方钢管高强混凝土偏压短柱试验研究

以偏心率和混凝土强度为参数,对8根方钢管高强混凝土偏压短柱进行试验研究.结果表明:偏压短柱具有较好的弹塑性工作性能;偏心率和混凝土强度对构件的承载力均有影响,但偏心率的影响更为显著,随偏心率增大,紧箍力对提高混凝土强度的作用随之减弱,构件的承载力也明显降低,承载力的降低与偏心率的增加不呈线性关系;混凝土强度对承载力的影响与偏心率有关,当偏心率小于0.5时,提高混凝土强度可以明显提高构件的承载力,当偏心率大于0.5时,混凝土强度对构件承载力的影响较小.

Research of high strength concrete-filled square steel tubular short columns subjected to eccentric compression

This paper presents an experimental research of 8 high strength concrete-filled square steel tubular columns(CFSST)subjected to eccentric compression.The analysis suggests positive effect of eccentric ratio and concrete strength on the behavior of CFSST columns under eccentric compression.The results indicate that the CFSST columns subjected to eccentric load have preferable performance of elasticity and plasticity.Both eccentricity ratio and concrete strength would affect the ultimate load,but the effect of eccentric ratio is more significant.With the increase of eccentric ratio,the effect of confinement force enhancing concrete strength as well as the ultimate load of CFSST columns will decrease.The increment of eccentric ratio is nonlinear with the decrease of ultimate load.The influence of concrete strength on the ultimate load relates to eccentric ratio,when eccentric ratio is below 0.5,the increase of concrete strength will improve the ultimate load greatly;and when eccentric ratio is above 0.5,the influence of concrete strength on ultimate load is small.