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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
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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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