为探究焊接栓钉型钢混凝土（SSRC）柱在压弯剪扭复合受力作用下的滞回性能及抗扭承载力计算方法，以型钢配钢率、纵筋配筋率、体积配箍率、栓钉间距和栓钉位置为变化参数，设计并完成了12根SSRC柱和1根对比柱的拟静力加载试验。观察了试件的破坏形态，获取了各试件的滞回曲线、骨架曲线、承载力、能量耗散、变形性能等抗震性能指标，分析了不同变化参数对上述指标的影响规律，提出了该类构件的抗扭承载力计算公式。结果表明：各变化参数对试件的破坏形态影响较小，所有试件呈现为明显的弯扭型破坏；试件的扭矩-扭转角滞回曲线存在明显的捏缩现象，表现为反“S”形，但弯矩-位移滞回曲线较为饱满，表现为梭形；型钢配钢率和体积配箍率对SSRC柱的抗扭及抗弯承载力影响较小；纵筋配筋率和栓钉间距对SSRC柱的抗扭承载力影响较大，最大提高幅度分别为12.29%、18.92%，但对SSRC柱的抗弯承载力影响较小；焊接栓钉能够显著增强型钢混凝土柱的延性及能量耗散能力；综合承载力、能量耗散、延性等抗震指标，建议栓钉采用X型焊接；最后，提出了SSRC柱抗扭承载力实用计算公式，计算结果与试验结果吻合良好。
Abstract
In order to explore the calculation method of torsional bearing capacity and hysteretic behavior of steel reinforced concrete columns with welded studs (SSRC) columns under the combined action of compression, bending, shear and torsion, the quasi-static loading tests of 12 SSRC columns and 1 control column were designed and completed with the parameters of steel ratio, longitudinal reinforcement ratio, volume stirrup ratio, stud spacing and stud position. The failure modes of the specimens were observed, and the seismic performance indexes such as hysteresis curve, skeleton curve, bearing capacity, energy dissipation and deformation performance of each specimen were obtained. The influence of different parameters on the above indexes was analyzed, and the calculation formula of torsional bearing capacity of this kind of members was proposed. The results show that the variation parameters have little effect on the failure mode of the specimens, and all the specimens show obvious bending and torsion failure. The torque-torsion angle hysteresis curve of the specimen has obvious pinching phenomenon, which is shown as an inverse 'S' shape, but the bending moment-displacement hysteresis curve is relatively full, which is shown as a spindle shape. The steel ratio and stirrup ratio have little effect on the torsional and flexural capacity of SSRC columns. The longitudinal reinforcement ratio and stud spacing have a great influence on the torsional bearing capacity of SSRC columns, and the maximum increase is 12.29% and 18.92% respectively, but the influence on the flexural bearing capacity of SSRC columns is not significant. Welded studs can significantly enhance the ductility and energy dissipation capacity of steel reinforced concrete columns. Considering the seismic indexes such as bearing capacity, energy dissipation and ductility, it is recommended to use X-type welding for studs. Finally, a practical formula for calculating the torsional bearing capacity of SSRC columns is proposed. The calculated results are in good agreement with the test results.
关键词
型钢混凝土柱 /
压-弯-剪-扭 /
焊接栓钉 /
抗震性能 /
抗扭承载力
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Key words
steel reinforced concrete column /
compression-bending-shear-torsion /
welded stud /
seismic performance /
torsion bearing capacity
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