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基于6个钢筋混凝土框架异型中节点试件的试验研究,分析了节点核心区尺寸、轴压比等因素对异型中节点抗裂性能的影响。结果表明:节点开裂前核心区混凝土基本处于弹性工作阶段,异型中节点的剪力主要由小核心(小梁与上柱构成的区域)混凝土承担,增大轴压比可以提高异型中节点试件的抗裂承载能力。在试验研究的基础上,提出异型中节点抗裂承载力计算公式,并与11个异型节点试件的试验结果进行对比,吻合较好。
Based on the experimental study of six deformed specimens of RC frame, the influence of core size, axial compression ratio and other factors on the crack resistance of special shaped joints was analyzed. The results show that the concrete in the core zone before node cracking is basically in the elastic working stage. The shear stress in the special shaped nodes is mainly borne by the small core (the area formed by the trabecular and the upper column) concrete. Increasing the axial compression ratio can improve the joint specimens Crack resistance carrying capacity. Based on the experimental study, the calculation formula of the crack resistance capacity of the special shaped joints is put forward and compared with the test results of 11 special shaped joints, which is in good agreement.