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Potential of remote sensing data to support the seismic safety assessment of reinforced concrete buildings affected by slow‑moving landslides

Mele Annalisa, Miano Andrea, Di Martire Diego, Infante Donato, Ramondini Massimo, Prota Andrea

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 2

art. no. e88, 1--22

Different forms of hazard can affect structures throughout their existence. The occurrence of a seismic event in areas exposed to different risks or already affected by other phenomena is highly likely, especially in countries characterized by high seismicity and equally high hydrogeological risk, as Italy. Nevertheless, the seismic safety assessment of reinforced concrete (RC) structures is commonly carried out considering the seismic action only, generally applied to an analytical model, neglecting the stress-strain state induced by previous ongoing phenomena. The aim of this work is to highlight the importance of the seismic safety assessment in a multi-hazard analysis, cumulating the action coming from two different hazards: landslide and earthquake. An existing RC building, located in an area affected by an intermittent landslide phenomenon with slow kinematics, that may also be subjected to strong earthquakes, is used as case study. The Differential Synthetic Aperture Radar Interferometry (DInSAR) approach is used to monitor the evolution in time of the landslide. DInSAR deformation data are used to detect surface ground movements applied to building foundations. A non-linear static analysis procedure is implemented for the code-based seismic safety assessment, in two different scenarios. The seismic assessment of the case-study building is implemented in a condition of structure deformed only for gravity loads, and, then, in a state of known landslide-induced deformed configuration. A comparison is proposed between the building seismic safety assessment per-formed in both cases, with or without the consideration of the landslide-induced displacements, showing the importance of a multi-hazard evaluation.

Optimizing the seismic effects of blasting in quarries by timing

Baulovič Ján, Pandula Blažej, Kondela Julián, Prekopová Marta

Materiały Wysokoenergetyczne

2019

T. 11(2)

48--62

Recently, negative effects of the blasting operations and quantification of the seismic safety are regarded as very important technical problem in quarries. The impact of blasting operations is accompanied by both positive and negative seismic effects. For example, vibrations generated by explosion create very positive effect − when help to break the rocks, but, on the other hand, also result in negative effect − when affect constructions and natural environment in the vicinity of a blasting works site. If the vibrations are large enough, then the nearby objects could be damaged or destroyed. This article highlights the results of the blasting operation monitoring in limestone Lopušné Pažite quarry on Slovakia, which based on the rule that the negative effects depend on their range and strength. This method is applied in all quarries in Slovakia, which are close to settlements.

Współcześnie, niepożądane skutki prac strzałowych oraz ilościowa ocena bezpieczeństwa sejsmicznego są szczególnie ważnym tematem badawczym w górnictwie odkrywkowym. Prowadzeniu prac strzałowych towarzyszą zarówno pożądane, jak i niekorzystne efekty sejsmiczne, np. drgania generowane wybuchem powodują z jednej strony efekt pożądany, czyli pozwalają na kruszenie skał, jednak z drugiej strony zagrażają konstrukcjom i środowisku naturalnemu w otoczeniu miejsca prowadzenia prac strzałowych. Jeżeli drgania są wystarczająco silne, wtedy konstrukcja pobliskich obiektów może zostać uszkodzona, lub obiekty te mogą ulec całkowitemu zniszczeniu. W pracy przedstawiono wyniki monitoringu prac strzałowych wykonanych w kopalni odkrywkowej wapienia w Lopušné Pažite (Słowacja), które bazują na zasadzie, że skala oddziaływania efektów niepożądanych zależy od zasięgu ich oddziaływania i siły. Zaprezentowana metoda jest stosowana we wszystkich kamieniołomach na Słowacji, w pobliżu których znajdują się obszary zamieszkane.

Acceleration generating corresponding to the proposed response spectra

Dupal J.

Modelowanie Inżynierskie

2012

T. 14, nr 45

39--44

Nuclear devices are checked also from the seismic safety point of view. The response spectra method is one of the most important approaches to obtain an upper estimation of some output variables like displacements, velocities, accelerations, stresses etc. The proposed response spectra of the base especially accelerations serves as an input for extreme estimations of mentioned output quantities depending on frequency [1]. The alternative approach for functionality assessment can be used the base acceleration as an input for time integration of the mathematical model and the output quantities can be obtained in the direct integration way of the model. The main requirement on the input acceleration is posed on the desired response spectrum satisfaction. The paper deals with an approach to generation of the base acceleration in such a way to be satisfied the properties of the proposed prescribed response spectrum of the acceleration.

Bezpečnost jaderných zařízení je kontrolována mimo jiné také ze seizmického hlediska. Metoda spekter odezvy patří mezi nejdůležitější metody pro určení horního odhadu výstupních veličin, za které považujeme posuvy, rychlosti, zrychlení, napětí atd. Presentovaný přístup pro posouzení funkčnosti využívá zrychlení základu odpovídající návrhovému spektru odezvy jako kinematické buzení matematického modelu a výstupní veličiny lze získat přímou integrací.