Composite action of hexagonal concrete-filled steel tubular stub columns under axial loading
Composite action of hexagonal concrete-filled steel tubular stub columns under axial loading
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轴载六角形钢管混凝土短柱的复合作用
DOI：
10.1016/j.tws.2016.07.005
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发表时间：
2016
影响因子：
6.4
通讯作者：
Zhi-wu Yu
中科院分区：
文献类型：
--
作者：
Fa-xing Ding;Zhe Li;Shanshan Cheng;Zhi-wu Yu
进行了4组钢管混凝土六边形短柱轴压试验，研究了混凝土强度和含钢率对钢管混凝土六边形短柱性能的影响。采用有限元模型对钢管混凝土柱进行了参数分析和复合作用研究，并与试验数据进行了对比。根据本文所获得的基本数据，确定了钢管在极限状态下的轴向应力-屈服强度比。将核心混凝土的应力等值线简化为无约束的无约束区和六角钢管均匀约束的约束区。最后，基于叠加原理，提出了六边形钢管混凝土短柱极限承载力的实用设计公式。所提出的方程和实验结果之间的一个很好的协议进行了观察，与预测的平均比率为1.08，测量的能力和0.05的标准偏差。
Four groups of axial compression tests on hexagonal CFT stub columns have been carried out aiming to investigate the effects of the concrete strength and steel ratio on the behaviour of hexagonal CFT stub columns. Studies on parametric analysis and composite action between core concrete and steel tube have been carried out using FE modelling which had been benchmarked using the test data. Based on the essential data obtained in this paper, the ratio of axial stress-yield strength of steel tube was determined at the ultimate state. The stress contour of core concrete was simplified to an unconfined area without constraint and a confined area with uniform constraint imposed by hexagonal steel tube. Eventually, a practical design equation of the ultimate bearing capacity of hexagonal CFT stub columns was proposed based on the superposition principle. An excellent agreement between the proposed equation and the experimental results was observed, with an average ratio of predicted to measured capacity of 1.08 and a standard deviation of 0.05.