Design Guide Economic and Durable Design of Composite Bridges with Integral Abutments

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Design Guide Economic and Durable Design of Composite Bridges with Integral Abutments

Size: 8.55 MB | Format: PDF | Publisher: RWTH Aachen University | Year: 2010 | pages: 83

Bridges are of vital importance to the European infrastructure and composite bridges already became a popular solution in many countries and a well-established alternative to concrete bridges. Their competitiveness depends on several circumstances such as site conditions, local costs of material and staff and the contractor’s experience. One outstanding advantage of composite bridges compared to concrete bridges is that the steel girders can carry the weight of the formwork and the fresh concrete during casting. Another major advantage is the savings in construction time, which reduces the traffic disturbance, consequently saves money for the contractor but even more for the road users; a fact that for a long time has been neglected. Recently this factor is increasingly drawn into focus as latest studies show the necessity of taking not only the simple production costs but also the construction time and the maintenance costs into account when deciding for a specific bridge type. Thus nowadays the following demands are imposed on bridge structures, which are all met by the construction of composite bridges
• low production and maintenance costs
• short construction time, saving costs for traffic disturbances
• bridge construction without essential interference of the traffic under the bridge
• minimised traffic disturbance for maintenance
All these needs are met by integral abutment bridges as well. In addition, this bridge type holds the potential to outclass traditional bridges with transition joints as it does not only reduce production and maintenance costs but saves economic and socio-economic costs as well.
• The superstructure can be designed quite slender, which decreases the construction height and the earthworks respectively. This leads to a further decrease of material, fabrication, transport and construction costs.
• Frame bridges allow in certain spans for the elimination of the middle support. This simplifies the construction of the bridge without essential interference of the traffic under the bridge, as the road has not to be closed.
• Due to the absence of bearings and joints, the maintenance costs can be decreased significantly.
This design guide is addressed to designers, constructors, owners and authorities to help them during the whole process of decision making, planning, design and construction of integral abutment bridges.

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