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{live-template:Test Problem}

{{Test Problem
| name = Tendons - frame moments and section cuts |
| 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. |
| keyword = tendon; bridge; bridge modeler; section cut |
| program = SAP2000 |
| version = V12.0.2 |
| status = finalize |
| id = ok/tendons - frame moments and section cut forces}} |

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|^SAP2000Tendons - frame moments and section cuts^SAP2000 V12.0.2 model.zip] (Zipped SDB file)