方钢管再生混凝土长柱轴压力学性能试验研究

Experimental study on long column axial compression performance of recycled concrete filled square steel tube

以再生骨料取代率、含钢率、长细比以及不同再生骨料种类为参数,通过试验得到了试件破坏形态、荷载—位移、荷载—应变等数据,试验结果表明:加再生砖骨料的钢管再生混凝土柱与一般钢管再生混凝土柱相比在弹性段没有差异,但在下降段轴压刚度下降较快,当砖含量为50%时承载力和刚度均下降较多,含钢率越高抵抗变形的能力越强,承载力越高。

Experimental study was carried out on long column axial compression performance of recycled concrete filled square steel tubes. With recycled aggregate replacement ratio, steel ratio, slenderness ratio and different sources of recycled aggregate as parameters, we obtained the data like specimen failure mode, load-displacement, and load-strain through the test. The experimental results showed that the elastic section of the recycled concrete filled steel tube with recycled brick aggregate had no difference compared with that of the normal concrete column, but the axial compression rigidity at dropping section decreased relatively fast. The bearing capacity and stiffness of recycled concrete filled square steel tube had a larger decrease when the brick content was fifty percent. The higher the ratio of steel, the stronger the ability to resist deformation,and the higher the bearing capacity.