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为了研究钢筋再生混凝土梁的受力性能,设计并制作了6根钢筋再生混凝土梁试件,进行静力单调加载试验,观察不同剪跨比下钢筋再生混凝土梁的破坏过程及破坏形态,绘制出荷载-变形、荷载-应变等关系曲线,分析了再生粗骨料取代率、剪跨比对试件极限承载力的影响;采用规范公式计算试件极限承载力和刚度并与试验值进行对比分析。结果表明:再生混凝土梁与普通混凝土梁破坏过程和形态相似,根据剪跨比的不同,表现为剪切斜压和弯曲破坏两种形态;随着再生粗骨料取代率的增加,试件的极限承载力略有降低,而随着剪跨比的增大,极限承载力则显著降低;现行混凝土规范方法可适用于钢筋再生混凝土梁的极限承载力及短期刚度计算。
In order to study the mechanical properties of reinforced concrete beams, six specimens of recycled concrete beams were designed and fabricated. Static and monotonic loading tests were carried out to observe the failure process and failure modes of recycled concrete beams with different shear-span ratios. Load-strain curve and load-strain curve, the influence of recycled coarse aggregate substitution rate and shear span ratio on the ultimate bearing capacity of the specimen is analyzed. The ultimate bearing capacity and stiffness of the specimen are calculated by the standard formula and compared with the experimental values . The results show that the failure process and morphology of recycled concrete beams are similar to that of ordinary concrete beams. According to the different shear-span ratios, the two forms show shear baroclinic and bending failure. With the increase of the replacement rate of recycled coarse aggregate, The ultimate bearing capacity decreased slightly, but with the increase of shear span ratio, the ultimate bearing capacity decreased significantly. The current concrete method can be applied to the ultimate bearing capacity and short-term stiffness calculation of reinforced concrete recycled beam.