Numerical and analytical investigation of collapse loads of laced built-up columns

Kalochairetis, KE; Gantes, CJ

dc.contributor.author	Kalochairetis, KE	en
dc.contributor.author	Gantes, CJ	en
dc.date.accessioned	2014-03-01T01:36:31Z
dc.date.available	2014-03-01T01:36:31Z
dc.date.issued	2011	en
dc.identifier.issn	0045-7949	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21318
dc.subject	Collapse load	en
dc.subject	Global buckling	en
dc.subject	Laced built-up columns	en
dc.subject	Local buckling	en
dc.subject	Mode interaction	en
dc.subject	Nonlinear finite element analysis	en
dc.subject.classification	Computer Science, Interdisciplinary Applications	en
dc.subject.classification	Engineering, Civil	en
dc.subject.other	Collapse loads	en
dc.subject.other	Global buckling	en
dc.subject.other	Laced built-up columns	en
dc.subject.other	Local buckling	en
dc.subject.other	Mode interaction	en
dc.subject.other	Non-linear finite-element analysis	en
dc.subject.other	Buckling	en
dc.subject.other	Nonlinear analysis	en
dc.subject.other	Structural members	en
dc.subject.other	Yield stress	en
dc.subject.other	Finite element method	en
dc.title	Numerical and analytical investigation of collapse loads of laced built-up columns	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.compstruc.2010.10.018	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.compstruc.2010.10.018	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Built-up columns are often used in steel buildings and bridges providing economical solutions in cases of large spans and/or heavy loads. Two main effects should be taken into account in their design that differentiate them from other structural members. One is the significant influence of shear deformations due to their reduced shear rigidity. The second is the interaction between global and local buckling. These effects are addressed here from both a numerical and an analytical point of view for laced built-up columns. It is concluded that the largest loss of capacity occurs when the local and global Euler critical stresses and the yield stress all coincide. This reduction in capacity becomes more prominent in the presence of imperfections, reaching magnitudes in the order of 50%. Despite the detrimental effects of mode interaction many major design codes do not provide sufficient pertinent guidance. In order to address this issue, a simple analytical method is proposed for calculating the collapse load of laced built-up members taking into account the above effects as well as global imperfections, local out-of straightness and plasticity, which is then verified by means of nonlinear finite element analysis, using either beam or shell elements. The proposed method is found to provide improved accuracy in comparison to EC3 specifications in cases of global elastic failure. (C) 2010 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Computers and Structures	en
dc.identifier.doi	10.1016/j.compstruc.2010.10.018	en
dc.identifier.isi	ISI:000292418000032	en
dc.identifier.volume	89	en
dc.identifier.issue	11-12	en
dc.identifier.spage	1166	en
dc.identifier.epage	1176	en