中文摘要：

进行了6个1/3比例梁高不等的钢筋混凝土中节点试件的低周反复荷载试验,分析了该类中节点的破坏特点和骨架曲线等力学性能;在试验研究的基础上,建立了考虑梁高不等特性的中节点的等效核心区在压剪复合作用下的计算模型,应用改进斜压场理论（MCFT）对等效核心区进行了受力分析。研究表明：该类节点通裂荷载与极限荷载比较接近,初裂出现在小梁上柱组成的小核心区,最终破坏区域主要发生在大梁下柱组成的大核心区;作为梁柱组合体而言,该类非常规节点抗震耗能能力较差;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。

英文摘要：

Six specimens of interior joints of beams with different depth were tested under reversed cyclic loadings. The failure characteristics and shear force versus shear angle skeleton curves of interior joints are analyzed. Based on the experimental study, an analytical model for equivalent joint core of an abnormal joint under the combined action of an axial load and a shear is established, and the shear stress versus shear angle curves of the equivalent joint core of tested specimens were calculated by using modified compression field theory （MCFT）. Test results indicated that the first crack appeared in the minor core （determined by the low beam and the top column）, and the final failure appeared in the large core （determined by the high beam and the bottom column）. The critical crack load was quite nearly with the ultimate load of abnormal joints, and aseismic behavior of the beam-column joint sub-assemblage was poorer than that of ordinary joints. A good agreement between experimental results and prediction results is achieved.