PSI - Issue 25

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 25 (2020) 413–419

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers In this paper, an experimental set-up for uniaxial cyclic load ng is described. It was devel p d to stu y reversed cyclic mpression/ten ion loadings of innovative cementitious compos tes. To set the cyclic loading process, cylindrical pecimen of concrete were tested. All the tests w re perform d on a Zwick esting machi e w th 50 kN loa cell. Th machine was customised with accessories specifically designed to mee test requirem nts, avoiding instability and bending mom nts during the lter ating p ases of uniaxial compre sion and tension. Strain gauge ere used to measur lateral deform tions. The customized machine ha shown good p rformance so far. In ord r to t st specimen with a higher number of cycles and a higher l adi g r e, improvement t the machine are currently under development. These tests will allow greater insight into the ductility of innovative cementitious composite materials. © 2020 The Authors. Published by Elsevier B.V. This is an ope acces article under C BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers Innovative cementitious composite materials are drawing considerable interest due to their substantially improved mechanical properties as compared to ordinary cement-based materials. Their enhanced ductility is promising and particularly suited to structural applications under severe dynamic loading conditions. Cyclic response is essential to understand the effects of loading and unloading on the material, as well as to understanding how it behaves in the transition from tension to compression. It is also fundamental to identify its properties in terms of energy dissipation and strain-rate sensitivity. This paper presents the first part of an ongoing research project which aims to develop the constitutive relationship in innovative cementitious composites and its numerical implementation. Results from this research will facilitate the investigation of the ductility and durability of existing buildings. In this paper, an experimental set-up for uniaxial cyclic loading is described. It was developed to study reversed cyclic compression/tension loadings of innovative cementitious composites. To set the cyclic loading process, cylindrical specimens of concrete were tested. All the tests were performed on a Zwick testing machine with 50 kN load cell. The machine was customised with accessories specifically designed to meet test requirements, avoiding instability and bending moments during the alternating phases of uniaxial compression and tension. Strain gauges were used to measure lateral deformations. The customized machine has shown good performance so far. In order to test specimens with a higher number of cycles and a higher loading rate, improvements to the machine are currently under development. These tests will allow greater insight into the ductility of innovative cementitious composite materials. Innovative cementitious c mposite materials re rawing consid rable i terest due to their substa ti lly improved mechanical properties as compared to ordinary cement-based materials. Their enhanced ductility is pr mising particularly suite to structural applications under severe dynamic loading co diti ns. Cyclic response is esse tial to understand the effects of loading and unloading on the ma erial, as well as to understanding how t behaves in the transit on from tension to compression. It is also fundamental to iden ify its properties in terms of nergy dissipa ion and strain-rate sensi ivity. This paper presents the first part of an ongoing research project which ai s o develop t e constitut ve relatio ship in n ovativ cemen itious composites and ts n merical implementation. Results from this research will facilitate the investigation of the duc ility nd durability of existing buildings. 1st Virtual Conference on Structural Integrity - VCSI1 An experimental set-up for cyclic loading of concrete Isabella Cosentino a *, Giuseppe Andrea Ferro a , Luciana Restuccia a a Department of Structural, Construction and Geotechical Engineering - Politecnico di Torino, C.so Duca degli Abruzzi 24, Turin 10129, Italy 1st Virtual Conference on Structural Integrity - VCSI1 An experimental set-up for cyclic loading of concrete Isabella Cosentino a *, Giuseppe Andrea Ferro a , Luciana Restuccia a a Department of Structural, Construction and Geotechical Engineering - Politecnico di Torino, C.so Duca degli Abruzzi 24, Turin 10129, Italy Abstract Abstract

Keywords: innovative cementitious composites; cyclic testing; constitutive modelling. Keywords: innovative cementitious composites; cyclic testing; constitutive modelling.

* Corresponding author. Tel.: +0039 0110904849 E-mail address: isabella.cosentino@polito.it * Correspon ing author. Tel.: +0039 0110904849 E-mail address: isabella.cosentino@polito.it

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an ope acces article under C BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the VCSI1 organizers

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 10.1016/j.prostr.2020.04.046