Civil Engineering Association

Precast concrete bridges: state-of-art report

Title Precast concrete bridges: state-of-art report
Volume 29 of Bulletin (Fédération internationale du béton)
Volume 29 of Bulletin // International Federation for Structural Concrete
Volume 29 of State-of-art report
Volume 29 of FIB Bulletin
Volume 29 of Bulletin - FIB
Authors Fédération internationale du béton, Fédération internationale du béton. Task Group 6.4
Publisher FIB - Féd. Int. du Béton, 2004
ISBN 288394069X, 9782883940697
Length 81 pages

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FIB 29: Precast concrete bridges

Prefabrication presents many advantages over traditional construction for bridges. They have resulted from the industrial approach and favourable working environment, protected from adverse weather conditions. For many years, the profession has been familiar with the principles and methods aiming at mastering the quality of the precast products. Each plant has a self-control system, defining the working procedures and modules for internal inspection and control. Among the many advantages, the following are of particular interest to bridge construction:

Quality and regularity of the concrete strength.
Elements with elaborated shapes designed to get a maximum benefit from the materials and the prefabrication. They require the use of relatively complex moulds, but at the same time enable high quality surfaces with respect to shape, texture, dimensional tolerances, etc., to be achieved.
Absence of laborious and hindering scaffolding.
Shorter construction time due to the fact that precast elements are made at the plant independent from the foundations and other preparatory works on site.
Precast bridges are not without criticism:
The perceived opinion from some instances, that precast bridges are monotonous and ugly.
The larger number of transversal joints in older realisations, especially in viaducts, causing discomfort and maintenance problems.
Certain specific technical issues, such as earlier doubts with regard to the transfer length of prestressing strands, particularly for large diameters subjected to fatigue stresses in railroad bridges. Another question concerned the effectiveness of the shear transfer at the interface between cast-in-situ concrete and prefabricated elements, especially in relation to fatigue stresses.
The aim of this State-of-the-Art report is to give a detailed overview of the existing solutions and applications world-wide and recent developments in the domain of precast bridges. They should enable the authorities and designers to form a realistic opinion about the possibilities and advantages of this technique, and get away from some still existing prejudices.

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FIB 29: Precast concrete bridges

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