Fu Guangyuan, Fu Gongyi, Li Siping, Yang Jian, Wang Feiliang
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel). 2020 Nov 30;13(23):5463. doi: 10.3390/ma13235463.
Previous studies have shown that components with an unequal-walled concrete-filled rectangular hollow section (CFRHS) can achieve a greater resistance under bending than those with equal-walled CFRHS. However, the study on the compressive behavior of the CFRHS column is limited. Therefore, this paper investigates the performance of compressed CFRHS columns with unequal flange thickness, based on experimental and numerical approaches. In the test, the effects of slenderness and eccentricity on the compressive capacity of the CFRHS columns with unequal shell thickness are discussed. Numerical models based on the finite element method are established, to evaluate the resistance and failure pattern of each specimen in the test. Parametric studies are carried out based on the validated model, to investigate the effect of eccentricity, wall thickness, and steel and concrete material properties on the load-bearing capacity of the compressed CFRHS column. In addition, the analytical expressions of the resistance of CFRHS columns with unequal wall thickness are derived, and the prediction values are validated through comparing with the test results. It is found that eccentric compressed columns with unequal-walled CFRHS have a similar load-bearing capacity and better ductility when compared with the equal-walled CFRHS.
以往的研究表明，采用不等壁厚矩形钢管混凝土柱（CFRHS）的构件在弯曲作用下比采用等壁厚CFRHS的构件具有更大的抗力。然而，关于CFRHS柱受压性能的研究有限。因此，本文基于试验和数值方法，研究了不等翼缘厚度的CFRHS柱的性能。在试验中，讨论了长细比和偏心距对不等壁厚CFRHS柱抗压承载力的影响。建立了基于有限元法的数值模型，以评估试验中各试件的抗力和破坏模式。基于验证后的模型进行参数研究，以研究偏心距、壁厚以及钢材和混凝土材料性能对受压CFRHS柱承载力的影响。此外，推导了不等壁厚CFRHS柱抗力的解析表达式，并通过与试验结果对比验证了预测值。研究发现，与等壁厚CFRHS相比，不等壁厚CFRHS的偏心受压柱具有相似的承载力和更好的延性。
