precast prestressed I-girder negative moment capacity

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precast prestressed I-girder negative moment capacity

I modeled 2 continuous span bridge with prestressed concrete I-girders, and want to know both positive and negative moment capacities of the girder. From the report I only saw the positive moment capacity, but no negative moment capacity reported. I'm wondering if I did something wrong with the model or there is another way to report the negative moment capacity. Thanks!

Rick Brice
The negative moment capacity

The negative moment capacity will report automatically if everything is correct in the model.

My guess is that you have the analysis mode set to Simple Span. In this mode, continuity is never considered and hence there is no need to report negative moment capacity.

Set the analysis mode to Continuous or Envelope and verify the boundary conditions in your model are one of the continuous or integral options.

If this doesn't resolve the issue, please post your file and someone can take a look at it.

Richard Brice, PE
Software Applications Engineer
WSDOT Bridge and Structures Office

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