筋的强度等级,同时还能改善构件在使用阶段的工作性能。所以,双钢筋混凝土构件的应用与发展,在我国是具有较大的技术经济意义的。近几年来,由于双钢筋机的研制成功,双钢筋混凝土在我国已得到了较大数量的推广应用,至今
I. INTRODUCTION “Double steel bar” is two ladder-shaped steel bars with a spacing of about 3 cm apart and welded with a certain spacing of short horizontal bars. With this type of double-reinforced concrete member, due to the action of the transverse ribs, the development of the crack width can be effectively suppressed at a higher level of the vertical tendon stress, and thus the strength level of the non-prestressed steel bar can be greatly improved, and at the same time Improve the performance of the components during the use phase. Therefore, the application and development of double-reinforced concrete components are of great technical and economic significance in China. In recent years, due to the successful development of double reinforcement machines, double-reinforced concrete has gained a large number of applications in our country.