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Behavior of Negative Moment Region of Continuous Double Composite Railway Bridges  

Shim, Chang Su (중앙대학교 토목공학과)
Kim, Hyun Ho (중앙대학교 건설환경연구소)
Yun, Kwang Jung (중앙대학교 토목공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.18, no.3, 2006 , pp. 339-347 More about this Journal
Abstract
This study proposes a double-composite section to enhance the s serviceability of twin-girder railway bridges, especially in terms of the flexural stiffness of the composite section in negative-moment regions. This paper deals with experiments on continuous twin-girder bridge models with 5m-5m span length with the proposed double-composite action. From results of static tests on the bridge models, several design considerations were investigated including effective width, shear connection and ultimate strength of the double-composite concrete slab showed full shear connection, which verified the suggested empirical equation. From the flexural behavior of the double-composite section, the effective width of the bottom concrete slab can be evaluated as that of the concrete slab under compression. The ultimate flexural strength of the bridge models verified the validity of the rigid plastic analysis of the double-composite section. Design guidelines were suggested based on the test results.
Keywords
double composite section; continuous twin-girder bridge; shear connection; ultimate flexural strength; efective width;
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