反复荷载作用下方钢管混凝土柱的抗震性能试验研究

本文介绍了１２根承受常轴力和反复水平荷载作用的方钢管混凝土柱试件的试验，研究了不同试验参数，如宽厚比（ Ｒｆ）、轴压比（ ｎ＝ Ｎ／ Ｎ０）和内填混凝土强度（ｆｃｕ）对试件抗震性能的影响。试验结果表明，方钢管混凝土柱具有良好的荷载－位移滞回性能和抗局部屈曲的能力以及比普通钢筋混凝土柱更好的耗能能力和更小的强度退化。通过编写的计算程序，对方钢管混凝土柱的荷载－变形全过程进行了分析，计算得到的弯矩－轴力－曲率关系和荷载－位移关系与试验结果吻合较好。

Seismic Behavior of Concrete-filled Rectangular Steel Tubular Columns Under Cyclic Loading

An Investigation of the seismic behavior of twelve concrete-filled rectangular steel tubular (CFRT) column specimens subjected to reversed cyclic lateral load and constant axial load is reported. The effects of varying width-thickness ratio of the plate (Rf), axial compression force ratio (n = N/ NO), and strength of concrete cores (fc) have been studied. The results show that the CFRT column has good load-displacement hysteretic behavior and behavior of resisting local bucking. In comparison with the conventional reinforced concrete columns, the CFRT columns exhibit greater energy-dissipation characteristics and smaller strength degradation. The load-displacement relationship of CFRT is analyzed by numerical computation while the moment-axial force-curvature relationship and load-displacement relationship obtained by the proposed numerical method are in good agreement with the experimental ones.