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为研究再生混凝土梁的剪扭复合受力性能,以扭剪比和再生粗骨料取代率为试验参数,通过自行设计加载装置进行了7根再生混凝土梁的静力加载试验,观察试件的受力过程和破坏形态,分析不同设计参数对试件剪扭复合受力性能的影响。研究结果表明:再生混凝土梁的破坏形态与普通混凝土梁相近,随着扭剪比的增加,试件的破坏形态逐渐由受剪破坏向受扭破坏过渡;随着再生粗骨料取代率的增加,再生混凝土梁的初始抗扭刚度和开裂荷载均有所降低,同时破坏时的脆性特征明显,但承载力降幅不大;GB 50010—2010《混凝土结构设计规范》中公式可用于计算再生混凝土梁剪扭复合承载力。
In order to study the shear-torsion composite behavior of recycled concrete beams, the torsional shear ratio and the replacement ratio of recycled coarse aggregate were used as the experimental parameters. Static loading tests of seven recycled concrete beams were carried out by means of self-designed loading device. Stress process and failure mode, and analyze the influence of different design parameters on shear strength and torsional stress of specimens. The results show that the failure mode of recycled concrete beam is similar to that of ordinary concrete beam. With the increase of torsional shear ratio, the failure mode of specimen gradually changes from shear failure to torsional failure. With the increase of replacement rate of recycled coarse aggregate, , The initial torsional stiffness and cracking load of recycled concrete beams are reduced, while the brittleness characteristics of the failure are obvious, but the bearing capacity does not decline significantly; GB 50010-2010 “Concrete Structure Design Code” in the formula can be used to calculate the recycled concrete beam Shear twist composite bearing capacity.