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http://dx.doi.org/10.5762/KAIS.2019.20.11.520

Analysis of Buckling Causes and Establishment of Reinforcement Method for Support of Plate Girder Bridge  

Ok, Jae-Ho (Department of Civil Engineering, University of Seoul)
Yhim, Sung-Soon (Department of Civil Engineering, University of Seoul)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.11, 2019 , pp. 520-526 More about this Journal
Abstract
I-type girders are widely applied as very economical sections in plate girder bridges. There has been research on developing composite laminated panels, curved plates reinforced with closed-end ribs, and new forms of ribs and compression flanges for steel box girders. However, there is a limitation in analyzing the exact cause of local buckling caused by an I-type girder's webs. Therefore, an I-type girder's web was modeled using the finite element analysis program LUSAS 17.0 before and after reinforcement. We checked for the minimum thickness criteria presented in the Korea highway bridge design code, and the cause of buckling after performing a linear elastic buckling analysis of dead and live loads was analyzed. Before reinforcement, an eigenvalue (λ1) at the 1st mode was 0.7025, the critical buckling load was smaller than the applied load, and there is a buckling. After reinforcement, when applying vertical and horizontal stiffeners to the web part of the girder at support, a Nodal line was formed, the eigenvalue was 1.5272, and buckling stability was secured. To improve buckling trace of the girder at the support, an additional plate was applied to the web at the support to ensure visual and structural safety, but buckling occurs at center of web. The eigenvalue (λ1) was 3.5299, and this method is efficient for reinforcing the web of the support.
Keywords
I-Type; Plate Girder Bridge; Local Buckling; Vertical and Horizontal Stiffeners; Critical Buckling Load; Eigenvalue; Additional Plate;
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Times Cited By KSCI : 1  (Citation Analysis)
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