【摘要】 为研究钢骨—T形钢管混凝土长柱轴心受压力学性能,对16根长细比为16<λ<43的钢骨—T形钢管混凝土柱进行轴心受压试验,研究试件破坏形态和工作机理,得到试件的荷载—纵向位移曲线、荷载—应变曲线以及荷载—挠度曲线。通过分析套箍指标、配骨指标和长细比等参数对试件轴心受压力学性能的影响,以及对比试件极限承载力的试验值和理论计算值,提出钢骨—T形钢管混凝土长柱轴心受压稳定系数计算方法,进而推出极限承载力计算公式。研究结果表明:内置工字型钢骨的T形截面钢管混凝土柱具有较好的延性;钢管、混凝土和钢骨三者能很好地协同工作,改善了核心混凝土的脆性破坏性质,使组合柱的承载力显著提高;所提出的试件极限承载力计算公式可供工程设计参考。更多还原

【Abstract】 In order to study the mechanical properties of steel bone T-shaped concrete-filled steel tubular long columns under axial compression,an experimental analysis on 16 specimens with the slenderness ratio of 16<λ<43 under axial compression was carried out.The failure modes and work mechanism were studied,and curves of load-longitudinal displacement,load-strain and load-deflection of the specimen were obtained.By analyzing the effects of hoop index,bone index,slenderness ratio and other parameters on the mechanical property of the specimens under axial compression and comparing the experimental value of the specimen’s ultimate bearing capacity with the theoretical value,the computational method of stability coefficient of the steel bone T-shaped concrete-filled steel tubular long columns under axial compression is proposed.The research results show that T-shaped concrete-filled steel tubular columns embedded with the "H" shaped steel bones have good ductility;steel tube,concrete and steel bone can work collaboratively,which improves the brittle failure properties of the core concrete and the bearing capacity of the composite column.The formula could be valuable for engineering design.更多还原