焊接箍筋混凝土框架柱抗震性能试验研究

Experimental study on seismic performance of reinforced concrete frame columns with welding stirrups

通过4个绑扎箍筋钢筋混凝土柱和5个焊接箍筋钢筋混凝土柱的低周反复水平加载试验,对比了焊接箍筋形式和绑扎箍筋形式对钢筋混凝土柱抗震性能的影响,探讨了焊接箍筋钢筋混凝土柱在抗震方面的性能,试验研究结果表明,焊接箍筋混凝土柱比绑扎混凝土柱的抗震性能有所提高.根据试验结果,分析焊接箍筋钢筋混凝土柱的滞回曲线和骨架曲线,得出不同轴压比和配箍率对焊接箍筋钢筋混凝土柱的耗能能力、延性性能和刚度退化的影响.在低周反复荷载下,焊接箍筋钢筋混凝土柱随着轴压比的降低,耗能能力增强,位移延性增大;在轴压比相同的条件下,耗能能力和位移延性随着配箍率的增大而增大.

Through low cyclic horizontal loading tests about the four reinforced concrete column with tie stirrup and five with welding stirrups, the effects of welding stirrups and tie stirrups on the seismic performance of reinforced concrete columns have been compared, and the performance of welding stirrups confined reinforced concrete columns in the earthquake have been explored. According to test results, this paper analyzed the hysteresis curves and skeleton curves about welding stirrups confined reinforced concrete columns. The influence of energy dissipation, ductility performance and stiffness degradation about welding stirrups confined reinforced concrete columns at different axial compression ratios and stirrup ratios are derived. Under the low reversed cyclic loading, to welding stirrups constraint reinforced concrete columns, the energy dissipation capacity enhancement and displacement ductility will increase as the axial compression ratios decreased. At the same axial compression ratio, the energy dissipation capacity and displacement ductility increased with the stirrup ratios.