Imperial College London
Portrait Picture

ProfessorLeroyGardner

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Structural Engineering
 
 
 
//

Contact

 

+44 (0)20 7594 6058leroy.gardner

 
 
//

Location

 

435Skempton BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Quan:2022:10.1016/j.engstruct.2021.113481,
author = {Quan, C and Walport, F and Gardner, L},
doi = {10.1016/j.engstruct.2021.113481},
journal = {Engineering Structures},
pages = {1--24},
title = {Equivalent imperfections for the out-of-plane stability design of steel beams by second-order inelastic analysis},
url = {http://dx.doi.org/10.1016/j.engstruct.2021.113481},
volume = {251},
year = {2022}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In current structural design specifications, such as EN 1993-1-1 for steel and EN 1993-1-4 forstainless steel, the stability of members is typically assessed through the use of buckling curves,which consider the influence of initial geometric imperfections and residual stresses. Analternative, more direct, approach is to perform either an elastic or inelastic second-orderanalysis of the member or structure with imperfections. For modelling convenience, so-called‘equivalent’ imperfections are typically utilised, which consider the combined influence ofboth geometric imperfections and residual stresses. Equivalent imperfections for the design ofcolumns and beams by second-order elastic analysis, also referred to as geometrically nonlinearanalysis with imperfection (GNIA), are provided in the current design specifications. Forcolumns, equivalent imperfections for design by second-order inelastic analysis, also referredto as geometrically and materially nonlinear analysis with imperfections (GMNIA), wererecently developed, but for beams that are susceptible to lateral-torsional buckling (LTB), thereare currently no appropriate provisions. The aim of this study is therefore to develop equivalentimperfections for use in out-of-plane stability design of steel and stainless steel members byGMNIA. The proposals are calibrated against the results of benchmark finite element (FE)simulations performed on a large number of steel and stainless steel members with geometricimperfections and residual stresses subjected to major axis bending. Two proposals forequivalent imperfection amplitudes are developed: (1) e0,mod, for use with eigenmode-affine2imperfections and (2) e0,bow, for use with sinusoidal bow imperfections. The latter is appliedsolely in the lateral direction and as a summation of a half-sine wave and a full sine wave.Relative to the traditional Eurocode design calculations, employing the proposed LTBimperfections in GMNIA provides generally more accurate me
AU  - Quan,C
AU  - Walport,F
AU  - Gardner,L
DO  - 10.1016/j.engstruct.2021.113481
EP  - 24
PY  - 2022///
SN  - 0141-0296
SP  - 1
TI  - Equivalent imperfections for the out-of-plane stability design of steel beams by second-order inelastic analysis
T2  - Engineering Structures
UR  - http://dx.doi.org/10.1016/j.engstruct.2021.113481
UR  - https://www.sciencedirect.com/science/article/abs/pii/S0141029621015844?via%3Dihub
UR  - http://hdl.handle.net/10044/1/92759
VL  - 251
ER  -
Download