Seismic fragility assessment for post-1977 high-rise reinforced concrete structures in Romania
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Seismic fragility assessment for post‑1977 high‑rise reinforced concrete structures in Romania Florin Pavel1 · Radu Vacareanu1 · Alexandra Scupin1 Received: 3 February 2020 / Accepted: 23 November 2020 © Springer Nature B.V. 2020
Abstract This study deals with the seismic fragility assessment of high-rise reinforced concrete (RC) structures in Romania designed after the major Vrancea intermediate-depth earthquake of March 4, 1977. Firstly, the evolution of Romanian seismic design codes employed before (P13-63 and P13-70) and after (P100-78/81) the Vrancea 1977 seismic event is presented. The influence of the above-mentioned seismic event on the seismic zonation of Romania is also discussed in the context of seismic design codes. Secondly, the damage information of pre-1977 high-rise RC structures during the March 4, 1977 Vrancea earthquake is presented and discussed. The seismic fragility assessment is performed by employing incremental dynamic analyses for both high-rise RC frames structures, as well as for high-rise RC shear walls structures which were widely used for residential purposes. For incremental dynamic analyses, ground motion datasets characteristic for the seismic conditions of Romania are selected and further employed. The results of the analyses show an increase of 30–40% of the median peak ground acceleration corresponding to various damage states for post-1977 RC frames and RC shear walls structures, as compared to the pre-1977 ones. Keywords Vrancea intermediate-depth seismic source · Seismic fragility · Seismic design code · Structural typology
1 Introduction The 1977 Vrancea intermediate-depth earthquake caused significant damage and human losses in the entire southern and eastern part of Romania. Among the most affected cities, besides Bucharest, one can mention Iasi and Ploiesti, the latter one being situated close to the epicentre of the earthquake. A thorough discussion regarding the economic and human losses at country level, as well as the earthquake impact on the development of Romania in the years following the seismic event can be found in the papers of Georgescu and Pomonis * Florin Pavel [email protected] 1
Seismic Risk Assessment Research Centre, Technical University of Civil Engineering Bucharest, Bd. Lacul Tei, 122‑124 Bucharest, Romania
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Bulletin of Earthquake Engineering
(2008, 2018). Additional relevant information regarding this major Vrancea seismic event can be found in the papers of Sandi and Vasilescu (1982), Sandi (1985, 1986) or Lungu et al. (2000). Recently unveiled reports (e.g. IPB (1977, 1978); INCERC (1987)) bring new relevant information regarding the damage of various structures during the 1977 and 1986 Vrancea intermediate-depth earthquakes. This study is focused on three main parts, namely: (i) evaluation of the damage surveys performed on high-rise reinforced concrete (RC) structures after the Vrancea 1977 intermediate-depth earthquake, and (ii) evaluation of the seismic fragility of cast-in-place high-rise post-1977 RC struct
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