01-27-2010, 03:07 PM
Design development of steel-concrete composite bridges in France
Jacques Brozzetti
Abstract
After a review of the market share of composite bridges in France as compared to other solutions the present paper gives information, for short and medium span length, on the cost efficiency of this type of solution compared to prestressed concrete bridge.
Then, the paper presents the recent technical trends in the design of composite bridges in France which, partly, explain the regain of competitiveness and the favour of the owners. Further considerations on the innovation concerning recent developments of composite bridges are also given. Particular attention is drawn on the execution practices and design rules limiting the cracking in concrete bridge decks particularly at the early age.
Flexural behavior of steel I-beam prestressed with externally unbonded tendons
Sunkyu Parka, Taewan Kim , Kwangsoo Kima and Sung-Nam Honga
Abstract
The external post-tensioning technique has been commonly used in the construction field because it facilitates the analysis of structures and is widely applicable for many types of structures. In this paper, the flexural behavior and strengthening effect of a bridge were studied using a steel I-beam that had been externally prestressed with unbonded tendons. Eleven steel beams were fabricated and tested in terms of the tendon type, the amount of tendon or prestressing force, the installation of a deviator, and the embedment of a draped tendon. The results show that the externally prestressing method creates a stiffer steel beam when the proper amount of prestressing force is applied and when detail techniques are appropriately combined.The experimental results were compared to a theoretical solution in order to verify whether the external post-tensioning method is useful for strengthening a steel bridge and whether it is applicable in the construction field.
Jacques Brozzetti
Abstract
After a review of the market share of composite bridges in France as compared to other solutions the present paper gives information, for short and medium span length, on the cost efficiency of this type of solution compared to prestressed concrete bridge.
Then, the paper presents the recent technical trends in the design of composite bridges in France which, partly, explain the regain of competitiveness and the favour of the owners. Further considerations on the innovation concerning recent developments of composite bridges are also given. Particular attention is drawn on the execution practices and design rules limiting the cracking in concrete bridge decks particularly at the early age.
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Flexural behavior of steel I-beam prestressed with externally unbonded tendons
Sunkyu Parka, Taewan Kim , Kwangsoo Kima and Sung-Nam Honga
Abstract
The external post-tensioning technique has been commonly used in the construction field because it facilitates the analysis of structures and is widely applicable for many types of structures. In this paper, the flexural behavior and strengthening effect of a bridge were studied using a steel I-beam that had been externally prestressed with unbonded tendons. Eleven steel beams were fabricated and tested in terms of the tendon type, the amount of tendon or prestressing force, the installation of a deviator, and the embedment of a draped tendon. The results show that the externally prestressing method creates a stiffer steel beam when the proper amount of prestressing force is applied and when detail techniques are appropriately combined.The experimental results were compared to a theoretical solution in order to verify whether the external post-tensioning method is useful for strengthening a steel bridge and whether it is applicable in the construction field.
Code:
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Content of this section is hidden, You must be registered and activate your account to see this content. See this link to read how you can remove this limitation:
http://forum.civilea.com/thread-27464.html
***************************************