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h1. Overview

*Note: Some of the features described on this pages were implemented in V14 of the program.*

This attached model contains the following four separate structures (please see the screenshot below):

* 1 span bridge structure created using bridge modeler

* 1 span bridge structure created using manual modeling

* 2 span bridge structure created using bridge modeler

* 2 span bridge structure created using manual modeling


All four structures have the following properties:

* each span length is 10m

* deck section is a concrete deck section 0.5m deep and 3m wide

* the structures are simply supported at each abutment and bent

* Straight 25mm dia tendon is defined to run along the entire length of the structures. The tendon is located 0.05m from the bottom of the section and a prestressing force of 10kN with no losses was applied to the tendon.


Goals of this model:

* Determine and review moments and other internal forces resulting from prestressing.

* Verify prestressing forces used for flexural design check.

* Compare prestressing forces obtained from "Display > Show Bridge Forces/Stresses" form with forces obtained from frame elements.

* Define section cut cutting through tendon and frame, get forces and compare them with forces obtained from frame and tendon elements at the same location.


h1. Model Screenshots

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!Frame_moment_diagrams_for_bridge_models_with_tendons.png|align=center,border=0,width=800px!

!Frame_moment_diagrams_for_bridge_models_with_tendons.png|align=center,border=0!

{center-text}Figure 1 - Frame moment diagram, bridge model with tendons{center-text}


h1. See also

* [tp:Obtaining hyperstatic forces for bridge object superstructures]

h1. Attachments

* [SAP2000 V12.0.2 model|Tendons - frame moments and section cuts^SAP2000 V12.0.2 model.zip] (Zipped SDB file)