根据10个梁高不等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结果,重点分析了该类框架中节点的破坏过程和破坏特点。在试验研究的基础上,通过建立平衡方程、运动方程和物理方程对框架节点进行受力分析,建议了考虑梁高不等特性的中节点等效核心区的简化计算模型,并应用该模型对变梁中节点进行受力分析。研究结果表明:该文建议模型计算得到的剪应力与剪切变形的关系曲线与试验结果吻合较好。 According to the test results of 10 specimens with different heights in RC frames under low cyclic load, the failure process and failure characteristics of the joints in this kind of frame are analyzed emphatically. Based on the experimental study, the mechanical analysis of the frame joints is carried out by establishing the balance equation, the equation of motion and the physical equations. The simplified calculation model of the equivalent core zone considering the unequal beam height is proposed. Beam in the node for stress analysis. The results show that the relationship between shear stress and shear deformation calculated by the proposed model is in good agreement with the experimental results.