Characterising the effect of global and local geometric imperfections on the numerical performance of a brace member
Hassan, M S Goggins, Jamie Salawdeh, S
Hassan, M S
Goggins, Jamie
Salawdeh, S
Publication Date
2015-07-09
Keywords
Type
Article
Downloads
Citation
Hassan, M S; Goggins, J; Salawdeh, S (2015). Characterising the effect of global and local geometric imperfections on the numerical performance of a brace member. Journal of Physics: Conference Series 628 ,
Abstract
A numerical imperfection study is carried out on a hot rolled tubular brace member under displacement controlled amplitudes. An appropriate range of global and local imperfections is used in the finite element analyses to evaluate the initial-post buckling compressive strength, lateral storey drift, energy dissipation and mid-length lateral deformation of the brace member. The purpose of this study is to assess the impact of the geometrical imperfection on the numerical performance, and to determine an amplitude range that can be used unequivocally for numerical modelling of brace members. It is shown that the amplitude of global imperfections has an effect on the initial response, whereas the amplitude of local imperfections has influence on the resistance capacity of the brace member at higher ductility level. Based on the results, a refined range of amplitude of global and local imperfections is proposed. This range is found to have a good agreement with design standards. In addition, an already established equation to find lateral deformation is compared to results from the analyses and found that the equation with some modification can be used accurately in design. In this paper, a modification factor is proposed in the equation to find the lateral deformation to account for the imperfection amplitude in the numerical analyses of brace members.
Funder
Publisher
IOP Publishing
Publisher DOI
Rights
Attribution-NonCommercial-NoDerivs 3.0 Ireland