型钢高强混凝土组合柱偏心受压性能试验研究

Study on mechanical properties of steel reinforced high strength concrete columns under eccentric compression

通过型钢高强混凝土组合柱偏心受压试验与6根组合柱的有限元模拟,分析大小偏心受压柱破坏形态的不同以及型钢强度对型钢高强混凝土柱力学性能的影响。研究发现,不同偏心距的型钢高强混凝土柱破坏形态差别明显,小偏压试件破坏前无明显预兆;考虑混凝土约束效应的有限元模型可较好的模拟组合柱的受力发展过程;型钢强度的增大对组合柱承载力影响不明显,对延性提高较大。

Through the eccentric compression test of steel reinforced high strength concrete composite columns and the finite element simulation of six composite columns,this paper analyzes the different failure modes of large and small eccentric compression columns and the influence of steel strength on the mechanical properties of steel reinforced high strength concrete columns.It is found that the failure modes of steel reinforced high-strength concrete columns with different eccentricities are obviously different,and there is no obvious omen before the failure of small eccentric compression specimens,the finite element model considering the concrete restraint effect can better simulate the stress development process of composite columns,the increase of steel strength has no obvious effect on the bearing capacity of composite columns,but has a greater improvement on ductility.