钢管混凝土偏压格构柱长细比影响试验研究

进行了钢管混凝土格构柱偏心受压试验,试验参数为长细比。介绍了试验的情况和过程,对柱肢钢管纵向应变、环向应变、缀管的纵向应变等进行了分析。研究结果表明,随长细比的增加,钢管混凝土格构柱的极限承载力逐渐降低。柱肢以受轴压为主,属于小偏压构件。近载侧的柱肢在试件进入非线性后紧箍效应开始发生作用。缀管的受力较小且都处在弹性阶段。受缀管的影响,节点处柱肢钢管环向应变很大,它是引起柱肢钢管撕裂从而导致试件破坏的主要原因。

Experimental study on influence of slenderness ratio in concrete filled steel tubular laced columns under eccentric compression

Eccentrically loaded concrete filled steel tubular(CFST) laced columns were tested with slenderness ratio as main experimental parameter.Detailed strain measurement and analysis were conducted for the longitudinal elements and the lacing tubes.Test results indicate that the ultimate load carrying capability of the CFST laced columns compressed eccentrically reduces with the increase of slenderness ratio.The compression force dominates the loading condition in the longitudinal elements and thus they can be considered as eccentrically loaded column with small eccentricity.The circumferential straining takes effect in longitudinal elements on the loading side after the specimen enters nonlinear phase.During the loading,the lacing tubes remained in elastic stage.It was observed that complicated and excessively large strains existed near the nodes of the longitudinal elements and the lacing tubes,which initiated the tearing of the tube walls and eventually resulted the total failure of the member.