Comparison of Internal and External Prestressing for Typical Highway Bridges

• Presented at: IABSE, 16th Congress
• Published in: IABSE, 16th Congress
• Lucerne, Switzerland: IABSE, 16th Congress, 2000

The paper presents an analytical comparison of the amount of prestressing required for two similar bridges, one with internal and the other with external prestressing. This comparison shows that bridges with external prestressing can become economically competitive for large girder depths. The detrimental effect of the smaller stress in the prestressing steel at the ultimate limit state is more than compensated by the thinner webs made possible by the absence of the ducts.

Keywords: précontrainte sans adhérence ; perte de précont ; cisaillement ; flexural strength ; balancement ; durabilité ; prestressed concrete ; prestress level ; précontrainte extérieure ; acier ; beam and slab bridge ; shear strength ; comportement statique ; shear ; précontrainte injectée ; béton armé ; armature minimale ; allongement des câbles à la rupture ; câble ; résistance à l'effort tranchant ; steel ; résistance à la flexion ; structural safety ; cable ; fissuration ; optimization ; optimisation ; failure by elongation of cables ; ancrage ; bridge ; durability ; pont ; sécurité structurale ; external prestressing ; analytic model ; Eurocode ; Theory of structures ; prestress loss ; reinforced concrete ; modèle analytique ; pont poutre ; structural behaviour ; injected prestressing ; anchorage ; unbounded prestressing ; analyse des structures ; béton précontraint ; minimum reinforcement ; perte de précontrainte ; crack growth

Reference

• EPFL-CONF-111650

• URL: http://is-beton.epfl.ch//Publications/2000/Burdet00.pdf

Record created on 2007-09-12, modified on 2012-03-20