PSI - Issue 64

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 64 (2024) 1376–1385

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Flexural strengthening of a bridge deck slab using near surface mounted CFRP rods Tom Argyle a , James Kilcran a , Ross Wright a , Fabio P. Figueiredo a, * a AtkinsRéalis, Woodcote Grove Ashley Rd, Epsom KT18 5BW, UK Abstract Swanley I/C East and West form part of the M25 Junction 3 interchange roundabout at Swanley in the UK. They are similar three span reinforced concrete beam and slab bridges with integral inclined piers. The soffits of the side spans of the structure started cracking soon after it opened in 1977 due to insufficient reinforcement in the deck. To remedy this, steel strengthening plates were bonded to the soffit of the side spans and to the top surface of the deck over the piers in the hogging regions. The bridges have, in recent years been subject to Interim Measures Management regime following concerns over potential debonding to the steel plates bonded to the deck surface. During the management regime a strengthening rehabilitation / replacement scheme has been developed to replace the existing steel plates in the hogging regions with a new CFRP strengthening system composed of Near Surface Mounted Rods. An extensive Early Contractor Involvement (ECI) and design development process has been undertaken to determine a solution that can be built in a sequence that allows the existing structure to remain open to a lane of traffic during the works. This paper presents the design, challenges and lessons learnt of the Swanley I/C East bridge rehabilitation using a solution, which completed construction in November 2023. © 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 Keywords: Bridge; Concrete; Strengthening; FRP; NSM © 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.: +44-1372-752014 E-mail address: Fabio.Figueiredo@atkinsrealis.com

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 10.1016/j.prostr.2024.09.375