Please fill out the Download Section (Click here) below the Comment Section to download the Ebook!

Do you know about Pretension Strands and Debonding?

Most engineers face issues deciding the number, position, and debonding of tendons in a pre-tensioned concrete bridge. At the beam’s ends, the prestressing strands can result in unwanted internal stresses and cracking. Debonding reduces the undesirable transfer stresses towards the ends of the beam.

Through this eBook, you can learn the different ways of modeling Pretensioned strands in midas civil. Also, various code clauses for Debonding of Tendons and Debonding provisions in midas Civil is explained. An illustrative example is provided to help you understand the result variation between a debonded and bonded tendon

Key Points

01. Pre-tensioning of Concrete and Debonding Advantages

    01-1. Introduction

              Pre-tensioning

              Post-tensioning

                      a) Internal (Pre-Tension)

                      b) Internal (Post-Tension)

                      c) External

02. Ways of Modelling Pretension Strands in midas Civil

   Pretension in midas Civil can be applied to beam elements only. It is a three-step process.
   Tendon Property -> Tendon Profile -> Tendon Prestress

       02-1. Tendon Property

       02-2. Tendon Profile

   There are 4 ways by which Tendon Profile can be generated in midas Civil. 

                     02-2-1. By coordinate 

                     02-2-2. By Wizard

                     02-2-3. Tendon Profile Generator

                     02-2-4. Tendon Template

03. Code Clauses for Debonding of Tendons
      03-1. IRC SP 71, 2018

      03-2. AASHTO LRFD 2012
                Bridge Design

                Specifications

04. Debonding Provisions in midas Civil

       04-1. Debonding during Tendon Coordinate Profile Generation 

       04-2. Debonding using Change Tendon Profile option

05. Example Problem

06. Summary

Prestressing the concrete bridge beams contributes to resisting the tensile stresses caused by the traffic loads and the beam's weight. It offers various benefits, such as increasing concrete members' capacity, reducing the concrete member section, and increasing the span lengths for bridges. However, the stressing of bridge beam ends can result in unwanted cracks. Therefore, civil engineering codes call for debonding a specific portion of the strands at the beam end to minimize the stresses and reduce cracks.