A simple numerical modelling technique is prposed for estimating the shear-lag effects of tube(s)-in-tube structures. The proposed method idealises the framed-tube structures with multiple internal tubes as equvivalent multiple tubes (i.e.box beams), each composed of four equivalent orthotropic plate panels. hence, the tube(s)-in-tube system can be analysed using an analyogy approach where each tube is individually modelled by a boxy beam that can account for the flexural and shear deformations as well as the shear-lag effects. The numerical analysis of shear-lag is based on the minimum potential energy principle in conjunction with the variational approach. In the paper, additional bending stresses and the shear-lag reversal points are also investigated to estimate the shear-lag behaviour of such a system.
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