Wyniki wyszukiwania - Biblioteka Nauki

1

Effects of earthquake induced pounding between superstructure segments in elevated bridge.

100%

Jankowski R.

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2001

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tom nr 56

109-122

PL

Celem artykułu jest analiza zderzeń pomiędzy przęsłami estakady mostowej, wywołanymi efektem propagacji fali sejsmicznej i zaproponowanie metod reduk-cji efektów kolizji. Analizę przeprowadzono na uproszczonym modelu konstruk-cji z zastosowaniem elementów symulujących zderzenia. Wyniki analizy pokaza-ły, że kolizje mogą mieć znaczny wpływ na zachowanie konstrukcji. Dalsza analiza pokazała, iż redukcję skutków kolizji mozna osiągnąć stosując spec- jalne łączniki pomiędzy przęsłami.

2

Trzęsienia ziemi w Obwodzie Kaliningradzkim, 21 września 2004

100%

Wiejacz P. , Dębski W.

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tom Z. 1-2

77-90

EN

On 21 September 2004 the northeastern area of Poland has experienced two unusual earthquakes of magnitudes 5.0 and 5.3. The earthquakes have originated in the nearby Kaliningrad Region, Russia, across the state border. Although the damages were minor and no casualties have been reported in Poland, the appearance of such earthquakes in an area otherwise considered non-seismic and totally safe has caused much concern among of relief services and general population. The earthquakes will naturally cause reassessment of the seismic hazard for this area and will be subject to scientific analysis. This paper summarizes those investigations of the events that result from everyday seismological observatory routine, providing information on location and magnitude of the events. The source mechanism is also being discussed. The results are an evidence that the Kaliningrad Region is a seismically active area, even though the earthquakes happen relatively seldom and do not reach devastating size.

3

Earthquake ground motion scenarios in urban areas: the case of the city of Thessaloniki (Northern Greece)

75%

Roumelioti Z. , Kiratzi A. , Theodulidis N. , Panou A. , Savvaidis A. , Benetatos C.

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tom z. 5/80

303--317

4

Hybrid-Empirical Ground Motion Estimations for Georgia

75%

Tsereteli N. , Askan A. , Hamzehloo H.

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2016

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tom Vol. 64, no. 5

1225--1256

EN

Ground motion prediction equations are essential for several purposes ranging from seismic design and analysis to probabilistic seismic hazard assessment. In seismically active regions without sufficiently strong ground motion data to build empirical models, hybrid models become vital. Georgia does not have sufficiently strong ground motion data to build empirical models. In this study, we have applied the host-totarget method in two regions in Georgia with different source mechanisms. According to the tectonic regime of the target areas, two different regions are chosen as host regions. One of them is in Turkey with the dominant strike-slip source mechanism, while the other is in Iran with the prevalence of reverse-mechanism events. We performed stochastic finite-fault simulations in both host and target areas and employed the hybrid-empirical method as introduced in Campbell (2003). An initial set of hybrid empirical ground motion estimates is obtained for PGA and SA at selected periods for Georgia.

5

Zastosowanie metodologii geodezji naturalnej w predykcji trzęsień ziemi (na przykładzie trzęsienia Virginia 23.08.2011)

75%

Adamczewski Z.

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tom R. 86, nr 1

3--7

PL

Wobec rozwoju metod opracowania coraz liczniejszych zbiorów obserwacji, np. w postaci „chmur punktów”, dystans interpretacyjny otrzymywanych wyników do rzeczywistości zwiększa się czasem tak znacznie, że zastosowany model trudno odróżnić od metafory. W niniejszej pracy powracamy do korzeni tych metod, pokazując, na konkretnym przykładzie – zaskakującego trzęsienia w pobliżu Waszyngtonu w sierpniu 2011 r., zastosowanie najprostszego modelu „naturalnego”, skracającego dystans interpretacyjny.

EN

Considering the development of processing methods of sets of observations of growing numbers of elements, such as "point cloud", it may be stated that the interpretation distance between obtained results and the reality is so increased that it is difficult to distinguish between the applied model and a metaphor. In this paper the authors return to the roots of those methods and present - using the selected example of the surprising earthquake which happened close to Washington in August 2011 - utilisation of the simplest "natural" model, which shortens interpretation distance.

6

Seismotectonic investigations

75%

Komatina-Petrovic S. , Stanic S.

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tom z. 5/80

445--450

7

New geotectonic monographs on the regions of Bulgaria related to the eartquakes in 1904 and 1928

75%

Milev G. , Śledziński J. , Vyskočil P.

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tom z. 2/57

107-113

EN

One of the main objectives of the second phase of the Project CERGOP-2 (Central Europe Regional Geodynamics Project) is to continue studies on geotectonic regions of Central Europe. A special study group CSG.5 "Geotectonic analysis of the region of Central Europe" was established in 1999 to coordinate the geodynamic research in the frame of the project CERGOP. There are several groups of scientists carrying out the research on particular regions of Europe. A spectacular evident achievement of such a work within the second phase of the Project CERGOP-2 was the publication of two volumes of geotectonic monographs on two Bulgarian regions Krupnik-Kresna and Chirpan-Plovdiv related to the earthquakes occurred in 1904 and 1928. The monographs were published in 2000 in the series REPORTS ON GEODESY edited by the Institute of Geodesy and Geodetic Astronomy of the Warsaw University of Technology Poland. This is the nice example of joint work of Bulgarian scientists -geodesists, geologists and geophysicists. The paper contains a short outline of the new organisation of geodynamic research within the project CERGOP (Central Europe Regional Geodynamics Project) and the contents of both Bulgarian monographs.

8

Analiza numeryczna zachowania się odłącznika wysokiego napięcia SGF 245 poddanego obciążeniom sejsmicznym

75%

Dembowski P. , Jankowski R.

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2010

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tom R. 107, z. 3-B

23-29

PL

Przedstawiono wyniki analizy numerycznej zachowania się odłącznika wysokiego napięcia SGF 245 podczas trzęsienia ziemi. W analizie zastosowano model odłącznika zaimplementowany w programie MES. W pierwszym etapie wykonano analizę modalną w celu weryfikacji dokładności modelu numerycznego. Następnie przeprowadzono dokładną nieliniową analizę dynamiczną przy wystąpieniu wymuszenia opisanego składową NS trzęsienia ziemi El Centro z 1940 roku. Wyniki analizy dowodzą, że krytycznym miejscem konstrukcji jest połączenie pomiędzy kolumną a ramą podstawy, w którym to zaobserwowano największe wartości naprężeń.

EN

The aim of the paper is to show the results of the numerical analysis focused on the behaviour of the high voltage disconnector SGF 245 under earthquake excitation. In the study, the FEM model of the analysed structure has been investigated. First, the modal analysis has been conducted so as to verify the accuracy of the numerical model. Then, the detailed nonlinear dynamic analysis has been carried out under the NS component of the El Centro earthquake of 1940. The results of the study show that the connection between the column and the base is the most critical location, in which the highest levels of stress have been observed.

9

Analysis of the spatial distribution between successive earthquakes occurred in various regions in the world

63%

Marekova E.

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tom Vol. 62, no. 6

1262--1282

EN

The earthquake spatial distribution is being studied, using earthquake catalogs from different seismic regions (California, Canada, Central Asia, Greece, and Japan). The quality of the available catalogs, taking into account the completeness of the magnitude, is examined. Based on the analysis of the catalogs, it was determined that the probability densities of the inter-event distance distribution collapse into single distribution when the data is rescaled. The collapse of the data provides a clear illustration of earthquake-occurrence self-similarity in space.

10

Zagrożenia geologiczne w Polsce w 2020 roku

63%

Wojciechowski T. , Laskowicz I. , Nescieruk P. , Marciniec P. , Uścinowicz G. , Czerwiński T. , Perski Z.

Przegląd Geologiczny

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2021

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tom Vol. 69, nr 5

303--311

EN

The paper describes geohazard events that took place in 2020 on the territory of Poland. The PGI is responsible for geohazard monitoring in four areas of interest :landslides and mass movements within the Landslide Counteracting System (LCS, SOPO in Polish), earthquakes within the Geodynamical Monitoring of Poland and ground motions within the Interferometric Terrain Deformations Monitoring of Poland, and coastal monitoring carried out by the Marine Geology Branch within a framework of the 4D Cartography. In 2020, there were no spectacular geohazard events; however, there were some permanently active phenomena, mostly landslides, which caused significant damages to the infrastructure.

11

Osuwiska Karpat

63%

Poprawa D. , Rączkowski W.

Przegląd Geologiczny

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2003

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tom Vol. 51, nr 8

685-692

PL

W artykule omówiono zagrożenia wypływające ze środowiska geologicznego Karpat, ze szczególnym uwzględnieniem osuwisk. Ponad 95 % osuwisk występujących w Polsce znajduje sie na terenie Karpat. Osuwiska po raz pierwszy w 2002 roku zostały zaliczone do zjawisk powodujących klęski żywiołowe. Prace Rządu RP zaowocowały propozycjami zmian w kilku Ustawach. Mają one polegać na wprowadzeniu uwarunkowań związanych z ruchami masowymi m.in. w planowaniu i zagospodarowaniu przestrzennym.

EN

Hazards resulting from the geological environment of the Carpathians, with particular emphasis on landslides, have been discussed because over 95% of all landslides in Poland occur in the Flysch Carpathians. In 2002, landsliding was officially included in the list of events causing a natural disaster for the first time. Efforts of the Polish government yield to proposals of changes in certain legal acts. Landsliding risk must be considered in spatial planning and management. This is likely the best method of mitigating the related hazards.

12

Seismologic investigations

63%

Stanic I. , Komatina-Petrovic S.

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tom z. 5/80

441--444

13

Monitoring of active faults along the Strouma fault zone, SW Bulgaria

63%

Dobrev N. , Frangov G. , Drakatos G.

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tom z. 5/80

195--198

14

Expected peak ground accelerations for selected sites of the telecommunication network in Crete (S. Greece)

63%

Papaioannou C. , Kontogianni V. , Stiros S. C.

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tom z. 5/80

353--361

15

Zaawansowane symulacje numeryczne MES dynamiki mostów z wykorzystaniem procedury explicit

63%

Miśkiewicz M. , Bruski D. , Chróścielewski J. , Wilde K. , Grębowski K.

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tom nr 1

38--41

PL

Dostęp do mocy obliczeniowej super komputerów oraz możliwość wykorzystania nowoczesnych systemów, np. takich jak Ls-Dyna, pozwala na uzyskanie niezwykle szczegółowych rozwiązań bardzo skomplikowanych problemów inżynierskich.

EN

The article presents some remarks on the dynamic simulations of bridges in the Ls-Dyna system. Some results of two dynamic problems are presented. The first example concerns a viaduct that was hit by a vehicle passing under it. The second one relates to the design of a concrete multi-span bridge subjected to earthquakes of various intensity.

16

On the geodynamics of Bulgarian lands through seismological data

63%

Botev E. , Slejko D. , Bressan G. , Bragato P. , Glavcheva R.

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tom z. 5/80

149--168

17

Provadia region in Bulgaria - natural or induced seismicity?

63%

Botev E. , Glavcheva R. , Matova M.

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tom z. 5/80

247--255

18

Evaluating main parameters effects of near-field earthquakes on the behavior of concrete structures with moment frame system

63%

Jouneghani K. T. , Hosseini M. , Rohanimanesh M. S. , Dehkordi M. R.

Advances in Science and Technology. Research Journal

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2018

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tom Vol. 12, no 3

10--23

EN

Amplitude and frequency content are two important features of earthquakes that are different for near and far-fault earthquakes and in most of the standards, the effects of near-field earthquakes in loading are not considered. Therefore, study and comparison of these effects on structures is necessary. In this paper, structural operation against near and far fault earthquakes for two near sites and two far sites is investigated. For this purpose and in order to achieve an operation point of a structural model with six staircases with a mean lateral bending frame resistant system seismic hazard information is analyzed with regards to special plan spectrums of 2 different sites using near and far faults. An evaluation of the effects due to near and far fault earthquakes based on the Iran’s standard 2800 ranges on operation point and the comparison of operation effects of near and far fault spectrums with Iran’s standard are results of this research work. After the presentation of results obtained from time history analyses, some suggestions are proposed for design correction based on the regulations in near -field earthquakes.

19

Zagrożenia geologiczne w Polsce w 2021 roku

51%

Wojciechowski T. , Laskowicz I. , Kos J. , Marciniec P. , Uścinowicz G. , Przyłucka M. , Wódka M.

Przegląd Geologiczny

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2022

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tom Vol. 70, nr 9

617--626

EN

Geological hazards caused by landslides, earthquakes, erosion, land surface deformation and collapse in 2021 in Poland were among the average compared to recent years. They did, however, affect material losses. The Polish Geological Survey (PGS) recorded 41 events related to sudden landslide activations, which damaged or destroyed 17 road sections. Through ongoing monitoring of 72 landslides, 33 were shown to be active. In 2021, more than 5,200 landslides were identified and inventoried in Poland. Geodynamic monitoring performed by PGS recorded 611 seismic events in Poland, whose magnitudes reached M4.2. In addition, using satellite radar interferometry, continuation of land surface deformations was found mainly in mining areas. In 2021, there was a number of collapses of various origins. The paper is a brief report on the ongoing tasks of the Polish Geological Survey in the field of geological hazards and presents events that took place in Poland in 2021.

20

Effectiveness of a mathematical model in simulating nonlinear mechanical behaviour of a seismic isolation system made of polymeric bearings

51%

Falborski T. , Jankowski R.

Czasopismo Techniczne. Budownictwo

|

2016

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tom Y. 113, iss. 3-B

43--54

EN

The present study was focused on determining the effectives of a nonlinear mathematical model in simulating complex mechanical behaviour of a seismic isolation system made of Polymeric Bearings. The proposed mathematical model defines the lateral force as a nonlinear function of the shear displacement and the deformation velocity. The effectiveness of the proposed mathematical model was verified by comparing the seismic response of a 2.30 m high two-storey structure model with the results obtained from the detailed numerical analysis. The results obtained from the numerical investigation using lumped-mass models confirmed that the proposed nonlinear mathematical model can be successfully adopted to simulate the complex mechanical behaviour of the Polymeric Bearings in numerical studies.

PL

W pracy dokonano oceny efektywności modelu matematycznego, opisującego nieliniowe zachowanie prototypu wibroizolacji sejsmicznej w postaci Łożysk Polimerowych. W zaproponowanym modelu matematycznym siła pozioma jest nieliniową funkcją przemieszczenia oraz prędkości. Oceny efektywności modelu matematycznego do opisu nieliniowego zachowania łożysk polimerowych dokonano poprzez porównanie wyników badań eksperymentalnych przeprowadzonych na stole sejsmicznym, w których dwupiętrowy model konstrukcji o całkowitej wysokości 2,30 m poddano różnym obciążeniom dynamicznym, z wynikami analiz numerycznych. Duża zgodność wyników analiz numerycznych z wynikami otrzymanymi z badań eksperymentalnych potwierdziła poprawność zaproponowanego modelu matematycznego do symulacji zachowania Łożysk Polimerowych.