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EN
Atmospheric temperature and directed solar radiation have a significant effect on the temperature field of high-speed railway (HSR) concrete bridge and ballastless track structure. However, temperature actions are random process of which distribution laws are difficult to explore, and existing statistical methods for structure temperature analysis are still not precise. So far, there are few researches for annual temperature spectra and design codes for bridge–track system. Based on the one-year observation data, this paper investigated the temperature actions for Chinese HSR bridge–track structure. By utilizing reliability high moment theory, a statistical method which could built virtual distribution was put forward. Based on the renewed study, the effects of waterproof for deck were taken into consideration, a temperature action model was proposed which is suitable for both bridge and track structure. In addition, for track structure, the previous temperature load models were modified. Apart from that, by proposing the concepts of temperature uniform and fluctuant spectra, the research evaluated service performance of structure. Finally, the distribution regularities of uniform temperature spectra were fitted by Fourier series, and the relationship between structural and atmospheric uniform temperature was established (formula (25)). As a result, according to 50 years recorded atmospheric temperature data, the prediction model of the structure extreme temperature was suggested, and by taking the recurrence interval of 100, 150 and 300 years, the extreme temperatures of the system are 52.23, 54.34 and 57.77 °C.
2
Content available remote Metody oceny stanu betonu w konstrukcji po pożarze
PL
Artykuł stanowi opracowany na podstawie literatury przegląd metod stosowanych w celu oceny wpływu działania wysokiej temperatury na beton w konstrukcji. Przedstawiono w nim techniki oceny uszkodzeń pożarowych betonu możliwych do stosowania in situ oraz metody laboratoryjne. Omówiono podstawowe założenia opisanych metod.
EN
This paper reviews the current state of the art in the use of diagnostic methods to assess the impact of high temperature on structural concrete. In situ techniques and laboratory methods for the assessment of fire damaged concrete are described. The basic assumptions of those methods are discussed.
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