一、前言目前国内大量生产的热轧月牙纹钢筋,系冶金部有关科研、生产和使用单位于一九八○年共同研制的一种新外形产品。迄今为止,该产品尚无国家正式标准。但这几年的试用情况表明:纵横筋不相交的月牙纹钢筋(下称新外形钢筋)具有纵横筋相交的钢筋(下称老外形钢筋)所无法比拟的若干优点。尤其是弯曲性能,由于新外形钢筋纵横 I. Preface At present, the hot-rolled crescent-shaped steel bars mass-produced domestically are a new shape product jointly developed by the Ministry of Metallurgical Research and Production and Use Unit in 1980. So far, the product is still no official national standards. However, in recent years, the trial shows that the non-intersecting crescent-shaped reinforcing bars (hereinafter referred to as the “new-shaped reinforcing bars”) have a number of advantages unmatched by the intersecting reinforcing bars (hereinafter referred to as the " In particular, bending properties due to the new shape of vertical and horizontal bars