装配式钢管混凝土柱梁下栓上焊节点抗震性能试验

为了解决节点对装配式钢管混凝土结构整体抗震性能影响的问题，本文提出了一种新型装配式钢管混凝土柱梁下栓上焊节点方法，为研究其抗震性能，设计并进行了3个下栓上焊节点和1个全螺栓节点的拟静力试验.结果表明:3个下栓上焊节点主要由于梁端屈曲及钢梁翼缘延性断裂导致构件破坏，节点的滞回曲线饱满，耗能能力、刚度退化能力、承载力退化能力良好，表现出接近全螺栓节点的抗震性能.相比于JD1，梁截面尺寸增大后JD3的峰值荷载、刚度及耗能能力有了明显提高，贴板厚度增加后节点的抗震性能并无显著改变.

Experimental Study on Seismic Performance of Bottom-Flange-Bolted and Top-Flange-Welded Prefabricated CFST Column to Steel Beam Joints

In order to solve the problem of the influence of the joint on the overall seismic performance of the prefabricated concrete-filled steel tube (CFST) structure， this paper proposed a new type of the bottom-flange-bolted and top-flange-welded prefabricated CFST column and steel beam joints. To study its seismic performance， three bottom-flange-bolted and top-flange-welded joints and one full bolt joint were designed and tested. The results show that the failure modes of the three bottom-flange-bolted and top-flange-welded joints are mainly caused by the buckling of the beam end and the ductile fracture of the steel beam flange， the hysteretic curve of the joint is full， the energy dissipation capacity， stiffness degradation capacity and bearing capacity degradation capacity are good， and showing the seismic performance is close to that of the full bolt joint. Compared with JD1， the peak load， stiffness and energy dissipation capacity of JD3 are significantly improved with the increase of the beam section size， and the seismic performance of the joint is not significantly changed with an increase in the thickness of the plate.