( 2 ) based on deterioration model of owerage bond stress of beam reinforcement accounting for effect of axial compression ration and number of displacement loops , and stress - strain relationship of the concrete in the joint core accounting for effects of both softening and confinement , the modified compression field theory was employed to simulate behavior of the joint core under loading reversals . analysis by means of the program jap on the tested specimens in this paper and those obtained from other researchers produced consistent results 根据本文建立的考虑轴压比和位移循环次数影响的梁筋平均粘结应力退化模型和考虑软化效应、约束效应的核心区混凝土应力应变关系，通过在试验中得出的节点核心区混凝土、箍筋、节点正面、背面柱筋在反复荷载下的受力特点，利用斜压场理论模拟节点核心区在反复受力过程中的受力状态。
