| name = Tendons - frame moments and section cuts

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| description = This test problem clarifies how frame and tendon forces obtained from models with tendons should be interpreted. Both regular models and bridge modeler models are covered.

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| keyword = tendon; bridge; bridge modeler; section cut

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| program = SAP2000

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| version = V12.0.2

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| status = finalize

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| id = ok/tendons - frame moments and section cut forces}}

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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

 Screehshots

!Frame_moment_diagrams_for_bridge_models_with_tendons.png!

h1. Attachments

* [SAP2000 V12.0.2 model

|^SAP2000 V12.0.2

 model.zip] (Zipped SDB file)