RAM Concept Help

Define the post-tensioning

Post-tensioning methodology varies from country to country. In the USA it is common to use the "banding" technique for detailing tendons in two-way slabs. Banding means concentrating the tendons over support points in one direction, and distributing them uniformly in the orthogonal direction. This method is generally used in conjunction with full-panel design strips. That is, column and middle strips are not used.

In the United Kingdom, engineers are directed towards Technical Report 43 (BS8110 does not cover post-tensioned flat plates) and that document encourages the use of full panel design strips with the banding technique. This method, with bonded tendons, is used in this tutorial.

Note: RAM Concept has two layers for tendons called latitude and longitude. Refer to "Using the latitude and longitude prestressing folders" for more information.
Note: The tutorial in Chapter 49 explains the use of Strip Wizard to establish an estimate of the number of strands required for the critical band.
Note: For use of the tendon parameters layers as an alternative and perhaps quicker means of defining prestressing, please refer to "PT Flat Plate Tutorial: ACI 318-08".