蜂窝状钢骨混凝土L形柱抗震性能的试验研究

Experimental study on seismic behavior of honeycomb steel-reinforced concrete L-shaped column

为了考察轴压比对蜂窝状钢骨混凝土L形柱抗震性能的影响,本文进行了3根不同轴压比的蜂窝状钢骨混凝土L形柱的低周往复水平荷载试验,研究了该L形柱的破坏形态、滞回特性、延性、黏滞阻尼系数等抗震性能。研究表明:蜂窝状钢骨能增强钢骨与混凝土间的黏结能力,提高其协同工作与整体受力性能。蜂窝状钢骨的存在,延缓了L形柱的刚度退化,提高了延性,增强了结构的耗能能力及抗震性能。轴压比对该新型构件的破坏形态及抗震性能影响明显。随着轴压比的增大,构件的破坏形态由类似于剪切破坏向轴压破坏形态转变。轴压比越大,构件的极限承载力越大,但延性与黏滞阻尼系数越小,耗能能力越低,抗震性能越差。研究还发现,该新型构件的正、反方向承载力及延性有所差别。

In order to inspect the seismic behavior of honeycomb steel-reinforced concrete L-shaped columns with different axial compression ratios, the low cyclic reversed lateral loading tests were carried out for three honeycomb steel-reinforced concrete L-shaped columns with different axial compression ratios, and the seismic behavior such as failure mechanism, hysteretic characteristic, ductility and viscous damping of the L-shaped column was studied. The test results show that honeycomb steel can increase the adhesive force of the steel and concrete, improve the cooperation performance,increase the overall load carrying capability, and delay the stiffness degradation of the L- shaped columns, enhances the ductility, increase the energy-dissipation capacity and improve the seismic behavior of the L-shaped columns. Axial compression ratio has a significant effect on the failure mechanism and seismic behavior of the L - shaped columns. As the increase of axial compression ratio, the failure mechanism will transform from similar shearing failure to axial compressive failure. When the axial compression ratio increases, the lateral ultimate bearing capacity increases, but the ductility and viscous damping performance decreases. The experiment indicates that the ultimate strength and ductility of L - shaped column are different in positive and negative directions.