Best retrofit based on energy dissipation for a building subjected to various strong earthquake
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Date
2021
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Conference Paper
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Abstract
A Mexico City building built in 1958 located on soft soil is analyzed, which has been damaged by the 1985 Mw 8.1 and 2017 Mw 7.1 earthquakes. Buildings in the same area and similar structural systems collapsed in these earthquakes (210 in 1985 and 38 in 2017). To perform the mathematical model, a structural identification was carried out using a rebar locator and a concrete rebound hammer. The response of the building subjected to these earthquakes was analyzed, finding the changes of the stiffness of the building when plastic hinges were formed, as well as the adjustment in the period of the structure. The analysis performed are nonlinear time-history. The response of the structure shows considerable damage to several elements being at risk of collapse with another earthquake, the reason why the building is uninhabited. Therefore, reinforcements are proposed with energy dissipation which gives the building the capability to resist another earthquake like the experienced in 1985 or 2017. To determine which system is the most convenient in this case, the response of the building is compared using several energy dissipation systems; those that only provide damping to the structure, and those that provide damping and also stiffness. An important point observed was that systems that provide stiffness and damping can lead the period of the structure to coincide with the site period (2 seconds), which would cause a resonance effect, the main reason of why many near-2-second period buildings collapsed in 1985 earthquake. Therefore, it is highly recommended to carry out an analysis of this type on all buildings that have been affected by more than one strong earthquake in Mexico City.
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published
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Book title
Proceedings of the Seventeenth World Conference on Earthquake Engineering Japan 2021
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Publisher
National Information Center of Earthquake Engineering
Event
17th World Conference on Earthquake Engineering (17WCEE 2020-21)
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Subject
structural retrofit; Energy dissipation; Strong earthquake
Organisational unit
09663 - Vassiliou, Michalis (ehemalig) / Vassiliou, Michalis (former)
Notes
Conference postponed due to Corona virus (COVID-19), and rescheduled from September 13-18, 2020 to September 27 - October 2, 2021