PSI - Issue 64

ScienceDirect Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Procedia Structural Integrity 64 (2024) 849–856 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experimental Response of Headed Stud Shear Connectors in Steel UHP-FRC Composite Slabs Carmine Lima a, *, Marco Pepe a,b , Emidio Nigro c , Enzo Martinelli a,b a TESIS srl, Via Giovanni Paolo II 132 -84084, Fisciano, Italy - www.tesis-srl.eu Abstract Ultra High-Performance Fiber Reinforced Concrete (UHP-FRC) is widely used nowadays with the aim to obtain more resilient and sustainable structures. Specifically, interest is rising on the use of UHP-FRC for replacing existing slabs in steel-concrete bridge decks, which generally leads to a possible reduction in thickness and, consequently, results in a lower material demand. In this context, as the possibility of replacing existing slabs with UHP-FRC ones is strictly related to the effectiveness of beam-to slab connection, the present paper presents the results of an experimental campaign aimed at investigating the mechanical behavior of the shear connection between concrete slab and steel joist by performing nine push-out tests by considering the possible variation of the concrete strength class (C25/30 – C60/75 and UHP-FRC), the slab thickness (150 mm, 120 mm and 75 mm) as well as the slab steel reinforcement (unreinforced in the case of UHP-FRC). All the experimental tests were performed at the Structural Engineering Testing Hall (Str.Eng.T.H.) of the University of Salerno. Moreover, Nelson-type headed stud shear connectors (16 mm in diameter and 64 mm in height) were also considered for all the produced samples. The present contribution summarizes the results of the push-out tests and compares the different force-slip curves obtained for the three groups of tested steel-concrete stubs, in view of future developments intended at understanding their influence of global behavior of steel-concrete composite bridge decks. SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experimental Response of Headed Stud Shear Connectors in Steel UHP-FRC Composite Slabs Carmine Lima a, *, Marco Pepe a,b , Emidio Nigro c , Enzo Martinelli a,b a TESIS srl, Via Giovanni Paolo II 132 -84084, Fisciano, Italy - www.tesis-srl.eu b Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132 -84084, Fisciano, Italy c Department of Structures for Engineering and Architecture, University of Naples “ Federico II ” , Naples, Italy Abstract Ultra High-Performance Fiber Reinforced Concrete (UHP-FRC) is widely used nowadays with the aim to obtain more resilient and sustainable structures. Specifically, interest is rising on the use of UHP-FRC for replacing existing slabs in steel-concrete bridge decks, which generally leads to a possible reduction in thickness and, consequently, results in a lower material demand. In this context, as the possibility of replacing existing slabs with UHP-FRC ones is strictly related to the effectiveness of beam-to slab connection, the present paper presents the results of an experimental campaign aimed at investigating the mechanical behavior of the shear connection between concrete slab and steel joist by performing nine push-out tests by considering the possible variation of the concrete strength class (C25/30 – C60/75 and UHP-FRC), the slab thickness (150 mm, 120 mm and 75 mm) as well as the slab steel reinforcement (unreinforced in the case of UHP-FRC). All the experimental tests were performed at the Structural Engineering Testing Hall (Str.Eng.T.H.) of the University of Salerno. Moreover, Nelson-type headed stud shear connectors (16 mm in diameter and 64 mm in height) were also considered for all the produced samples. The present contribution summarizes the results of the push-out tests and compares the different force-slip curves obtained for the three groups of tested steel-concrete stubs, in view of future developments intended at understanding their influence of global behavior of steel-concrete composite bridge decks. © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers b Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132 -84084, Fisciano, Italy c Department of Structures for Engineering and Architecture, University of Naples “ Federico II ” , Naples, Italy Keywords: UHPC; Push-Out Test; Shear Connectors; Steel-Concrete slabs.

Keywords: UHPC; Push-Out Test; Shear Connectors; Steel-Concrete slabs.

* Corresponding author. Tel.: +39 089 964068. E-mail address: c.lima@tesis-srl.eu

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 10.1016/j.prostr.2024.09.358 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers * Corresponding author. Tel.: +39 089 964068. E-mail address: c.lima@tesis-srl.eu