Abstract
The road and railway infrastructure in Poland has been intensively developed and modernized for the last years. Around 300 new bridges are built annually. Among the new structures there is a group of modern extradosed bridges. This paper presents examples of short-, medium- and long-span extradosed bridges designed and built in recent years in Poland. The following structures are described in details: - the first Polish extradosed bridge; - two-span landmark viaduct over motorway; - multi-span curved motorway bridge; - the longest Polish extradosed bridge; - tramway extradosed bridge; - conceptual designs. The paper is concluded with geometrical parameters characterising presented structures. The parameters are compared with values obtained for cable stayed bridges and extradosed bridges built worldwide.
Highlights
The extradosed bridge is a relatively new type of structure that has been developed since the 1990s
The extradosed bridge can be defined as the structure being between the girder bridge and the cable-stayed bridge (Mermigas, 2008; Collings and Gonzalez, 2013)
Stays in the extradosed bridges can be stressed to a relatively high level, similar to used in prestressed girder structures, since the stress variation under live loads in stays is usually lower in comparison with the cable-stayed bridges (Kasuga, 2006; Mermigas, 2008)
Summary
The extradosed bridge is a relatively new type of structure that has been developed since the 1990s. The key feature visually distinguishing the extradosed bridge from the cable-stayed bridge is the low tower height above the deck and shallow stay angles. Another specific feature of the extradosed bridges is the larger girder stiffness in comparison to that of the cable-stayed bridges. Stays in the extradosed bridges can be stressed to a relatively high level, similar to used in prestressed girder structures, since the stress variation under live loads in stays is usually lower in comparison with the cable-stayed bridges (Kasuga, 2006; Mermigas, 2008). The deck has concrete crossbeams over the supports and steel plate crossbeams interacting with concrete elements of the section in the spans
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