{{Test Problem

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):

...

On this page:

Overview

The model attached contains four separate structures, shown below in Figures 1 and 2, and listed as follows:

• Two-span bridge created using the bridge modeler

• Two-span bridge created manually

• One-span bridge created using the bridge modeler

• One-span bridge created manually

All four structures have the following properties:

• each

  Each span length is 10m.

• deck section is a concrete deck section

  Concrete deck sections are 0.5m deep and 3m wide

  the structures are simply supported

  .

• Simply-supported conditions are at each abutment and bent.

• Straight 25mm dia tendon is defined to run along the entire length of the structures. The tendon is

  A straight tendon, 25mm in diameter, runs along each length. Tendons are prestressed to 10kN (without losses) and located 0.05m from the bottom of

  the section and a prestressing force of 10kN with no losses was applied to the tendon.

...

• each section.

The purpose of this model is to:

• Determine and review

  moments and other

  internal forces resulting from prestressing.

• Verify the prestressing forces used for flexural design check.

• Compare frame-element forces to the prestressing forces

  obtained from "

  , found through the Display > Show Bridge Forces/Stresses

  " form with forces obtained from frame elements

  menu.

• Define a section cut

  cutting

  through the frame and tendon

  and frame

  ,

  get

  review forces, and compare

  them

  with

  forces obtained from

  frame and tendon

  elements at the same location.

Model Screehshots

Image Removed

See Also

• List of tendon tutorials

Attachments

• File | filename = Four bridge structures with tendons

  response at section cut locations.

Model screenshots

Flexural response is depicted in Figures 1 and 2:

Image Added

Figure 1 - Moment diagram, two-span bridge with tendon

Image Added

Figure 2 - Moment diagram, one-span bridge with tendon

Section cuts reveal that individual element forces closely correlate with those induced by prestressing.

See Also

• Hyperstatic forces for bridge-object superstructures test problem

Attachments

• SAP2000 V12.0.2 model

  .zip | title = SAP2000 V12.0.2 file (Zipped SDB file)

  (zipped .SDB file)

Metadata

• Name: Tendon force vs. frame response

• Description: Tendon application is validated by comparing tendon forces to those in an equivalent frame system.

• Program: SAP2000

• Program Version: 12.0.2

• Model ID: na