An Explicit Approach for Determining the Rational Length of Steel Portion in Steel–Concrete Hybrid Girder Bridges
Publication: Journal of Bridge Engineering
Volume 28, Issue 1
Abstract
The steel–concrete hybrid girder bridge structure is a combination of steel and concrete members in the direction of the bridge length. In long-span segmental concrete box girder bridges, the utilization of lightweight steel girders in the middle portion of the main span would greatly reduce the bridge self-weight while decreasing concrete creep and shrinkage effects. A critical parameter in the design of hybrid girder bridges is the rational length of the steel portion as a part of the main span (in other words, the rational location of the steel–concrete connection). Based on the concept of system equivalence, the steel–concrete hybrid system is equivalent to a full-concrete system with a reasonable span arrangement. The governing condition of the equivalence is that both systems have the same magnitude of self-weight hogging bending moments over the piers. Applying the system equivalence method, the rational length ratio of the steel portion to the main span (ξ) is explicitly solved, and its relationship with the length ratio of side span to main span (λ) is established. Finally, the proposed analytical approach is validated by five case studies, indicating that it is an effective and efficient method for the preliminary design of hybrid girder bridges.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 52178116), and the Natural Science Foundation of Jiangsu Province (Grant No. BK20220072).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 28 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Apr 15, 2022
Accepted: Sep 13, 2022
Published online: Oct 31, 2022
Published in print: Jan 1, 2023
Discussion open until: Mar 31, 2023
ASCE Technical Topics:
- Box girders
- Bridge design
- Bridge engineering
- Bridges
- Bridges (by material)
- Bridges (by type)
- Concrete bridges
- Design (by type)
- Engineering fundamentals
- Girder bridges
- Girders
- Hybrid methods
- Methodology (by type)
- Span bridges
- Steel bridges
- Steel structures
- Structural engineering
- Structural members
- Structural systems
- Structures (by type)
- Wood bridges
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