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h1. Handling of hyperstatic moments

The flexural design check for prestressed-concrete box-girder bridge superstructures fully accounts for secondary effects from prestress-tendon forces. Primary prestress forces are removed and demands automatically include secondary forces. Hyperstatic load cases need not be included in design combinations. [Tendons|kb:Tendon] must be modeled as elements for the flexural design check. 

Users should create load combinations with prestress loading. Primary forces are calculated through subtraction of tendon force from demand. Additional [concrete|kb:Concrete] forces are either secondary or imposed. 

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* [t:Hyperstatic analysis]
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