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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Application of External Prestressing of Bridges in Germany
Author(s): Holger S. Svensson
Publication: Special Publication
Appears on pages(s): 125-144
Keywords: bridges (structures); concrete construction; corrosion; economics; grouting; history; limit design method; post-tensioning; prestressed concrete; prestressing; strains; structural design; unbonded prestressing; Design
Abstract:The main advantage of external prestressing is that it facilitates the placement and vibration of the web concrete and thus permits thinner webs. The main disadvantages of unbonded external prestressing are its reduced ultimate capacity and lack of contribution to crack control. The cost of bridges built with unbonded external tendons in Germany is currently higher than for those with bonded internal tendons, mainly because of code requirements for minimum web thickness and crack control, and higher costs for the external unbonded tendons. External prestressing has only limited application in Germany. For new concrete bridges, it has been used a few times since the 1950s for tendons bonded to the webs. The first experimental new bridge with unbonded external tendons in Germany is currently under construction. Special applications of external tendons are for incrementally launched bridges, the rehabilitation of bridges, and as longitudinal force couplers. In the future, unbonded external tendons will probably be used mainly for the rehabilitation of existing bridges in Germany.
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