PSI - Issue 17

ScienceDirect Available online at www.sciencedirect.com …‹‡…‡ ‹”‡…– Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com …‹‡…‡ ‹”‡…– Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 17 (2019) 618–623

ICSI 2019 The 3rd International Conference on Structural Integrity Transverse load influence on tensile fatigue resistance of high strength steel wires for structural applications in civil engineering Maricely De Abreu a *, Mihaela Iordachescu a , Andrés Valiente a a Materials Science Dpt., ETSI Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 3 Prof. Aranguren St., 28040, Madrid, Spain ICSI 2019 The 3rd International Conference on Structural Integrity Transverse load influence on tensile fatigue resistance of high strength steel wires for structural applications in civil engineering Maricely De Abreu a *, Mihaela Iordachescu a , Andrés Valiente a a Materials Science Dpt., ETSI Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 3 Prof. Aranguren St., 28040, Madrid, Spain Cold-drawn duplex stainless steel is an alternative to cold-drawn eutectoid steel to prevent the stress corrosion cracking risk in strands for structural uses as concrete prestressing and strand-tendons of cable stayed bridges. These possible applications create uncertainty concerning the fatigue behaviour of strand wires when subjected to the combined action of cyclic tensile loads and transverse loads that occur at the contact with the other strand wires or at the anchorages, couplers and deviators. This research compares the experimental behaviour of two cold-drawn wire types, manufactured from a lean duplex stainless steel and an eutectoid steel, when simultaneously subjected to transverse static and axial fatigue loads. The results show that the fatigue endurance required by the standards in force for prestressing steel wires, free from transverse loads are maintained by the two wire types even under transverse loads as high as 40% of their tensile strength. Cold-drawn d plex stainless steel is an alternative to cold- rawn eutectoid steel to prevent the stress corrosion cracking risk in strands for structural uses as concret prestressing and strand-tendons of cable stayed bridges. These possible applications create uncertainty concerning the fatigue behaviour of strand wires when subjected to the combined action of cyclic tensile loads and transverse loads that occur at t e c ntact with the other strand wires or at the anchorages, couplers and deviators. This research compares the experimental behaviour of two cold-drawn wire types, manufactured from a lean duplex stainless steel and an utectoid st el, when simult eously subjected to transverse static and axial fatigue loads. The results show that the fatigue endurance required by the standards in force for prestressing steel wires, free from transverse loads are maintained by the two wire types even under transverse loads as high as 40% of their tensile strength. Abstract Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: Biaxial load; Fatigue; Macro and Micro Mechanisms of Fatigue Damage; Keywords: Biaxial load; Fatigue; Macro and Micro Mechanisms of Fatigue Damage;

1. Introduction 1. Introduction

Since the end of the 70s, considerable effort has been devoted to the development of multi-wire strand-tendons for prestressing concrete and other pre or post tensioned structural application. The achieved advances have led to today's structural tendons formed by bundles of high-strength steel strands used in a large variety of civil engineering structures, especially bridges (Dywidag Systems, 2017 and BBR HiAm CONA, 2009). The most common type of strand is that manufactured from 7 high strength cold-drawn eutectoid steel wires, 6 of them Since the end of the 70s, considerable effort has been devoted to the development of multi-wire strand-tendons for prestressing concrete and other pre or post tensioned structural application. The achieved advances have led to today's structural tendons formed by bundles of high-strength steel strands used in a large variety of civil engineering structures, especially bridges (Dywidag Systems, 2017 and BBR HiAm CONA, 2009). The most common type of strand is that manufactured from 7 high strength cold-drawn eutectoid steel wires, 6 of them

* Corresponding author. Tel.: +34-910-674-312; fax: +34-913-366-680 . E-mail address: m.deabreu@upm.es * Corresponding author. T l.: +34-910-674-312; fax: +34-913-366-680 . E-mail address: m.deabreu@upm.es

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.083