Numerical Study on Required Stiffness of Longitudinal Stiffener in Plate Girders

Abstract

-A numerical study on required stiffness of the longitudinal stiffener in the webs stiffened with flat plate at one-side of the web was conducted. The longitudinal stiffeners are commonly placed around , i.e., 1/5 the web depth due to fabrication convenience although most plate girders for bridges are unsymmetric section. Considering asymmetry of section, aspect ratio of web and the rigidity ratio of longitudinal stiffener(), eigenvalue analysis were performed to evaluate the buckling strength for the webs with a stiffener located at ～. Based on the parametric analysis, the required stiffness of the longitudinal stiffener to satisfy the buckling strength specified in AASHTO LRFD specifications was presented. Keywords -Stiffened web, Buckling strength, Unsymmetric girder, Longitudinal stiffener, Required stiffness , Alinia와 Moosavi [3] , Maiorana, Issa-El-Khoury 등