Prestressing as action or resistance: Difference between revisions
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There are two distinct approaches to the design checks of prestressed concrete members - the prestressing can be either treated as resistance (integral part of the section) or as action (load) | There are two distinct approaches to the design checks of prestressed concrete members - the prestressing can be either treated as resistance (integral part of the section) or as action (load) | ||
== Prestressing as resistance == | |||
* Considers the prestressing strands as integral part of the cross section, where prestressing operation introduces imposed deformation corresponding the pre-elongation of the active reinforcement. | |||
== Prestressing as action == | |||
* Considers prestressing as external loading consisting of a self-equilibrating system of forces in the anchorages and the transversally in the concrete. After transfer prestressing strands are considered as conventional reinforcement, only taking into consideration the pre-elongation. | |||
== Treatment in different codes == | == Treatment in different codes == | ||
Revision as of 06:43, 14 April 2009
There are two distinct approaches to the design checks of prestressed concrete members - the prestressing can be either treated as resistance (integral part of the section) or as action (load)
Prestressing as resistance
- Considers the prestressing strands as integral part of the cross section, where prestressing operation introduces imposed deformation corresponding the pre-elongation of the active reinforcement.
Prestressing as action
- Considers prestressing as external loading consisting of a self-equilibrating system of forces in the anchorages and the transversally in the concrete. After transfer prestressing strands are considered as conventional reinforcement, only taking into consideration the pre-elongation.
Treatment in different codes
AASHTO LRFD 2007
- Based on C5.7.1, prestressing is treated as part of resistance
Eurocode 2 (1992)
- Based on article 5.10.1, bullet 2, the effects of prestressing can be considered as an action or a resistance
| Home > Topics > Prestressed Concrete e | |
| Overview | Overview · Hyperstatic forces |
| Prestress losses | Friction losses · Anchorage set losses |
| Miscellaneous | Tendon · Post-Tensioning · Partial prestressing · Restraint moment · Prestressing as action or resistance · Standard prestressed girders · Magnel diagram |
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| Related Topics | Reinforced Concrete |