内置钢骨的L形截面钢管混凝土中长柱轴心受压试验研究  

Experimental Research on Axially Loaded Composite L-section Steel Tubes of Middle Long Columns Filled with Steel-reinforced Concrete

作　　者：杜国锋[1] 宋鑫 张志忠[1] 余思平[1] 

机构地区：[1]长江大学城市建设学院,湖北荆州434023 [2]中建五局第三建设有限公司,湖南长沙410004

出　　处：《四川大学学报（工程科学版）》2013年第5期43-50,共8页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51378077);湖北省科技计划资助项目(2010CDZ003)

摘　　要：内置钢骨的组合异形截面钢管混凝土柱是一种新型重载组合柱。为了解此类构件的轴压稳定承载力,以内置钢骨的L形截面钢管混凝土柱为研究对象,考虑配箍率、配骨率和长细比等参数的影响,进行17个试件轴压试验。分析试件的受力过程,实测试件的荷载-平均纵向应变曲线(N-εl)、荷载-挠度曲线(N-δ)和极限抗压承载力,研究各参数对试件轴心受压力学性能的影响。试验结果表明:组合柱轴压变形为"S形",主要破坏形态为柱端局部屈曲破坏;随着长细比增加,试件极限承载力逐渐减小,配箍率和配骨率是决定试件极限承载力的关键因素;参考国内外相关规范的计算条文,提出内置钢骨的L形截面钢管混凝土柱轴心受压稳定性承载力的实用计算公式,计算结果与试验吻合良好。Special-section steel tube column filled with steel-reinforced is a new type heavy-load composite columns. To investigate the axial compression stability mechanical property of this component,seventeen slender L-section steel tube columns filled with steel-reinforced were tested. The primary test parameters were the slenderness ratios,section steel index and confinement index. The loading process was analyzed,the load-average longitudinal strain curves,load-deflection curves,ultimate bearing capacity of the specimens were tested,and the influences of parameters on the axial load behavior were studied. The experimental results showed that the main failure modes of specimens are steel tube buckling on the end of specimens. With the increase of slenderness ratios,the ultimate bearing capacity of the columns decreases. The section steel index and the confinement index are the key factors effecting the ultimate bearing capacity. Based on the conclusions of domestic and abroad codes,the formula about stability bearing capacity under axial compression of L-section steel tube columns filled with steel-reinforced concrete was deduced. The calculated values agreed well with the experimental results.

关 键 词：钢骨混凝土 钢管混凝土 组合柱 异形柱 中长柱 

分 类 号：TU398.9[建筑科学—结构工程]