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为考察再生混凝土强度变异性对再生混凝土梁最小配筋率的影响,以普通混凝土梁最小配筋率为参照,保持规范目标可靠指标不变,分析了再生混凝土梁受弯时的最小配筋率和受剪时的最小配箍率,并将结果与普通混凝土梁进行了对比.分析结果表明,再生混凝土梁受弯时,由于钢筋的存在,再生混凝土强度的变异性对其受弯承载力变异性的影响较小,再生混凝土梁的最小配筋率提高很小.对于再生混凝土梁受剪,当再生混凝土强度变异系数为0.2时,C30再生混凝土梁的最小配箍率为0.17%,相比较普通混凝土梁约增加32.0%.通过合理增加配筋可以保证再生混凝土梁的受弯、受剪可靠指标与普通混凝土梁一致.
In order to investigate the influence of the strength variation of recycled concrete on the minimum reinforcement ratio of recycled concrete beam, taking the minimum reinforcement ratio of ordinary concrete beam as reference, keeping the reliability index of standard target unchanged, the minimum reinforcement ratio of recycled concrete beam during bending And the minimum stirrup ratio at the time of shearing, the result is compared with the ordinary concrete beam.The results show that when the recycled concrete beam is bent, the variation of the flexural capacity of the recycled concrete beam due to the presence of steel bars and the strength of recycled concrete And the minimum reinforcement ratio of recycled concrete beam increases little.For the shear of recycled concrete beam, when the coefficient of variation of recycled concrete strength is 0.2, the minimum stirrup ratio of C30 recycled concrete beam is 0.17% The ordinary concrete beam increases by about 32.0%, and the bending of the recycled concrete beam can be guaranteed by increasing the reinforcement rationally, and the reliable index of shearing is consistent with the ordinary concrete beam.