不同长细比圆钢管混凝土柱偏心试验研究

EXPERIMENT ANALYSIS OF DIFFERENT SLENDERNESS RATIOS OF CONCRETE FILLED STEEL TUBULAR COLUMN UNDER ECCENTRIC LOAD

  • 摘要: 针对不同长细比圆钢管混凝土短柱试件进行了试验研究, 介绍了试验参数、试验装置和方法, 得到载荷与应变、载荷与挠度的曲线, 分析了长细比对该类构件力学性能的影响规律, 并应用相关规程进行了极限承载力的验算, 针对该类构件在工程中的应用提出了合理的建议. 结果表明, 随着长细比的增大, 钢管对核心混凝土的约束作用不断减弱, 极限承载力也明显下降, 而其横向变形能力逐渐减弱, 在延性方面则影响不大. 试件达到极限承载力时对应受压区的纵环向应变也比较大.

     

    Abstract: Experiments were carried out on the short CFST columnsof different slendemess ratios. The test parameters, setups andmethods are described. The curves of load vs. strain and deflection aobtained. The influence of the load slendemess ratio on the behavior ofeccentrically-loaded CFST columns is analyzed. The ultimate bearingcapacity is checked against related codes. Some suggestions are made forthe application of the related structures in engineering. The results indicatthat with the increase of load slendemess ratio, the confinement of steel tube to coreconcrete, and the ultimate carrying capacity of the column are decreased and thehorizontal deformation is reduced, but with little effect on ductility.The longitudinal and toroidal strains in the compressive zone of theextreme compressive fiber at the ultimate load are increased.

     

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