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为研究高强再生混凝土梁正截面受力变形特点和破坏特征,进行了不同再生粗骨料取代率的高强再生钢筋混凝土简支梁抗弯性能试验。4个试件的截面及配筋相同,设计再生混凝土强度为C55。分析了各试件的破坏特征、承载力、延性、耗能等。研究表明:高强再生混凝土梁与高强普通混凝土梁一样,正截面受弯破坏都要经历弹性、开裂、屈服以及破坏4个阶段;正截面应变仍然服从平截面假定;相同条件下,高强再生混凝土梁的开裂弯矩和极限抗弯承载力较普通混凝土有所降低,但相差不大;抗弯刚度小于高强普通混凝土抗弯构件,但延性较好。最后,根据现行混凝土结构设计规范中普通混凝土梁的计算公式,验算了高强再生混凝土梁的极限承载力,其与高强普通混凝土梁的极限承载力差别不大。
In order to study the normal deformation and failure characteristics of high strength recycled concrete beams, the bending performance of high strength recycled concrete simply supported beams with different recycled coarse aggregate replacement ratio was tested. The cross section and reinforcement of the 4 specimens are the same, and the strength of the recycled concrete is designed to be C55. The failure characteristics, bearing capacity, ductility and energy consumption of each specimen were analyzed. The results show that the high-strength recycled concrete beams, like the high-strength ordinary concrete beams, undergo four stages of elasticity, cracking, yielding and failure under normal bending and bending. The normal strain still follows the assumption of flat section. Under the same conditions, The bending moment and the ultimate flexural capacity are lower than ordinary concrete, but the difference is not obvious. The flexural rigidity is less than that of ordinary high strength concrete but the ductility is better. Finally, the ultimate bearing capacity of high-strength recycled concrete beams is calculated based on the formula of ordinary concrete beams in the current code of design of concrete structures, which has little difference with the ultimate bearing capacity of high-strength ordinary concrete beams.