高含钢率SRC柱轴压承载性能研究

通过对3根含钢率为24.3%的SRC柱的轴压试验,对高含钢率SRC柱构件的轴压承载性能进行了研究。分析了试件的荷载-位移关系曲线特征,揭示了高含钢率SRC柱以钢骨为主要受力部分,依次发生混凝土开裂和压溃、钢筋屈曲、钢骨弯曲失稳等破坏形态。利用有限元软件ABAQUS对试验过程进行了模拟。研究表明,高含钢率SRC柱具有钢构件的承载特性,钢骨塑性阶段的整体失稳导致极限后的承载力下降;工程设计可以采用塑性准则和叠加原理计算其极限承载力。

Study on loading capacity of high steel ratio SRC columns under axial compression

The loading capacity of axially compressed SRC columns with high steel ratio was studied through experiment to three pieces of specimens with 24.3 percentage core steel.The features of loading-deformation curves,the failure process from crack and collapse of concrete,buckling of rebar and break of hoops to the entire instability of the core steel were discussed.Mechanism of load bearing capacity of SRC section was also discussed.FEM software ABAQUS was adopted to establish a non-linear analysis model.The results show that the behavior of SRC column with high steel ratio is similar to pure steel members;the plastically flexural buckling leads to the ultimate strength of the column,and the loading capacity can be predicated quite well through plastic theory and superposition method.