焊接封闭箍筋混凝土柱抗震性态指标试验研究

An experimental study on the seismic performance of welded closed stirrup concrete columns

通过12根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:随着剪跨比的不断增大,焊接封闭箍筋混凝土柱的水平承载能力不断减小;试件的承载能力及位移延性随着轴压比的增大而增大;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;建议了焊接封闭箍筋混凝土柱满足运行、基本运行、可修及避免倒塌等四个抗震性能水平的位移角限值分别取1/250,1/200,1/50和1/25。研究成果可为焊接封闭箍筋混凝土柱的地震反应分析和工程应用提供参考。

Through low cyclic horizontal loading tests on12welded closed stirrup concrete columns,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,with the increase of the shear span ratio,the ultimate bearing capacity of the specimen decreases.With the increase of the ratio of axial compression,the bearing capacity and ductility of the specimen increases.With the increase of the volume-stirrup ratios,the ultimate bearing capacity of the specimen increases,the ductility and energy dissipation capacity increases also.A series of drift limit for the four different seismic performance level are recommended based on the test results.