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    Bridge

    [PDF] The Complete Guide to Pretension Strands and Debonding

    BLOG BRIDGE INSIGHT

     

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    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

     

    Mockup_블로그 콘텐츠 페이지 (2)

     

    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. 

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