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为了研究钢筋混凝土框架变梁中节点在地震荷载作用下的受力性能及变形特点,通过10个梁高不等的钢筋混凝土框架中节点试件在低周反复荷载作用下的试验,重点分析该类中节点试件的破坏特点和层间变形能力。研究结果表明:变梁中节点通裂荷载与极限荷载接近,外荷载作用下各试件均发生了核心区剪切破坏,该类节点抗震性能较差,不能满足刚性节点设计的要求。进一步的层间变形能力分析表明,变梁中节点可以较好地满足弹性阶段的变形要求,以通裂阶段作为极限状态控制设计时不能满足弹塑性阶段的变形要求,故在节点核心区抗震验算时建议核心区抗剪强度乘以一个小于1的安全储备系数以确保整体结构的安全。
In order to study the mechanical behavior and deformation characteristics of joints in reinforced concrete frame beams under earthquake load, the test of 10 specimens with different heights in reinforced concrete frame under low cyclic loading was conducted, Destruction characteristics and interlayer deformability of specimens in joints in class. The results show that the joint failure load in the beam is close to the ultimate load, and the shear failure in the core zone occurs under the external load. The seismic performance of such nodes is poor and can not meet the requirements of rigid node design. Further analysis of interlaminar deformation shows that the joints in the beam can meet the deformation requirements of the elastic stage well, and the deformation stage can not meet the requirements of the elastic-plastic deformation stage when the crack initiation stage is used as the limit state control. Therefore, It is recommended that the core area shear strength be multiplied by a safety reserve factor of less than 1 to ensure the overall structural safety.