Steel and Composite Structures

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After-fracture behaviour of steel-concrete composite twin I-girder bridges: An experimental study

  • Lin, Weiwei (Department of Civil Engineering, Aalto University)
  • Received : 2020.10.13
  • Accepted : 2021.11.10
  • Published : 2022.01.10
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Abstract

To simplify the design and reduce the construction cost of traditional multi-girder structural systems, twin I-girder structures are widely used in many countries in recent years. Due to the concern on post-fracture redundancy, however, twin girder bridges are currently classified as fracture critical structures in AASHTO specifications for highway bridges. To investigate the after-fracture behavior of such structures, a composite steel and concrete twin girder specimen was built and an artificial fracture through the web and the bottom flange was created on one main girder. The static loading test was performed to investigate its mechanical performance after a severe fracture occurred on the main girder. Applied load and vertical displacement curves, and the applied load versus strain relationships at key sections were measured. To investigate the load distribution and transfer capacities between two steel girders, the normal strain development on crossbeams was also measured during the loading test. In addition, both shear and normal strains of studs were also measured in the loading test to explore the behavior of shear connectors in such bridges. The functions and structural performance of structural members and possible load transfer paths after main girder fractures in such bridges were also discussed. The test results indicate in this study that a typical twin I-girder can resist a general fracture on one of its two main girders. The presented results can provide references for post-fracture performance and optimization for the design of twin I-girder bridges and similar structures.

Keywords

Acknowledgement

This experimental work was sponsored by Waseda University Grant for Special Research Project-A (Grant Recipient: Weiwei Lin). The assistance provided by the Emeritus Professor Teruhiko Yoda from Waseda University in Japan, and Dr. Heang Lam from TTH Construction in Cambodia on the design of the test specimen and the experimental work, etc., are also gratefully acknowledged.

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