Numerical investigation on the performance of concrete-filled double-skin steel tubular members under tension
Numerical investigation on the performance of concrete-filled double-skin steel tubular members under tension
复制标题
DOI：
10.1016/j.tws.2014.02.001
复制
发表时间：
2014-06
影响因子：
6.4
通讯作者：
Wei Li;Lin-Hai Han;T. Chan
中科院分区：
文献类型：
--
作者：
Wei Li;Lin-Hai Han;T. Chan
本文对双层钢管混凝土（CFDST）构件的抗拉性能进行了数值研究。建立了CFDST构件在同心和偏心拉力作用下的综合有限元模型，并根据试验结果进行了校核。对比结果表明，所提出的有限元模型能够较好地反映受拉试件的结构特性。然后进行了参数化研究，研究了一些关键参数，如材料强度、标称钢比和空心比对复合材料构件拉伸性能的影响。讨论了钢-混凝土复合作用、加载路径的影响以及拉弯相互作用隔膜。研究发现，构件的抗拉强度取决于钢管与夹层混凝土的复合作用，张弯相互作用膜片可以用简单的线性关系表示。最后，提出了预测CFDST构件抗拉强度的设计方程，对比结果表明该方程具有较好的精度。
This paper presents a numerical investigation on the tensile behaviour of concrete-filled double-skin steel tubular (CFDST) member. A comprehensive finite element (FE) model is established and calibrated against the test results for the CFDST members under concentric and eccentric tension. The comparison shows that the proposed FE model is capable to capture the structural behaviour of the tensile specimens. Parametric studies are then conducted to investigate the influence of some key parameters, such as the material strength, the nominal steel ratio and the hollow ratio on the tensile behaviour of composite members. The steel–concrete composite action, the effect of loading paths and the tension–bending interaction diaphragm are also discussed. It is found that the tensile strength of the member depends on the composite action between steel tubes and sandwich concrete, and the tension–bending interaction diaphragm can be represented by a simple linear relationship. Finally, the design equation to predict the tensile strength of CFDST member is proposed, and the comparison results show that the proposed equation has a good accuracy.