偏心率对钢管轻集料混凝土受压性能的影响  

Impact of eccentricity ratio on behavior of lightweight aggregate concrete filled steel tube columns under eccentricity compression

作　　者：傅中秋[1] 吉伯海[1] 马麟[1] 袁爱民[1] 

机构地区：[1]河海大学土木与交通学院,南京210098

出　　处：《东南大学学报（自然科学版）》2010年第3期624-629,共6页Journal of Southeast University：Natural Science Edition

基　　金：江苏省自然科学基金资助项目(BK2008359);江苏省普通高校研究生科研创新计划资助项目(CX09B-159Z)

摘　　要：为了研究钢管轻集料混凝土构件偏心受压状态下的受力性能特征,对长细比为12,28,56等共54根不同偏心率的钢管轻集料混凝土偏心受压柱的试验结果进行了分析.通过构件的荷载、挠度、应力和应变等特征曲线,研究了构件破坏的过程特征,分析了偏心率对受压性能的影响机理.试验结果表明:偏心率越大,钢管轻集料混凝土构件的纵向应变发展越快;在破坏时,截面受压区高度随着偏心率的增大而减小,中和轴逐渐向偏心一侧移动;钢管轻集料混凝土的承载力随着偏心率的增大而减小,延性随着偏心率的增大而增大;偏心与稳定对钢管轻集料混凝土的承载力影响相互独立,其承载力折减系数可以由偏心折减系数乘以稳定系数得到.基于以上分析,给出了钢管轻集料混凝土的偏心折减系数计算公式,计算结果与试验结果吻合良好.The performance characteristics of lightweight aggregate concrete filled steel tube（LACFST） columns under eccentric loading are studied by the test results from 54 specimens with slenderness ratios of 12,28,56 in different eccentricity ratios.The load,deflection,stress,strain and the destruction processes are analyzed to study the impacts of the eccentricity ratios on the mechanism.Test results show that the longitudinal strain grows more quickly and the cross-section heights of compression zones decrease when the specimens are damaged as the eccentricity increases.At the same time,the neutral axis gradually moves to the eccentric side.LACFST bearing capacity decreases and ductility enlarges as the eccentricity increases.The impacts of eccentricity and stability on bearing capacity of LACFST are independent of each other.The reduction coefficient can be calculated with the eccentricity reduction coefficient multiplied by the stability coefficient. Based on these,formulae are given to calculate the eccentricity reduction coefficient of LACFST.They are in good agreement with the experimental results.

关 键 词：钢管轻集料混凝土 偏心率 承载力 折减系数 

分 类 号：TU398[建筑科学—结构工程]