对3个常用的节点核心区抗剪强度计算模型进行介绍和分析.计算结果表明：3个模型的理论计算结果的离散度较大，与试验结果不能很好地吻合.在斜压杆-桁架模型基础上，同时考虑开裂后混凝土强度软化和高强混凝土修正系数，得到一个改进的节点核心区抗剪强度计算模型.改进模型的计算结果与试验结果很接近，离散度小，且偏于安全，适用于普通混凝土节点及高强混凝土节点的极限抗剪强度计算.

In this paper, three existing models for calculating the shear strength of the core of beam-column joint are introduced and analyzed. Calculated results show that the theoretical results do not match experimental results, with considerable dispersion. Based on the strut and truss model, a modified model is proposed, in which a softening coefficient of cracked concrete and a correction coefficient for high concrete joints are considered. Results of the modified model are close to experimental results, and are safe. The modified model can be applied to normal and high strength reinforced concrete joints.