蜂窝梁-实腹柱十字形节点受力性能研究

为研究蜂窝梁-实腹柱框架中节点的受力性能，利用ABAQUS有限元软件对28种不同扩高比和开孔位置的蜂窝梁-实腹柱十字形节点足尺模型进行了数值模拟分析，详细研究了蜂窝梁-实腹柱十字形节点的破坏模式、塑性铰产生位置、滞回曲线、骨架曲线、延性性能和耗能能力。结果表明:蜂窝梁-实腹柱十字形节点由于梁上开孔的削弱作用，塑性铰由节点域向梁上第1个孔洞处转移，避免在节点域破坏，具有良好的抗震性能；蜂窝梁第1开孔位置一定时，随着扩高比K增加，节点水平承载力先增加后降低，并在K=1.4左右时达到峰值；扩高比K一定时，随着梁上第1个孔洞中心距柱距离L的增大，节点水平承载力先增加后趋于稳定；综合考虑扩高比K和开孔位置L对节点水平承载力及塑性铰产生位置的影响，并定义参数α_h，给出参数K和α_h的建议合理取值范围；在此取值范围内，蜂窝梁 实腹柱十字形节点水平承载力较高，滞回曲线饱满，具有良好的延性与耗能能力，且塑性铰出现在梁上第1个孔洞附近，满足“强节点弱构件”的抗震设计要求，具有良好的抗震性能。

Study on Mechanical Behavior of Castellated Beam-solid Column Cruciform Joints

In order to study the mechanical behavior of castellated beam-solid column frame middle joints, 28 types of full-scale castellated beam-solid column cruciform joints(CSCJ) with different expansion ratios and hole locations were analyzed by ABAQUS finite element software. The failure modes, plastic hinge positions, hysteresis curves, skeleton curves, ductility and energy dissipation capacities of CSCJ were studied in detail. The results show that the plastic hinge of CSCJ is transferred from the node zone to the location of the first hole on the beam due to the weakened effect of the hole. The damage of node zone is avoided and the joint has good seismic performance. When the location of the first hole remains constant, the horizontal bearing capacity of CSCJ increases firstly and then decreases with the increasing of expansion ratio K. The horizontal bearing capacity reaches the peak value near K=1.4. When the expansion ratio K remains constant, the horizontal bearing capacity of CSCJ increases firstly and then tends to be steady with the increasing of the distance L between the first hole on the beam and the column. Considering the influences of the expansion ratio K and the location L of the hole on the horizontal bearing capacity and the locations of plastic hinges of CSCJ, the parameter α_h=L/h is defined, and the reasonable ranges of K and α_h are proposed. Within this range of value, the CSCJ has high horizontal bearing capacity, full hysteresis curve, good ductility and energy dissipation capacity, and the plastic hinge of CSCJ appears near the location of the first hole on the beam so that the CSCJ satisfies the seismic requirements of strong joints and weak members and has good seismic performance.