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    Wyświetlanie 1-5 z 5
    Tytuł:
    Estimating the safety performance function for urban unsignalized four-legged one-way intersections in Palermo, Italy
    Autorzy:
    Giuffrè, O.
    Granà, A.
    Giuffrè, T.
    Marino, R.
    Marino, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/231391.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    funkcja stanu bezpieczeństwa
    bezpieczeństwo ruchu
    skrzyżowanie miejskie
    rozproszenie nadmierne
    korelacja
    safety performance function
    traffic safety
    urban intersection
    overdispersion
    correlation
    Opis:
    Starting from consideration that urban intersections are sites with promise for safety and operational improvements, the paper describes the steps taken to develop a crash predictive model for estimating the safety performance of urban unsignalized intersections located in Palermo, Italy. The focus is on unsignalized four-legged one-way intersections widespread in Italian downtowns. The sample considered in the study consist of 92 intersections in Palermo, Italy. For the study were collected crashes occurred in the sites during the years 2006-2012, geometric design and functional characteristics and traffic flow. Results showed that data were overdispersed and NB1 distributed. In order to account for the correlation within responses Generalized Estimating Equations (GEE) were used under different working correlation matrices.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 1; 41-54
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combustability of building products versus fire safety
    Autorzy:
    Fangrat, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200506.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    building performance
    buildings fire safety
    building products
    fire properties
    Euroclass
    wydajność budowy
    bezpieczeństwo pożarowe
    wyroby budowlane
    Euroklasa
    Opis:
    The combustion process is described and analysed based on the experimental results in the context of building fire safety. Data are obtained by means of five standard methods: ISO 5657 ignitability test, ISO 5657 cone calorimeter, ISO 9705 room corner test, EN ISO 1716 small calorimeter, and EN ISO 1182 small furnace. Various categories of building products were tested: cellulose based products (particle boards, plywoods), solid wood, floor coverings, concrete, ceramics, insulations (thermal and/or acoustic), boards (wall/ceiling), mortars, adhesives, and thin coatings. The studied products exhibited very different fire properties from non-combustible to easily combustible. In order to more effectively differentiate non-combustibles and combustibles within building products, the modified heat of combustion was calculated using all test results according to EN ISO 1716 and EN ISO 1182. The revision of criteria for Euro class A1 and A2 is proposed to obtain more realistic reaction-to-fire evaluation. In conclusion, it is advised to use single limit for heat of combustion for A1 and A2 Euro class. The proposed approach for modified heat of combustion is a convenient tool for the fast and cost-effective initial test method for non-combustibility evaluation and seems to be the proper method for distinguishing between non-combustibles and combustibles within building products. It is a better reflection of the real physical process of combustion than the current one. The third A1 criterion is questionable, regarding time to auto-ignition in EN ISO 1182 cylindrical furnace. The measurement for gross heat of combustion by EN ISO 1716 method is proposed for all Euro classes of building products with different limit values.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 709-717
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the conditions for the exhaustion of the stability margin in the rail track of freight cars with three-piece bogies
    Autorzy:
    Domin, Yurii V.
    Domin, Rostysla Yu.
    Cherniak, Ganna Yu.
    Nozhenko, Volodymyr S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1833607.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    freight cars
    derailment
    traffic safety
    dynamic performance
    computer simulation
    wagony towarowe
    wykolejenie
    bezpieczeństwo na drodze
    wydajność dynamiczna
    symulacja komputerowa
    Opis:
    The research on improvement of methodical approaches to definition of the probable reasons of infringement of conditions of stability of freight cars from derailment is carried out. Using a basic computer model of the dynamics of a freight car, the influence of the characteristics of the technical condition of their running gear and track on the indicators of empty cars stability from derailment was studied through the computational experiment. The article presents the main statements of the research methodology, which provides the analysis of probable causes of derailment of freight cars by conducting a series of numerical experiments with logging the progress of calculations and saving the results. Factor analysis was used to interpret the calculated data with an assessment of each of the factors influence or their combination on the probability of derailment. The developed procedure of the simulation experiment provides a step-by-step study of the freight cars derailment conditions, including factors structuring and ranking, development of experimental plan, calculating coefficients of wheel pairs resistance to derailment from rails, provided that the wheel flange rolls onto the rail head, and determining the degree of influence of relevant factors on the dynamic stability of cars from derailment. A comparative analysis of the stability of cars in rail tracks was performed using the introduced concept of the combined coefficient of stability of wheel pairs against derailment. Determining the probable causes of car derailment is based on scanning the parameter field. The results of the parametric study revealed the degree of influence on the freight cars stability of running gear technical condition characteristics. In particular, it is determined that the most dangerous in terms of stability loss of empty cars in the track is the exceeding of the wedges of the vibration dampers.
    Źródło:
    Archives of Transport; 2021, 57, 1; 119-129
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The philosophy of fire safety engineering in the shaping of civil engineering development
    Autorzy:
    Węgrzyński, W.
    Sulik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/202026.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fire safety engineering
    fire protection engineering
    fire protection
    performance based design
    prescriptive codes
    inżynieria bezpieczeństwa pożarowego
    inżynieria ochrony przeciwpożarowej
    ochrona przeciwpożarowa
    projektowanie oparte na wydajności
    Opis:
    This paper presents modern application of fire safety engineering (FSE) in the shaping of civil engineering development. Presented scientific achievements of FSE become tools used in typical modern engineering workflow. Experience gained through successful implementations of these solutions is then further crafted into prescriptive laws that shape future fire safety. This diffusion of knowledge is limited by law requirements themselves, technical limitations, and yet unresolved challenges that are still being worked on by the researchers in this field. This paper aims to present the achievements of the FSE discipline that may and should be used by civil engineers and other participants of the building process. Explanations given for the choices of fire safety engineers allow a better understanding of their gravity by representatives of other engineering branches. That way it is possible to build empathy between different engineering disciplines, which may significantly improve both the building design process and safety of the buildings itself. The chosen framework of this paper is Appendix A to EU Construction Products Regulation defining basic goals for a fire safe building, with a possible application of FSE given for each of these goals. The current framework of performance-based FSE is presented in relation to the Polish legal system, with recommendations on how to improve both FSE and civil engineering in the future.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 719-730
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of cross-section on roads through built-up areas
    Autorzy:
    Kieć, M.
    Tracz, M.
    Gaca, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/230190.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    model symulacji
    zmiana
    sieć dróg
    bezpieczeństwo drogowe
    przekrój
    wydajność ruchu
    pomiary skuteczności
    opóźnienia
    prędkości jazdy
    pluton
    simulation model
    modification
    road network
    road safety
    cross-section
    traffic performance
    measurements of effectiveness
    delay
    travel speed
    platoon
    Opis:
    The research into the use of less costly modifications of road links and networks, and changes in the service of road surroundings aimed at ensuring an improvement of through traffic performance in suburban areas, and on roads passing through built-up areas as small localities, with application of simulation model, is presented in this paper. From among possible designs, the authors investigated and presented the effectiveness of two, i.e. implementation of an additional multifunctional median lane in the road cross-section, and construction of service roads with different locations of intersections (end or middle of the road section). The analysis is focused on the impact of such changes on traffic performance and road safety. The authors analysed travel speed, delay and share of platoon traffic on a uniform sections of the road for different types of road surroundings service. The study presents the results of analyses of road network before and after modification, and the assessment of: impact of access points density and level of their use on road traffic performance, impact of driving through road sections in built-up area on building platoon traffic, impact of change in the cross-section type on traffic performance.
    Źródło:
    Archives of Civil Engineering; 2012, 58, 3; 243-257
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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