Restraint moments in precast prestressed concrete girder bridges - Engineering Society
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Sunday, October 21, 2018

Restraint moments in precast prestressed concrete girder bridges

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.

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