焊接封闭箍筋混凝土柱抗震性能试验

Experimental on the Seismic Behavior of Welded Closed Stirrup Concrete Columns

通过9根不同轴压比及配箍率下焊接封闭箍筋混凝土柱的低周反复加载试验,对其破坏形态、滞回曲线、骨架曲线、延性、耗能性能、刚度退化及强度衰减等抗震性能指标展开系统分析。结果表明:各试件滞回曲线较为饱满,捏缩现象较轻,表现出较好的延性及耗能性能;试件的承载能力及延性随轴压比的增大而增大,但刚度和强度退化较快;随着配箍率的提高,柱的承载能力,延性及耗能能力均有所提高,但后期强度和刚度退化较为明显,建议焊接封闭箍筋的间距不宜小于50 mm。

Through low cyclic horizontal loading tests about 9 welded closed stirrup concrete columns which based on different axial compression ratios and volume-stirrup ratios, the failure patterns, hysteresis curves, the skeleton curves were measured, and the ductility ratios, energy dissipation capacity, strength degradation ratio were analyzed as well. The results show that, all hysteretic curves of concrete columns with welded confined stirrups are full with little pinch phenomenon. Ductility and energy dissipation of the columns are good. With the increase of the ratio of axial compression, the beating capacity and ductility of the specimen increases, but the stiffness and strength degrade rapidly. With the increase of the volume-stirrup ratios, the ultimate beating capacity of the specimen increases, and the ductility and energy dissipation capacity increases also, but the stiffness and strength degrade rapidly. The welding closed stirrup spacing should not be less than 50 mm was suggested.