Restraint moment

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Precast prestressed concrete girders have a tendency to creep upwards over time due to the prestressing force and other effects. If a girder's ends are restrained by a pier or diaphragm, forces will build up in the girder due to the creep. Typically, the ultimate restraint moment in a girder is a positive moment. This moment combines with other moments in the girder, creating an increase in the mid-span positive moment and a decrease in the negative moment over the piers. In essence, the continuity of the girder is reduced, and the continuous forces move towards simple-span values.

External References

 

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

      Related Topics Reinforced Concrete
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