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为研究带拉杆约束矩形截面钢管混凝土短柱的抗震性能,以轴压比、约束拉杆间距和截面长宽比为主要参数,进行了4个无拉杆约束和11个带拉杆约束矩形钢管混凝土短柱试件的低周往复加载试验。研究了其破坏过程、滞回性能、承载能力、变形能力、刚度退化及耗能能力等,并基于数值分析给出了带约束拉杆矩形截面钢管混凝土短柱压弯承载力计算式。结果表明:钢管板件宽厚比为50和67、剪跨比为3的矩形截面钢管混凝土短柱的滞回曲线饱满,没有明显的捏缩;设置约束拉杆提高了试件的承载能力、变形能力及耗能能力;带约束拉杆试件的极限位移角在1/19~1/50之间,位移延性系数在3.28~6.25之间;破坏时的等效黏滞阻尼系数在0.3以上;增加轴压比降低了试件的延性;减小约束拉杆间距可明显改善柱的抗震性能;保持截面宽度不变,增加截面长宽比,可提高试件承载力,但延性降低。提出的带约束拉杆矩形截面钢管混凝土短柱的压弯承载简化计算式的计算结果与试验结果吻合较好。
Study of seismic performance with trolley rectangular tubular concrete short constraint to axial compression ratio, and binding bars sectional aspect ratio of the major pitch parameters, four tie bar 11 with the constraint and constraint rectangular CFT stub columns rod Low-cycle reciprocating loading test of the test piece. We study their destruction process, hysteretic performance, carrying capacity, deformation capacity, energy dissipation and stiffness degradation, and based on the numerical analysis gave the binding bars with rectangular tubular concrete short bending bearing capacity calculating equation. The results showed that: steel thickness ratios of 50 and 67, ratio of shear span concrete filled steel tubes of rectangular cross-section 3 of the hysteresis loop full, no significant pinch; providing increased carrying capacity constraints rod specimens, deformability And energy dissipation capacity; the limit displacement angle of the tie rod specimen with restraint is between 1/19 and 1/50; the displacement ductility coefficient is between 3.28 and 6.25; the equivalent viscous damping coefficient at failure is above 0.3; The pressure ratio reduces the ductility of the specimen; reducing the distance between the constrained rods can significantly improve the seismic performance of the column; maintaining the width of the cross-section and increasing the aspect ratio can increase the bearing capacity of the specimen, but the ductility decreases. The proposed simplified calculation formula for the compression-bent bearing of a concrete-filled rectangular column with a constrained tie bar is in good agreement with the experimental results.