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Precast Bridge Deck for Railway Using HPFRC and UHPFRC
High (HPFRC) and ultra-high performance (UHPFRC) fibre reinforced cementitious composites open a new range of possibilities for innovative structural concepts. In this study the enhanced mechanical properties provided by HPFRC and UHPFRC are exploited in the development of a new precast railway bridge deck system.
A continuous deck composed by eight HPFRC precast T-shape girders with a cast-in-place slab is designed for spans up to 35 m. A thin and variable web thickness is adopted. Conventional concrete is used for the slab with exception of the connection zone where the continuity in the hogging moment region is materialized by UHPFRC and rebars. This yielded a reasonable solution in terms of reinforcement ratio and effectively solves problems related to crack widths without requiring post-tensioning continuity tendons.
The T-shaped longitudinal girders in HPFRC allow the construction of lighter elements, which is particularly advantageous for precast solutions where transportation and placement costs are significant and can thus be reduced. Moreover, the rational use of these materials is expected to reduce drastically the demand for passive reinforcement. Economic benefits from reduction of construction complexity, time, and labour help achieving a competitive solution.
Different modelling strategies are used to simulate the global structural behaviour to different actions. One model is used for simulating staged construction and time-dependent effects. Other model is used for assessment of the effects of rail traffic loads, including dynamic analysis using high-speed load models. A tool was developed for the flexural design of hybrid sections using fibre reinforced cementitious composites. Structural limit states relevant for railway bridges are checked as well as track safety and passenger comfort.
Precast Bridge Deck for Railway Using HPFRC and UHPFRC
High (HPFRC) and ultra-high performance (UHPFRC) fibre reinforced cementitious composites open a new range of possibilities for innovative structural concepts. In this study the enhanced mechanical properties provided by HPFRC and UHPFRC are exploited in the development of a new precast railway bridge deck system.
A continuous deck composed by eight HPFRC precast T-shape girders with a cast-in-place slab is designed for spans up to 35 m. A thin and variable web thickness is adopted. Conventional concrete is used for the slab with exception of the connection zone where the continuity in the hogging moment region is materialized by UHPFRC and rebars. This yielded a reasonable solution in terms of reinforcement ratio and effectively solves problems related to crack widths without requiring post-tensioning continuity tendons.
The T-shaped longitudinal girders in HPFRC allow the construction of lighter elements, which is particularly advantageous for precast solutions where transportation and placement costs are significant and can thus be reduced. Moreover, the rational use of these materials is expected to reduce drastically the demand for passive reinforcement. Economic benefits from reduction of construction complexity, time, and labour help achieving a competitive solution.
Different modelling strategies are used to simulate the global structural behaviour to different actions. One model is used for simulating staged construction and time-dependent effects. Other model is used for assessment of the effects of rail traffic loads, including dynamic analysis using high-speed load models. A tool was developed for the flexural design of hybrid sections using fibre reinforced cementitious composites. Structural limit states relevant for railway bridges are checked as well as track safety and passenger comfort.
Precast Bridge Deck for Railway Using HPFRC and UHPFRC
Lecture Notes in Civil Engineering
Ilki, Alper (editor) / Çavunt, Derya (editor) / Çavunt, Yavuz Selim (editor) / Valente, Rui (author) / Pimentel, Mário (author) / Sousa, Carlos (author) / Pinto, José Rui (author)
International Symposium of the International Federation for Structural Concrete ; 2023 ; Istanbul, Türkiye
2023-06-03
11 pages
Article/Chapter (Book)
Electronic Resource
English
Fibre reinforced concrete , High Performance Concrete , High Speed Railway bridges , Precast concrete , Prestressed concrete , Railway bridge , Structural design Engineering , Building Materials , Building Construction and Design , Structural Materials , Geotechnical Engineering & Applied Earth Sciences
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