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http://dx.doi.org/10.12652/Ksce.2010.30.6A.503

A Study on Compact Section Requirements for Plate Girder Web Panels with Longitudinal Stiffeners  

Lee, Myung Soo (인천대학교 도시환경공학부)
Lee, Doo Sung ((주)홍지디씨에스)
Lee, Sung Chul (동국대학교 토목환경공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.30, no.6A, 2010 , pp. 503-512 More about this Journal
Abstract
In AASHTO LRFD (2007), a compact section is defined as a section in which no premature failure caused by local buckling of web and flange plate or later buckling occurs before the section reaches the plastic moment, Mp. The current AASHTO LRFD (2007) provides the compact section requirement by limiting the web slenderness only for webs without longitudinal stiffeners. The role of longitudinal stiffener is to increase the web buckling strength caused flexure. Although a web does not satisfy the compactness requirement without longitudinal stiffeners, the web buckling can be prevented by use of valid longitudinal stiffeners. Therefore, the web may be able to reach the plastic moment. However, the reason why a longitudinal stiffener may not be used to satisfy compactness requirement is not cleary explained in AASHTO LRFD (2007). In this study, the buckling and ultimate strength behaviors of stiffened webs subjected to bending are investigated through the linear buckling and nonlinear finite element analysis. It is found that steel plate girders having webs that do not satisfy the compactness requirement are able to reach the plastic moment if the longitudinal stiffeners have sufficient rigidities and are properly located. From a nonlinear regression analysis of the results, a new compactness requirement is suggested for webs stiffened with one longitudinal stiffener.
Keywords
steel plate girder; compact section; longitudinal stiffener; plastic moment; finite element method;
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