Rapid Estimation Method of Allowable Axial Load for Existing RC Building Structures to Improve Sustainability Performance

Heejin Hwang, Keunyeong Oh, Insub Choi, Jaedo Kang and Jiuk Shin ()
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Heejin Hwang: Department of Architectural Engineering, Gyeongsang National University (GNU), Jinju-daero, Jinju-si 52828, Gyeongsangnam-do, Republic of Korea
Keunyeong Oh: Department of Building Research, Korea Institute of Civil Engineering and Building Technology, Goyang-daero, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Republic of Korea
Insub Choi: Department of Architectural Engineering, Keimyung University (KMU), Dalgubeol-daero, Dalseo-gu, Daegu 42601, Republic of Korea
Jaedo Kang: Division of Safety and Infrastructure Research, The Seoul Institute, Nambusunhwan-ro, Seocho-gu, Seoul 06756, Republic of Korea
Jiuk Shin: Department of Architectural Engineering, Gyeongsang National University (GNU), Jinju-daero, Jinju-si 52828, Gyeongsangnam-do, Republic of Korea

Sustainability, 2024, vol. 16, issue 15, 1-20

Abstract: Existing reinforced concrete building structures have low lateral resistance capacities due to seismically deficient details. Since these building structures suffer an increase in axial loads to the main structural elements due to green retrofits (e.g., installation of energy equipment/devices, roof gardens) as one of the sustainable building solutions and/or vertical extensions, their capacities can be reduced. This paper aims to propose a rapid estimation method incorporating a previously developed machine-learning model to find an allowable range of axial loads for reinforced concrete columns using simple structural details for enhancement in the sustainability performance of existing buildings in structural and energy fields. The methodology consists of two steps: (1) a machine-learning-based failure detection model, and (2) column damage limits proposed by previous researchers. To demonstrate this proposed method, an existing building structure built in the 1990s was selected, and the allowable range for the target structure was computed for both exterior and interior columns. A machine-learning-based method showed that axial loading could be increased by a factor of 1.35. Additionally, nonlinear time-history analysis for the target structure was performed to compare the seismic responses before and after applying the maximum allowable axial load. Based on the dynamic responses, the increased axial loads from green retrofits and/or vertical extensions could degrade structural performance and change its failure mode. The proposed methodology can rapidly estimate the allowable axial load range for existing reinforced concrete buildings without repeated modeling and computing processes. In addition, nonlinear time-history analysis is needed to accurately evaluate the impact of the increased axial loads from green retrofits/vertical extensions on structural performance.

Keywords: existing buildings; reinforced concrete frame building; green retrofit/vertical extension; allowable axial load range; sustainability performance (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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