轴心受压钢骨-钢管高强混凝土组合柱承载力的研究

提出了一种重载柱设计的新模式,即钢骨-钢管混凝土组合柱。该组合柱是在钢管混凝土内埋设钢骨。通过13根具有不同套箍指标、配骨指标和长细比的组合柱的轴心受压试验,研究了其受力性能。研究结果表明,由于钢管、钢骨和混凝土的协同工作,可有效地提高柱子的承载力,延缓或抑制混凝土中剪切斜裂缝的开展,提高柱子的延性。组合柱的承载力和延性将随着长细比的增大而下降。基于试验研究结果,建立了轴压组合柱承载力数值计算模型,数值计算结果与试验结果吻合良好。

THE LOAD-BEARING CAPACITY OF AXIALLY LOADED CIRCULAR STEEL TUBULAR COLUMNS FILLED WITH STEEL-REINFORCED HIGH-STRENGTH CONCRETE

A new design model for column subjected to heavy loads is presented in this paper. This kind of column is formed by inserting steel section into concrete-filled steel tube, and is called circular steel tubular column filled with steel-reinforced concrete. A total of 13 axially loaded composite columns with various combinations of confinement index, structural steel index and slenderness ratio were tested. The mechanical behavior of the composite column is studied. Results show that the load-bearing capacity and ductility of the composite column are improved, and the propagation of cracks in concrete is mitigated or arrested effectively as concrete and steel work together. With the increase of slenderness ratio, the load-bearing capacity and ductility of the composite column decrease. Based on the test results, a numerical model for predicting the load-bearing capacity of the composite columns under axial load is developed. The calculated results are in good agreement with the test data.