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本文讨论了少筋混凝土梁的荷载～变形特性、安全度以及裂缝等问题。对十六根30×18×140厘米的梁进行了试验。试验结果表明,少筋混凝土梁的荷载～变形曲线在终裂后均有(dp)/(df)<0的下降段,其破坏属脆性范畴。少筋混凝土梁在使用荷载作用下一旦开裂,裂缝宽度很大,难以满足对限裂和耐久性的要求。少筋混凝土梁的安全度与混凝土或钢筋混凝土梁相比,孰高孰低,尚待进一步研究。混凝土往往由于温度、收缩而发生裂缝,对少筋混凝土的承载能力影响很大。人们对少筋混凝土的理论和实践,有所疑虑,是可以理解的。
This article discusses the problems of load-deflection characteristics, safety, and cracking of less-reinforced concrete beams. Sixteen 30 x 18 x 140 cm beams were tested. The test results show that the load-deformation curve of the less-reinforced concrete beam has (dp)/(df)<0 decline after the final crack, and the damage is a brittle range. When the less-reinforced concrete beam cracks under the action of the load, the crack width is very large, and it is difficult to meet the requirements of the crack limiting and durability. The safety of less-reinforced concrete beams compared with concrete or reinforced concrete beams is low, and remains to be further studied. Concrete cracks occur due to temperature and shrinkage, which has a great influence on the bearing capacity of less-reinforced concrete. It is understandable that people have doubts about the theory and practice of less-reinforced concrete.