Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: L'aquila

Sortuj według:

Ogranicz wyniki do:

Non-Ergodic Probabilistic Seismic Hazard Methodology Using Physics-Based Ground Motion Prediction: the Case of L'Aquila, Italy

Aguirre Jedidiah Joel, Rubino Bruno, Vassallo Maurizio, Di Giulio Giuseppe, Visini Francesco

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2020

Vol. 24, No 2

97--185

A non-ergodic probabilistic seismic hazard analysis (PSHA) utilizing the physics-based ground motion prediction was proposed in this study to minimize the increasing uncertainties in the use of empirical equations. The City of L’Aquila in Italy was used for illustrative purposes due to the availability of data and the historical seismicity of the site. A total of 28 seismic sources were identified in this study located within a 100 km radius from the city. Fault properties such as geometry and location were obtained from the literature, while the fault occurrence rates were obtained using the FiSH Code. A modified time-weakening friction law was proposed to model the seismic energy released by an earthquake. Uncertainties in different rupture scenarios were characterized through the Guttenberg-Richter Relations and the Characteristic Brownian Time Passage. Uncertainties in distances were characterized through probability mass functions, which were used to calculate the ground motion exceedance probabilities. The 1D elastodynamic equation coupled with the Hooke’s law was used to predict the peak ground acceleration (PGA), a measure of the ground shaking level. A hazard curve, which is a plot of PGA and its recurrence, was constructed and compared with the results of the study of Valentini, et al., AGU 100: Advancing Earth and Space Science (2019). The method proposed in this study predicts a higher hazard rates for PGAs less than 0.70 g, which implies that the ground motion was overestimated for very far sources. In contrast, lower hazard curves were observed for PGAs greater than 0.70g which can be attributed to fewer seismic sources considered in this study.

Injured architectural heritage in L'aquila after the earthquake 2009: some general remarks

Di Tommaso A.

Wiadomości Konserwatorskie

2009

Nr 26

177-185

In this paper some aspects of 2009 strong earthquake in Abruzzo Region have been analysed. First of all a reflection on the causes of so big disaster induced to evaluate a strong vulnerability of masonry due to typology of its texture and poor mortars. A second topic examined is the advancement of first aid to collapsing building: new materials, new structural systems and recent mechanical lifting de- vices made this chapter totally different from previous ones relative to past earthquakes in middle Italy. Last part is devoted to the problem of Re- Construction: seems consistent to rebuild the monument with a reinforced masonry, named "banded masonry" to reduce drastically the vulnerability of constructions, preserving the peculiar character.

Artykuł przedstawia analizę niektórych aspektów silnego trzęsienia ziemi, które nawiedziło region Abruzji w 2009 r. Ustalono, że jego katastrofalne skutki spowodowane były dużą podatnością tamtejszych konstrukcji murowanych (ściany szczelinowe z kamieni słabo powiązanych zaprawą) na zawalenie się. Drugi temat to postęp, jaki dokonał się w dziedzinie pierwszej pomocy w ratowaniu budynków zagrożonych zawaleniem. Nowe materiały, nowe układy konstrukcyjne i nowoczesne urządzenia podnoszące sprawiły, że ten etap przebiegł nieporównywalnie lepiej niż w poprzednich trzęsieniach ziemi, które nawiedziły środkowe Włochy. Ostatnia część referatu dotyczy problemu odbudowy. Wydaje się, że odpowiednim rozwiązaniem jest zastosowanie tzw. muru pasemkowego w celu radykalnego zmniejszenia podatności budynków na zawalenie się, a jednocześnie zachowania ich szczególnego charakteru.