开展了6个横截面宽度为800 mm的方钢管混凝土短柱在恒定轴力和水平往复荷载作用下的加载试验，分析了钢管约束作用（宽厚比B/t=50、80和100）对足尺短柱破坏形态、滞回性能、延性性能、刚度退化和耗能能力等抗震性能的影响规律。得到如下结论：1）本试验中，所有足尺方钢管混凝土短柱均发生压弯破坏，即在柱底部出现钢管环状鼓曲、核心混凝土压碎行为；2）方钢管混凝土柱的延性能力随着宽厚比的减少（约束作用提升）并无明显改变，且足尺柱的延性能力明显低于已有试验中的小尺寸柱；3）宽厚比对足尺方钢管混凝土柱的刚度退化和等效粘滞阻尼系数影响不大；但柱的总耗能随宽厚比的减小而增大；4）随着宽厚比的减小，钢管约束效应提升，柱压弯承载力有所提高，但提高的幅度明显小于相关规范值。另外，与现有中、美、欧等设计规范计算结果对比发现，中国规范和欧洲规范的计算结果偏大，美国规范计算结果则较为保守。
Abstract
Six full-scale square concrete filled steel tubular (CFST) stub columns with the cross-sectional width of 800 mm were tested under constant axial loading and cyclic lateral loading. With the increase of the width-to-thickness ratios B/t of 50, 80 and 100, the influence of the confinement effect provided by steel tube to core concrete on the failure mode, hysteretic behavior, ductility, stiffness, and energy dissipation of the CFST columns was investigated. It can be found that 1) the failure mode of all specimens was the compression-flexural failure with the local buckling of steel tube and the crushing of core concrete at the bottom of the columns. 2) With the decrease of the width-to-thickness ratio (the confinement effect improved) the influence of the ductility of columns is not significant, and comparison with the scale columns, the ductility performance of the full-scale columns decreases obviously. 3) The effect of the width-to-thickness ratio on the stiffness degradation and energy dissipation of the full-scale columns is not significant, and with the decrease of width-to-thickness ratio, the cumulative energy of the specimen increases. 4) As the width-to-thickness ratio decreases with the increase of the confinement effect, the compression and flexural capacity increases, but the increased extent of the compression and flexural capacity is smaller than that of the current codes. In addition, according to the current design codes of China and Europe, the predicted values are large than that of experimental values of the full-scale CFST column. The calculated formulas in the code of America is very conservative.
关键词
方钢管混凝土短柱 /
约束效应 /
宽厚比 /
抗震性能 /
承载力
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Key words
square CFST stocky column /
confinement effect /
width-to-thickness ratio /
seismic performance /
bearing capacity.
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