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Inelastic Strength Behavior of Horizontally Curved Composite I-Girder Bridge Structural Systems: Fixed-End Bridge FEA Study
A representative horizontally curved composite I-girder bridge system was designed near the limits of the 2007 AASHTO bridge design specifications and tested at the Federal Highway Administration (FHWA) laboratories for its ultimate loading capacity. A synthesis of the experimental and full nonlinear FEA responses of the test bridge indicates that the component and system behavior was predominantly linear up to the AASHTO Mp-based 1/3 rule load level on the critical outside girder. Similar observations were also made for other parametric simply-supported bridges. These results indicate that simply-supported horizontally-curved composite I-girder bridges may be designed elastically using the AASHTO equation Mu + Sxfl /3 ≤ φfMn, where φfMn can be as large as φfMp. This is a substantial gain in strength for curved I-girder bridges relative to the current curved bridge provisions, which limit φfMn to a maximum of φfMy. Since the test bridge was simply-supported, a logical and natural extension is the consideration of continuous-span bridges. A convenient and simple way of achieving this extension is to use the base test bridge configuration but to assume that the girder ends are fully restrained. This paper presents a synthesis of the full nonlinear FEA results for this hypothetical fixed-end case.
Inelastic Strength Behavior of Horizontally Curved Composite I-Girder Bridge Structural Systems: Fixed-End Bridge FEA Study
A representative horizontally curved composite I-girder bridge system was designed near the limits of the 2007 AASHTO bridge design specifications and tested at the Federal Highway Administration (FHWA) laboratories for its ultimate loading capacity. A synthesis of the experimental and full nonlinear FEA responses of the test bridge indicates that the component and system behavior was predominantly linear up to the AASHTO Mp-based 1/3 rule load level on the critical outside girder. Similar observations were also made for other parametric simply-supported bridges. These results indicate that simply-supported horizontally-curved composite I-girder bridges may be designed elastically using the AASHTO equation Mu + Sxfl /3 ≤ φfMn, where φfMn can be as large as φfMp. This is a substantial gain in strength for curved I-girder bridges relative to the current curved bridge provisions, which limit φfMn to a maximum of φfMy. Since the test bridge was simply-supported, a logical and natural extension is the consideration of continuous-span bridges. A convenient and simple way of achieving this extension is to use the base test bridge configuration but to assume that the girder ends are fully restrained. This paper presents a synthesis of the full nonlinear FEA results for this hypothetical fixed-end case.
Inelastic Strength Behavior of Horizontally Curved Composite I-Girder Bridge Structural Systems: Fixed-End Bridge FEA Study
Jung, Se-Kwon (author) / White, Donald W. (author)
International Conference on Composite Construction in Steel and Concrete 2008 ; 2008 ; Devil's Thumb Ranch, Tabernash, Colorado, United States
2011-02-25
Conference paper
Electronic Resource
English
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