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给出准静态荷载作用下钢管混凝土柱累积损伤性能研究的试验结果。研究参数有:钢管的径厚比、2种类型的填充物(素混凝土和钢纤维混凝土)。试验第1阶段采用一系列基准试验来确定变幅循环荷载作用下钢管柱的滞后性能,试验第2阶段主要研究恒幅循环荷载作用下荷载大小和循环次数对钢管柱累积损伤的影响,并对试验结果进行了总结。研究表明,钢纤维混凝土填充的钢管混凝土柱与素混凝土填充的钢管混凝土柱相比,其延性和能量吸收能力显著增加,损伤指数降低。给出预测填充柱累积损伤指数的简单公式,该指数可以对新的和已有的填充柱进行地震安全评估。
The experimental results of cumulative damage behavior of CFST columns under quasi-static load are given. The research parameters are: diameter-thickness ratio of steel pipe, two types of filler (plain concrete and steel fiber reinforced concrete). In the first phase of the test, a series of benchmark tests were used to determine the hysteresis behavior of steel pipe columns under cyclic load. In the second phase of the experiment, the effect of load and cycle number on the cumulative damage of steel pipe columns under constant amplitude cyclic loading was studied. The test results are summarized. The results show that the ductility and energy absorption capacity of steel fiber reinforced concrete filled CFST columns are significantly higher than those of plain concrete filled CFST columns, and the damage index is decreased. A simple formula for predicting the cumulative damage index of packed columns is given, which can be used to assess the seismic safety of new and existing packed columns.