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The paper addresses experimental tests, numerical simulations and DSM\u2010based design approaches that are intended to i) acquire in\u2010depth knowledge on the non\u2010linear behaviour (elastic and elastic\u2010plastic), load\u2010carrying capacity and failure mode nature of the members under consideration, and ii) make use of that knowledge to develop, propose and assess the merit of efficient DSM\u2010based design approaches to estimate their failure loads\/moments. Initially, illustrative column results are briefly presented to help grasp some fundamental concepts, namely the characterisation of i) the aforementioned mode coupling phenomena, ii) different sources of mode interaction that may lead to failure load\/moment erosion, and iii) the most detrimental initial geometrical imperfections. The DSM design curves currently codified and two strength curves recently developed for column flexural\u2010torsional and beam distortional failures are presented next. The two\u2010part paper then addresses separately each mode coupling phenomenon dealt with, for columns, but only L\u2010D and D\u2010G interaction for beams \u2013 while L\u2010D interaction (in columns and beams) appears in Part 1, the remaining column and beam coupling phenomena (all involving global buckling) are dealt with in Part 2 [1]. For columns undergoing L\u2010D and L\u2010D\u2010G interaction, beams experiencing L\u2010D interaction and angle columns susceptible to FT\u2010F interaction, the work reported includes experimental studies, numerical simulations and DSM\u2010based design considerations and\/or guidelines. For the remaining coupling phenomena, only numerical results are reported, but they unveil interesting (and unexpected) behavioural features that will help plan future test campaigns and achieve efficient design approaches. Finally, the two\u2010part paper closes with a few concluding remarks and an outlook regarding future developments in this field.<\/jats:p>","DOI":"10.1002\/stco.202000036","type":"journal-article","created":{"date-parts":[[2020,9,4]],"date-time":"2020-09-04T08:20:30Z","timestamp":1599207630000},"page":"165-185","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Mode interaction in cold\u2010formed steel members: state\u2010of\u2010art report"],"prefix":"10.1002","volume":"13","author":[{"given":"Dinar","family":"Camotim","sequence":"first","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. Rovisco Pais 1 1049\u2010001 Lisboa Portugal"}]},{"given":"Andr\u00e9 Dias","family":"Martins","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. Rovisco Pais 1 1049\u2010001 Lisboa Portugal"}]},{"given":"Pedro Borges","family":"Dinis","sequence":"additional","affiliation":[{"name":"CERIS, Instituto Superior T\u00e9cnico Universidade de Lisboa  Av. Rovisco Pais 1 1049\u2010001 Lisboa Portugal"}]},{"given":"Ben","family":"Young","sequence":"additional","affiliation":[{"name":"Department of Civil &amp; Environmental Engineering The Hong Kong Polytechnic University  Hong Kong China"}]},{"given":"Man\u2010Tai","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Ocean Engineering and Shanghai Key Laboratory for Digital Maintenance of Buildings &amp; Infrastructure, Department of Civil Engineering Shanghai Jiao Tong University  Shanghai 200240 China"}]},{"given":"Alexandre","family":"Landesmann","sequence":"additional","affiliation":[{"name":"PEC\/COPPE \u2013 Instituto Alberto Luiz Coimbra Universidade Federal do Rio de Janeiro  Rua Hor\u00e1cio Macedo, Bloco i, sl 216 (Centro de Tecnologia) 21941\u2010450 Rio de Janeiro Brazil"}]}],"member":"311","published-online":{"date-parts":[[2020,8,17]]},"reference":[{"issue":"3","key":"e_1_2_1_2_1","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1002\/stco.202000044","article-title":"Mode interaction in cold\u2010formed steel members: state\u2010of\u2010art report \u2013 Part 2: Couplings involving global buckling","volume":"13","author":"Camotim D.","year":"2020","journal-title":"Steel Construction"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1061\/(ASCE)0733-9445(2006)132:4(529)"},{"key":"e_1_2_1_4_1","unstructured":"AISI (American Iron and Steel Institute)(2016)North American Specification (NAS) for the Design of Cold\u2010Formed Steel Structural Members AISI\u2010S100\u201016 Washington DC."},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tws.2017.07.011"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tws.2017.12.002"},{"key":"e_1_2_1_7_1","doi-asserted-by":"crossref","unstructured":"Simulia Inc.(2008)Abaqus Standard (version 6.7\u20105).","DOI":"10.1016\/S1364-5439(08)70137-0"},{"issue":"6","key":"e_1_2_1_8_1","doi-asserted-by":"crossref","DOI":"10.1061\/(ASCE)EM.1943-7889.0001457","article-title":"Enhanced geometrically non\u2010linear Generalized Beam Theory (GBT) formulation: derivation, numerical implementation and illustration","volume":"144","author":"Martins A. 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