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Flexural Design of Double Composite Box Girder over Interior Pier by LRFD Method  

Cho, Eun Young (명지대학교 토목환경공학과)
Shin, Dong Ku (명지대학교 토목환경공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.19, no.6, 2007 , pp. 737-749 More about this Journal
Abstract
Flexural design of double composite box girder over the interior pier for three-span continuous bridge was performed by the LRFD method. The maximum span length of the continuous bridge ranged from 80m to 120m and the relative ratio of the span length was assumed to be 1:1.25:1. The girder section was designed for the strength limit state and service limit state with additional design check for constructibility. Before the bottom concrete and compression flange showed a complete composite action, the buckling of lower compression flange was checked. The flexural stiffness and flexural resistance characteristics for the section and for the constituent members such as tension flange, compression flange, and web were analyzed for different thicknesses of the bottom concrete on top of the compression flange. The effect of the distribution ratio of steel between the top and bottom flanges was investigated by analyzing ductility behavior and stress distribution through the girder's depth for several different relative area ratios of steel between the top and bottom flanges. It was found that a total amount of 15% of steel can be saved by applying the double composite system compared with that of the conventional composite system.
Keywords
double composite bridge; box girder; negative-flexure section; LRFD design;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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