部分外包混凝土加固后H型钢柱的轴压性能试验

Experiment of behavior of H-steel columns strengthened with partially encased concrete

对普通H型钢框架柱进行部分外包混凝土加固后,形成型钢部分外包混凝土组合柱(PEC柱).通过对2种截面型钢的6根PEC柱试件进行单向轴压试验,分析了3种不同的构造形式下PEC柱的荷载-位移曲线、承载能力、刚度、延性、破坏模式等力学性质.结果表明:PEC组合柱具有较高承载能力和刚度;与另外2种构造形式相比,设置了拉结筋的试件具有更高的承载能力和刚度,可以更好地约束混凝土与型钢的相对滑移,并有效地约束了H型钢翼缘的屈曲,提高了混凝土承载力的贡献效果;在框架柱中设置了拉结筋后,由于在加载过程中柱子的屈服位移增大,极限位移减小,所以其延性有所降低.

The ordinary H-steel frame columns were partially encased with concrete for strengthening to prepare Partially Encased Composite Columns(PEC Column). The uniaxial compression tests of six specimens of PEC Column with two difference cross sections were conducted,the text analysis and summarize the mechanical characteristics of load-displacement curve, bearing capacity, stiffness,ductility and damage mode were analyzed for PEC Column with three different kinds of structures. The results show that the PEC column has high load bearing capacity and stiffness. According to the test results of three different structure forms of frame column,the specimens with tension bar have higher bearing capacity and larger stiffness. The tension bar can wall limit the relative drift between concrete and steel,which improves the bearing capacity of concrete. Setting tension bar in frame columns,the concrete is subjected to larger limitation to obtain better binding power between concrete and steel plate.The yield displacement is increased,and the ultimate displacement of frame column is decreased with reduced ductility.