Rubini, G;
Suarez, D;
Gentile, R;
Galasso, C;
(2023)
Seismic retrofit of reinforced concrete frames by direct loss-based design.
In:
Procedia Structural Integrity.
(pp. pp. 1840-1847).
Elsevier
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Abstract
This paper introduces a procedure for the retrofit design of reinforced concrete (RC) frame buildings to achieve the desired target level of earthquake-induced loss for a given seismic hazard profile. The methodology is "direct" because the loss target is specified in the first step of the procedure, and, in principle, no design iterations are required. The target loss level is defined based on designer/client preferences and/or external constraints (e.g., foundation capacity). The proposed procedure relies on a simplified loss assessment enabled by a surrogate model defining the probability distribution of the seismic deformation demands of single degree of freedom (SDoF) systems given different ground-motion intensity levels. Combined with a hazard curve and a building-level damage-to-loss model, such a surrogate model is used to map candidate SDoF force-displacement curves to their earthquake-induced loss by assuming a given retrofit strategy. In this case, the considered retrofit strategy involves changing the frame's local hierarchy of strength to ensure a global plastic structure mechanism. Under such assumptions, a designer can select a design force-displacement curve among those that comply with the chosen loss target. The detailing of the retrofitted frame is carried out according to the direct displacement-based design principles and the Simplified Lateral Mechanism Analysis (SLaMA). The procedure is applied to an under-designed RC frame building retrofitted with concrete jacketing. A benchmark loss estimate is calculated using non-linear time-history analyses for loss assessment purposes. The proposed procedure shows satisfactory compliance with the benchmark loss, emphasising the procedure's effectiveness in practice.
| Type: | Proceedings paper |
|---|---|
| Title: | Seismic retrofit of reinforced concrete frames by direct loss-based design |
| Event: | XIX ANIDIS Conference, Seismic Engineering in Italy |
| ISBN-13: | 9781713870418 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.prostr.2023.01.235 |
| Publisher version: | https://doi.org/10.1016/j.prostr.2023.01.235 |
| Language: | English |
| Additional information: | © 2023 The Author(s). Published by Elsevier B.V. under a Creative Commons license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | retrofit, loss, reinforced concrete, jacketing, loss-based design |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10171404 |
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