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51315-5461-Wire/Strand Slippage in Anchorages—A Potential Failure Mode for Corroding Post-Tensioning Tendons

Picture for Wire/Strand Slippage in Anchorages—A Potential Failure Mode for Corroding Post-Tensioning Tendons
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Product Number: 51315-5461-SG
ISBN: 5461 2015 CP
Author: William Hartt
Publication Date: 2015
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A forensic investigation of unbonded post-tensioning (PT) tendons on a large structure revealed relatively advanced levels of strand corrosion within and inboard of anchorages. In addition to concerns that this corrosion could result in wire and strand fractures and hence tendon failures instances were disclosed where corrosion in anchorages was sufficiently advanced that wires had disengaged from the wedge grips and elastically contracted with consequent stress reduction. While this apparently transpired in conjunction with contiguous tendon removal activities it is probable that the disengagements and resultant slippages were on the verge of occurring anyways. Such slippage constitutes a potential failure mechanism for corroding PT systems either unbonded or bonded that has not previously been disclosed.
A forensic investigation of unbonded post-tensioning (PT) tendons on a large structure revealed relatively advanced levels of strand corrosion within and inboard of anchorages. In addition to concerns that this corrosion could result in wire and strand fractures and hence tendon failures instances were disclosed where corrosion in anchorages was sufficiently advanced that wires had disengaged from the wedge grips and elastically contracted with consequent stress reduction. While this apparently transpired in conjunction with contiguous tendon removal activities it is probable that the disengagements and resultant slippages were on the verge of occurring anyways. Such slippage constitutes a potential failure mechanism for corroding PT systems either unbonded or bonded that has not previously been disclosed.
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ISBN: 7121 2016 CP
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There are advantages to Post-tensioned (PT) concrete construction compared to conventional reinforcement.  However, corrosion caused tendon failures have recently been reported d/t chemically and/or physically deficient grout. A predictive model has been developed that projects onset and rate of wire and strand fractures.
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