论文部分内容阅读
通过对3组15个不同再生粗骨料取代率、配筋率的梁在集中荷载作用下进行抗弯性能试验研究,分析再生骨料取代率对再生混凝土梁满足平截面假定、挠度变形、裂缝宽度以及极限承载力等方面的影响,同时对现行GB 50010—2002《混凝土结构设计规范》中混凝土正截面极限承载力计算公式计算再生混凝土梁极限承载力的适用性进行探讨。研究结果表明:在同级荷载作用下,再生混凝土梁较天然混凝土梁裂缝开展快、裂缝最大宽度大、抗弯刚度降低快;在逐级加载过程中无论再生粗骨料取代率大小,再生混凝土梁正截面混凝土应变变化仍满足平截面假定要求;按现行规范公式计算再生混凝土梁的极限承载力是可行的,但缺少相应的再生骨料取代率影响因子,针对此问题提出建议公式与调整系数,并通过数据分析证明其满足基本要求。
The bending performance of 15 beams with 15 different recycled coarse aggregates with different replacement and reinforcement ratios was studied under concentrated load. The effects of recycled aggregate ratio on the assumption of flat section, deflection, Width and ultimate bearing capacity. The applicability of calculating formula of ultimate bearing capacity of normal section of concrete in GB 50010-2002 “Design Code of Concrete Structure” is also discussed. The results show that under the same load, the recycled concrete beam develops faster than the natural concrete beam, the maximum width of the crack is large, and the flexural rigidity decreases rapidly. No matter the replacement rate of recycled coarse aggregate, the recycled concrete It is feasible to calculate the ultimate bearing capacity of recycled concrete beams according to the existing normative formulas, but there is no corresponding factor for the replacement rate of recycled aggregate concrete. Proposing formulas and adjusting factors for this problem are proposed , And through data analysis proved that it meets the basic requirements.