GFRP套管混凝土长柱轴压力学性能试验

Experimental study on mechanical properties of concrete filled GFRP tubular long columns under axial loading

为了研究GFRP套管混凝土长柱的轴压力学性能,对9根不同长细比的组合长柱进行了试验研究。对试件的破坏特征、轴向应变、荷载峰值、柱挠度变化、柱中截面应变方面进行了比较。试验结果表明:随长细比的增加,GFRP套管柱的力学特征发生了很大的改变,逐渐由强度破坏转变为失稳破坏;同时,GFRP套管柱与传统的钢筋混凝土长柱在力学性能上表现出很大的不同,主要表现在当组合长柱达到峰值应力时,所有试件的纵向钢筋均已屈服,发生了非弹性失稳破坏,且其峰值荷载下降的幅度远高于普通混凝土长柱。

In order to study mechanical properties of concrete filled GFRP tubular long columns under the axial loading,experimental study on nine different slenderness ratios was carried out.Axial failure characteristics,axial strain,peak load,deflection along the column,cross-section strain in the middle of the column,were compared.The results show that with the increasing of slenderness ratio,the mechanical properties of the composite long columns have significant change and the failure mode is gradually converted from strength failure to instability failure.The mechanical properties are very different between the GFRP composite long column and the RC column.When the composite long columns reach their peak stress,longitudinal reinforcements yield and non-elastic instability failune are occurred.The decline rate of the peak loads of the composite long columns is much higher than that of RC columns.