PSI - Issue 52

ScienceDirect Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 52 (2024) 72–88 Structural Integrity Procedia 00 (2022) 000 – 000

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2452-3216 © 2023 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 Professor Ferri Aliabadi 10.1016/j.prostr.2023.12.008 2452-3216 © 2023 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 Professor Ferri Aliabadi 2452-3216 © 2023 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 Professor Ferri Aliabadi © 2023 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 Professor Ferri Aliabadi Abstract Construction of hybrid or mixed housing typologies with non-engineer solutions has become a common practice in developing countries, such as India. Which in turn affects the service life of the structure and ultimately leads to early failure. However, during the design life of a structure, it is important to investigate the risk posed by multiple parameters such as a sudden change in functional utility, exposure to natural hazards, modifications, and/or expansions in the existing structure. One such case is studied in detail, where a thirty-year-old single-story reinforced concrete building (existing building) is extended to a three-story structure (modified building) leading to multiple structural element damages in the existing building over a period of one year. To evaluate the reasons behind structural elements' damage and reduce the risk of sudden failure, a detailed investigation is carried out based on Non-destructive methods. A numerical model has been developed using Non-destructive testing (NDT) results for estimating the current load-carrying capacity of the structure and results obtained show that there is a load-carrying deficiency in structural elements of the existing building. To enhance both load carrying capacity and service life of the structure, considering site challenges, both composite and encasement retrofitting scheme has been proposed and executed to make the building in a serviceable state. Keywords: Service life, RCC building, Non-destructive testing, Numerical model, Retrofitting, and Serviceable state. 1. Introduction Evaluating the current condition of structures has become essential to understand the operational condition of infrastructure due to the continuing degradation caused by human or natural parameters (Wardhana et al. (2003)). Proper and continuous maintenance enhances public safety and also the economy of the nation. The structure's service life could not endure as long as it was designed, despite degradation being a natural process. Abstract Construction of hybrid or mixed housing typologies with non-engineer solutions has become a common practice in developing countries, such as India. Which in turn affects the service life of the structure and ultimately leads to early failure. However, during the design life of a structure, it is important to investigate the risk posed by multiple parameters such as a sudden change in functional utility, exposure to natural hazards, modifications, and/or expansions in the existing structure. One such case is studied in detail, where a thirty-year-old single-story reinforced concrete building (existing building) is extended to a three-story structure (modified building) leading to multiple structural element damages in the existing building over a period of one year. To evaluate the reasons behind structural elements' damage and reduce the risk of sudden failure, a detailed investigation is carried out based on Non-destructive methods. A numerical model has been developed using Non-destructive testing (NDT) results for estimating the current load-carrying capacity of the structure and results obtained show that there is a load-carrying deficiency in structural elements of the existing building. To enhance both load carrying capacity and service life of the structure, considering site challenges, both composite and encasement retrofitting scheme has been proposed and executed to make the building in a serviceable state. Keywords: Service life, RCC building, Non-destructive testing, Numerical model, Retrofitting, and Serviceable state. 1. Introduction Evaluating the current condition of structures has become essential to understand the operational condition of infrastructure due to the continuing degradation caused by human or natural parameters (Wardhana et al. (2003)). Proper and continuous maintenance enhances public safety and also the economy of the nation. The structure's service life could not endure as long as it was designed, despite degradation being a natural process. * E-mail address: rakesh20pcie002@mahindrauniversity.edu.in Fracture, Damage, and Structural Health Monitoring Retrofitting and Strengthening of an RCC Building – A Case Study of Mixed Housing Typology Rakesh Katam a* , Sairam Neridu a , Ajay Kumar Sreerama b , Venkata Dilip Kumar Pasupuleti a , Prafulla Kalapatapu a a Ecole Centrale School of Engineering, Mahindra University, Hyderabad, 500034, India b Mantis Infra Solutions Pvt Ltd, Hydera, 500034, India Fracture, Damage, and Structural Health Monitoring Retrofitting and Strengthening of an RCC Building – A Case Study of Mixed Housing Typology Rakesh Katam a* , Sairam Neridu a , Ajay Kumar Sreerama b , Venkata Dilip Kumar Pasupuleti a , Prafulla Kalapatapu a a Ecole Centrale School of Engineering, Mahindra University, Hyderabad, 500034, India b Mantis Infra Solutions Pvt Ltd, Hydera, 500034, India * E-mail address: rakesh20pcie002@mahindrauniversity.edu.in