Scalvenzi, M;
Gargiulo, S;
Freddi, F;
Parisi, F;
(2022)
Impact of seismic retrofitting on progressive collapse resistance of RC frame structures.
Engineering Failure Analysis
, 131
, Article 105840. 10.1016/j.engfailanal.2021.105840.
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Scalvenzi et al_2022_Impact of seismic retrofitting on progressive collapse resistance of RC frame structures - Author's Version.pdf - Accepted Version Download (1MB) | Preview |
Abstract
Most of the existing buildings in seismic prone regions have been built before the publication of modern design provisions against earthquakes, resulting in the need for structural retrofitting. Furthermore, some of those buildings are also subjected to additional hazards that may be either triggered by earthquakes (e.g., landslides, soil liquefaction, tsunamis) or associated with other natural or anthropogenic events, such as floods, vehicle collision, blast, and fire. A multi-hazard performance assessment of building structures is thus of paramount importance to implement integrated retrofit strategies, which otherwise would not be economically sustainable if oriented to structural risk mitigation against a single hazard. While retrofit strategies to improve the seismic performance of reinforced concrete (RC) structures have been widely investigated, structural retrofitting against progressive collapse has received very little attention. Within this context, the present paper illustrates a numerical investigation on the influence of seismic retrofitting on structural robustness of a four-storey, five-bay, RC frame building designed only to gravity loads. Seismic performance and structural robustness were respectively evaluated in OpenSees through pushover and pushdown analyses of a fibre-based finite element model. Structural robustness was evaluated under two relevant column-removal scenarios, i.e., the sudden loss of a central and a corner column, whereas earthquake resistance was assessed according to the N2 method, evidencing the need for seismic retrofitting. A retrofit measure based on carbon fibre reinforced polymers was then considered to avoid premature brittle failures. Analysis results show that this retrofit strategy was able to increase both seismic safety and structural robustness. Subsequently, a parametric analysis was carried out in order to evaluate the impact of beam span length and shear strength of the retrofitting system.
| Type: | Article |
|---|---|
| Title: | Impact of seismic retrofitting on progressive collapse resistance of RC frame structures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.engfailanal.2021.105840 |
| Publisher version: | https://doi.org/10.1016/j.engfailanal.2021.105840 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Progressive collapse, Robustness, Seismic resistance, Reinforced concrete buildings, Structural retrofitting |
| 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 Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10138173 |
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