| Title |
A Study on Compact Section Requirements for Plate Girder Web Panels with Longitudinal Stiffeners |
| Keywords |
steel plate girder;compact section;longitudinal stiffener;plastic moment;finite element method;강플레이트 거더;조밀단면;수평보강재;소성모멘트;유한요소법 |
| Abstract |
In AASHTO LRFD (2007), a compact section is defined as a section in which no premature failure caused by local buck-of web and flange plate or later buckling occurs before the section reaches the plastic moment, M<SUB>p</SUB>. 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. |