T形钢管混凝土柱-带楼板钢梁框架节点地震损伤试验研究

Experimental study on seismic damage of T⁃shaped concrete filled steel tubular column and steel beam frame joint with floor slab

为研究T形钢管混凝土(CFST)柱-带楼板钢梁框架节点抗震性能,制作了6个不同梁柱线刚度比和轴压比的T形CFST柱与带楼板钢梁框架节点试件,并进行了低周往复加载试验。试验结果表明,试件在高轴压比下延性和耗能能力明显下降,刚度和骨架曲线基本不变;随着梁柱线刚度比提高,试件的刚度减小,延性和耗能能力先下降后上升;楼板对试件正向加载时的抗震性能有一定提高,负向加载时的影响很小;所有试件的滞回曲线均为较饱满的梭形且各试件的平均等效阻尼系数为0.270远大于普通钢筋混凝土节点试件,说明T形CFST柱-带楼板钢梁框架节点具有较好的抗震性能。

In order to study the seismic performance of T⁃shaped concrete⁃filled steel tubular(CFST)column⁃steel beam frame joints with floor,six T⁃shaped CFST column⁃steel beam frame joints with different beam⁃column linear stiffness ratios and axial compression ratios are fabricated and tested under low cyclic loading.The test results show that the ductility and energy dissipation capacity of the specimens decrease significantly under high axial compression ratio,and the stiffness and skeleton curve are basically unchanged.With the increase of beam⁃column linear stiffness ratio,the stiffness of the specimen decreases,and the ductility and energy dissipation capacity decrease first and then increase.The slab has a certain improvement on the seismic performance of the specimen under positive loading,and has little effect under negative loading.The hysteretic curves of all specimens are plump spindle and the average equivalent damping coefficient of each specimen is 0.270,which is much larger than that of ordinary reinforced concrete joint specimens,indicating that the T⁃shaped CFST column⁃steel beam frame joint with floor slab has good seismic performance.