Abstract
The article discusses the analyses of a numerical model of an extradosed bridge built as part of the project called “Construction of S7 expressway connecting Miłomłyn and Olsztynek, together with construction of Ostróda Bypass as a section of national road no. 16.” The constructed facility fits in with the global trends of construction of next generation concrete bridges with tensioned tendons. The bridge is the best in its class in Europe in terms of the length of its main span. It is also one of the first concrete bridges in Poland which have been built using cantilever technology in which the extradosed tendons were stressed during construction process. The article contains, in particular, the selected results of the analyses related to changes of forces and normal stresses in extradosed tendons depending on live loads to which the bridge was exposed during the service phases, while accounting for environmental and rheological as well as passage of time.
Highlights
IntroductionExtradosed bridges (ex-d for short) are among the latest trends in the development of the bridges made of posttensioned concrete (in the classical Mathivata approach [1]) that are characterized by innovative structural and technological solutions
Extradosed bridges are among the latest trends in the development of the bridges made of posttensioned concrete that are characterized by innovative structural and technological solutions
Depending on the rigidity of girders and cable stays in cable-stayed bridges or tendons/cables extradosed in extradosed bridges, a bridge can be designed with a factor of safety for ex-d tendons/cables ranging from 1.67 to 2,5
Summary
Extradosed bridges (ex-d for short) are among the latest trends in the development of the bridges made of posttensioned concrete (in the classical Mathivata approach [1]) that are characterized by innovative structural and technological solutions. Depending on the rigidity of girders and cable stays in cable-stayed bridges or tendons/cables extradosed in extradosed bridges, a bridge can be designed with a factor of safety for ex-d tendons/cables ranging from 1.67 (due to tensile stress in the tendons being restricted to range of 0.6 fpk) to 2,5 (restriction of tensile stress to 0.4 fpk). World have spans of up to 250 meters and bridges with spans reaching 280 meters are being designed and built. One of the latest, interesting structural solutions in the construction of bridges with prefabricated butterfly web which enables construction of extradosed bridges with spans of up to 500 meters and cable-stayed bridges with spans reaching 800 meters [3]. The MS-3B bridge located along the ring road around Ostróda [4] follows global trends in the construction of ex-d bridges
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