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Design strength of locally buckling stub-lipped channel columns / M. V. Anil Kumar in Journal of structural engineering, Vol. 138 N° 11 (Novembre 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1291-1299 Titre : Design strength of locally buckling stub-lipped channel columns Type de document : texte imprimé Auteurs : M. V. Anil Kumar, Auteur ; V. Kalyanaraman, Auteur Année de publication : 2013 Article en page(s) : pp. 1291-1299 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cold-formed  steel  Lipped  channel  Stub  column  Local  buckling  Direct  strength  method Résumé : The compressive strength of cold-formed steel (CFS) lipped channel (LC) members may be governed by yielding, local, distortional, or overall buckling, and any possible interaction among these modes. The direct strength method (DSM) has been advanced recently for evaluating the strength of CFS LC beams and columns. Although the DSM is an improvement over other methods in terms of simplicity and accuracy, further improvement by minor modification to the DSM is possible if all the parameters that affect the strength of such members is properly accounted for and understood. In this study, the DSM equations for evaluating the strength of members that fail after experiencing only local buckling are discussed. The strength of such members, according to the DSM, is a function of only the ratio of yield strength of the section (Py) to the elastic local buckling load (Pcrℓ) (also equal to the reciprocal of square of the nondimensional local buckling slenderness ratio, 1/λ2ℓ). This study indicates that the relative area of the stocky elements of the cross section, which are less vulnerable to elastic local buckling, also influences the strength of such members. Using the experimental results available in the literature and the finite-element analysis data generated in this study, the behavior and strength of stub LC compression members experiencing only local buckling before failure by yielding are evaluated. Simple modifications to the currently available DSM equations are suggested to more accurately evaluate the strength of such members. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000575 [article] Design strength of locally buckling stub-lipped channel columns [texte imprimé] / M. V. Anil Kumar, Auteur ; V. Kalyanaraman, Auteur . - 2013 . - pp. 1291-1299. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1291-1299 Mots-clés : Cold-formed  steel  Lipped  channel  Stub  column  Local  buckling  Direct  strength  method Résumé : The compressive strength of cold-formed steel (CFS) lipped channel (LC) members may be governed by yielding, local, distortional, or overall buckling, and any possible interaction among these modes. The direct strength method (DSM) has been advanced recently for evaluating the strength of CFS LC beams and columns. Although the DSM is an improvement over other methods in terms of simplicity and accuracy, further improvement by minor modification to the DSM is possible if all the parameters that affect the strength of such members is properly accounted for and understood. In this study, the DSM equations for evaluating the strength of members that fail after experiencing only local buckling are discussed. The strength of such members, according to the DSM, is a function of only the ratio of yield strength of the section (Py) to the elastic local buckling load (Pcrℓ) (also equal to the reciprocal of square of the nondimensional local buckling slenderness ratio, 1/λ2ℓ). This study indicates that the relative area of the stocky elements of the cross section, which are less vulnerable to elastic local buckling, also influences the strength of such members. Using the experimental results available in the literature and the finite-element analysis data generated in this study, the behavior and strength of stub LC compression members experiencing only local buckling before failure by yielding are evaluated. Simple modifications to the currently available DSM equations are suggested to more accurately evaluate the strength of such members. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000575

Evaluation of direct strength method for CFS compression members without stiffeners / M. V. Anil Kumar in Journal of structural engineering, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 879-885 Titre : Evaluation of direct strength method for CFS compression members without stiffeners Type de document : texte imprimé Auteurs : M. V. Anil Kumar, Auteur ; V. Kalyanaraman, Auteur Année de publication : 2011 Article en page(s) : pp. 879-885 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cold-formed  steel  Direct  strength  method  Effective  width  method  Plain  channel  Rectangular  hollow  section  I-section Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The axial compressive strength of the cold-formed steel (CFS) members with edge or intermediate stiffener is affected by interaction of local, distortional and overall buckling. In order to overcome the tedious and time consuming nature of the traditional Effective Section method of evaluating strength of such members, direct strength method (DSM) has been advanced recently. However, the DSM has not been adequately evaluated for calculating the strength of compression members (such as tubular, plain channel, and I-sections) consisting of only stiffened and unstiffened elements, without either lip stiffener or intermediate stiffener. These members experience interaction of only local and overall buckling before failure. In this paper, results of a study on the suitability of DSM to evaluate the compressive strength of plain channel, I and rectangular tubular members is presented. Extensive experimental data in literature and additional data generated using currently accepted effective width method (based on better estimate of local buckling stress evaluated considering element interaction), are used in this study. It is found that DSM can be used to evaluate strength of such members also. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p879_s1?isAuthorized=no [article] Evaluation of direct strength method for CFS compression members without stiffeners [texte imprimé] / M. V. Anil Kumar, Auteur ; V. Kalyanaraman, Auteur . - 2011 . - pp. 879-885. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 879-885 Mots-clés : Cold-formed  steel  Direct  strength  method  Effective  width  method  Plain  channel  Rectangular  hollow  section  I-section Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The axial compressive strength of the cold-formed steel (CFS) members with edge or intermediate stiffener is affected by interaction of local, distortional and overall buckling. In order to overcome the tedious and time consuming nature of the traditional Effective Section method of evaluating strength of such members, direct strength method (DSM) has been advanced recently. However, the DSM has not been adequately evaluated for calculating the strength of compression members (such as tubular, plain channel, and I-sections) consisting of only stiffened and unstiffened elements, without either lip stiffener or intermediate stiffener. These members experience interaction of only local and overall buckling before failure. In this paper, results of a study on the suitability of DSM to evaluate the compressive strength of plain channel, I and rectangular tubular members is presented. Extensive experimental data in literature and additional data generated using currently accepted effective width method (based on better estimate of local buckling stress evaluated considering element interaction), are used in this study. It is found that DSM can be used to evaluate strength of such members also. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i7/p879_s1?isAuthorized=no