方钢管混凝土柱-H型钢梁全螺栓隔板贯通式节点弯矩-曲率滞回模型研究

Research on hysteretic model of moment-curvature for all-bolts and clapboard-through joint connecting concrete-filled square steel tubular column and H-shaped steel beam

为了进一步研究方钢管混凝土柱-H型钢梁全螺栓隔板贯通式节点的力学性能及其在地震作用下的滞回特性,对4个足尺的节点试件进行了低周往复荷载试验。通过对试验数据的分析与拟合,提出了方钢管混凝土柱-H型钢梁全螺栓隔板贯通式节点三折线骨架模型及试件的刚度退化规律,确定了该节点的弯矩-曲率滞回模型,最后利用试验数据对该模型进行验证。结果表明,该滞回模型具有计算公式简单、易于掌握、计算精度较高等优点,能够充分反映该节点的承载力变化、刚度退化和滑移变形,此外该模型对研究变量进行了无量纲化处理,避免了数量级带来的麻烦,便于实际应用。

In order to further study the mechanical properties and hysteresis characteristics under the seismic load of allbolts and clapboard-through joint connecting concrete-filled square steel tubular column and H-shaped steel beam,the low cyclic loading test on four full-scale joint specimens was carried out. By analyzing and fitting the test data,a tri-linear skeleton curve model and the stiffness degradation rule of the hysteretic curves of the joint were proposed. The bending moment-curvature hysteretic model of the joint was determined and the model was verified by test data. Results show that the model has better calculation formula which is simple,higher accuracy and easier to master. The model can fully reflect the bearing capacity of the hysteresis curve,stiffness degradation,slip deformation. In addition,the coordinate of the model is dimensionless,which can rule out some troubles such as magnitude orders and make it easy to apply.