Wyniki wyszukiwania - BazTech

1

Effects of horizontal ground motion incident angle on the seismic risk assessment of a high-speed railway continuous bridge

Wei Biao, Hu Zhangliang, Zuo Chengjun, Wang Weihao, Jiang Lizhong

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 1

304--323

EN

This study investigates the effects of horizontal ground motion incident angle on a high-speed railway continuous bridge (HSRCB). To that end, incremental dynamic analyses (IDA), seismic vulnerability analyses and seismic risk assessments were conducted on a three-span HSRCB subjected to a set of ground motions under five incidence angles θ (0°–90°). The analysis was developed only from the perspective of PGA and the results showed that the longitudinal waves (θ = 0°) only caused seismic responses in the longitudinal direction, while the waves in other directions, especially in the transverse direction, caused a coupling response both in longitudinal and transverse directions for some components, such as the sliding layer and CA mortar layer. The longitudinal seismic damage of the sliding layer and CA mortar layer under the transverse waves should receive more attention in seismic design since the exceeding probabilities and seismic risk probabilities under various incident angles θ are as high as the calculated value for θ = 0°, and with a variation within 5.95%. The maximum variation of the longitudinal response and probability for track parts was within 10.59% under various incident angles, with a significant difference in the transverse response and probabilities in response to different incident angles. In addition, the responses of bridge structure components were more sensitive to the incident angles in comparison with the track parts. Finally, results indicate that the risk probabilities are at a maximum when the ground motions fall within horizontal orientations of 67.5°–90° at the bridge longitudinal axis.

2

Comparative analysis of the empirical seismic vulnerability of typical structures in multiple intensity zones

Li S. Q., Yu T. L., Chen Y. S.

Archives of Civil Engineering

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2019

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Vol. 65, nr 3

167--183

EN

To study the difference in seismic vulnerability of multiple typical structures in multiple intensity zones, the seismic damage of 7099 buildings of Dujiangyan masonry structure (MS), reinforced concrete structure (RC) and bottom frame seismic wall masonry (BFM) in the 2008 Wenchuan earthquake in China is summarized and analysed. First, a statistical analysis of the data is carried out, the empirical seismic vulnerability matrix and model curves are established by considering the number of storeys, the age and the fortification factors.The vulnerability curves of the cumulative exceeding probability of the empirical seismic damage and the grade of the seismic damage in multiple intensity zones are shown. The mean damage index vulnerability matrix model is proposed and verified using the empirical seismic damage matrix of typical structures.

3

Nadużycia niebezpiecznych chemikaliów. Jak analizować podatność i skąd czerpać wiedzę?

Kalisz D.

Chemik

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2015

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Vol. 69, nr 10

647--648

PL

W Instytucie Chemii Przemysłowej w Warszawie w latach 2013–2015 realizowany był projekt „Ku kulturze bezpieczeństwa chemicznego”, w ramach programu ramowego UE “Prewencja i zwalczanie przestępczości”. W niniejszej publikacji poruszono problem nadużyć niebezpiecznych chemikaliów wraz z podaniem dostępnych źródeł wiedzy – bazując na osiągnięciach tego Projektu.

EN

In 2013–2015 the project „Towards the Chemical Security Culture” being part of the „Prevention and Fight against Crime” Programme was implemented in Industrial Chemistry Research Institute in Warsaw. The issue of misuses of hazardous chemicals is raised in this publication and the sources of knowledge on the basis of the Project achievements are indicated.

4

Structural Vulnerability Analysis for Large-Scale Distributed System based on Multi-layer Topology Model

Xiaohui K., Gang Z., Tang Y., Jin L.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 3b

78-83

EN

Vulnerability analysis of LSDS (Large-Scale distributed systems) has become a growing focus nowadays. A new multi-layer topology model is proposed to describe complex relations between LSDS entities, redundancy mechanism and failure tolerant mechanism in LSDS. Based on this model, a structural vulnerability analysis algorithm based on weight is proposed, which can discover and validate structural vulnerabilities by computing weight of every entity and link with by graph pruning. After that, a new multi-topology model structural vulnerability analysis algorithm is proposed, which can detect the critical entities on different layers of LSDS according to the interdependencies between them. In the end, the efficiency of the algorithms is verified by experiment.

PL

Zaproponowano nowy wielowarstwowy model topologii systemów wielkiej skali rozproszenia LSDS uwzględniający mechanizm błędów i redundancji. Na podstawie tego modelu przeprowadzono analizę wrażliwości systemu.

5

Demonstrators for insensitive tactical rocket motors

Coleno R.

Problemy Techniki Uzbrojenia

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2002

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R. 31, z. 82

7--16

EN

To validate new concepts, CELERG uses generic motors designer, manufactured and tested in a representative way compared to a real tactical missile application. This paper present three types of motors for which decreasing the vulnerability is one of the most important requirements.