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为研究箍筋强约束钢筋混凝土柱的抗震性能,完成了6个配箍特征值0.34~0.44、截面尺寸450mm×450mm的大尺寸钢筋混凝土柱试件的拟静力试验研究。结果表明,试件的破坏形态为压弯破坏,纵筋压曲甚至断裂,部分试件箍筋拉断,底部1倍柱截面高度范围内混凝土保护层剥落,箍筋约束核心区混凝土局部压碎。试件水平力-位移滞回曲线饱满,极限位移角达到1/39~1/33,延性系数均大于3.0。对于箍筋强约束柱,改变箍筋形式或改变箍筋肢距,对其正截面承载力及极限变形能力影响不大;相同位移往复加载由3次增加至5次,对其正截面承载力及峰值位移影响不大,但变形能力降低约15%。
In order to study the seismic behavior of reinforced concrete columns with strong confinement, six quasi-static tests on large-size RC columns with characteristic values of 0.34 ~ 0.44 for hoop and 450mm × 450mm for cross-section were completed. The results show that the failure modes of specimens are buckling failure, buckling and even rupture of longitudinal reinforcement. Some specimens stirrups tend to break, the concrete protective layer peels off in the height range of 1 column at the bottom, . The horizontal force-displacement hysteresis curve of the specimen is full, the ultimate displacement angle reaches 1 / 39-1 / 33, and the ductility coefficient is greater than 3.0. For columns with strong stirrups, changing the stirrups or changing the stirrups limbs have little effect on the ultimate bearing capacity and ultimate deformation capacity of the stirrups. The reciprocating loading of the same displacement increases from 3 times to 5 times, And the peak displacement has little effect, but the deformation capacity reduced by about 15%.