Identyfikatory
Warianty tytułu
Wpływ zmniejszenia odporności ogniowej drewna na wytrzymałość budynków
Języki publikacji
Abstrakty
Present research was dedicated to investigation of strength of timber structures in fire conditions. Two kinds of timber specimens were used: oak and pine. Investigation included the following static test: tensile strength, compressive strength along fibres, compressive strength across fibres and bending strength. Specimens were tested under the following temperatures: 50°C, 100°C, 150°C, 200°C and 230°C. The result shows that pine specimens have better properties over entire temperature range in case of tensile and bending strength tests. Also for these strength types oak specimens shows a higher strength reduction rate than pine specimens. Whereas oak specimens have better properties over entire temperature ranges in case of compressive strength across fibres. Based on statistical analysis the linear expression for strength reduction coefficient was proposed.
W badaniach zastosowano testy statyczne badające następujące cechy: odporność na rozciąganie, wytrzymałość na ściskanie zarówno wzdłuż, jak i w poprzek włókien, jak również odporność na zginanie. Próbki poddano testom w temperaturach 50 °C , 100 °C, 150 °C, 200 °C oraz 230 °C. Wyniki pokazują, że próbki sosny posiadają lepsze właściwości odporności na rozciągania i zginanie we wszystkich temperaturach. W badaniach powyższych odporności próbki dębu wykazują większe zmniejszenie stopnia odporności aniżeli próbki sosny. Jednakże próbki dębu mają lepsze cechy odporności na ściskanie w poprzek włókien we wszystkich temperaturach. Opierając się na analizie statystycznej zaproponowano liniowe wyrażenie dla współczynnika zmniejszenia odporności.
Słowa kluczowe
Wydawca
Rocznik
Tom
Strony
5--25
Opis fizyczny
Bibliogr. 19 poz., rys., tab.
Twórcy
autor
- The Main School of Fire Service (MSFS) in Warsaw, Poland
autor
- Department of Labour Safety and Fire Protection, Vilnius Gediminas Technical University, Lithuania
Bibliografia
- 1. Bednarek Z.: Determination of the temperature of uncovered steel constructions using numerical methods. Statyba 1996, 4(8): 6–10.
- 2. Bednarek Z.; Kaliszuk-Wietecka A.; Wiśniewski Т.: Research on the influence of fire protection impregnation carried out by the vacuum -and-pressure method on wood dynamic strength. Building Review (Przegląd Budowlany) 2002, 10: 12−14 (in Polish).
- 3. Bednarek Z., Kaliszuk-Wietecka A.: Scientific research on the influence of fireproof wood preservation carried out by the vacuum-pressure method on strength of wood in normal and elevated temperatures. Proceedings of the 8th International Conference Modern Building Materials, Structures and Techniques, Vilnius 2004, 19-21 May, p. 963−967.
- 4. Bednarek Z., Ogrodnik P.: Testing steel-concrete bond in fire conditions. Proceedings of the 9th International Conference Modern Building Materials. Structures and Techniques, Vilnius 2007, 16-18 May, p. 1152−1158.
- 5. Dębowska A.: Problems of wood steel constructions in fire. Polytechnic Opole. (in Polish) 2004.
- 6. ENV 1995-1-2 Eurocode 5: Design of timber structures. – Part 1-2: General rules Structural fire design. Brussels.
- 7. Gerhards Ch. C.: Effect of moisture content and temperature on the mechanical properties of wood: An analysis of imediate effects. Wood and Fiber 1982, 14 (1): 4−36.
- 8. Glos P., Henrici D.: Stability of wood in high temperatures. Wood and Raw Materials 1991, p. 417−422.
- 9. Gribniak V., Bacinskas D, Kaklauskas G.: Numerical simulation strategy of reinforced concrete tunnel bearing members in fire. The Baltic Journal of Road and Bridge Engineering 2006, 1 (1), p. 5−9.
- 10. Holm C.: A survey of the goals and results of fire endurance investigations especially from the viewpoint of glued laminated structures. Symposium in Tbilisi. Fire Resistance of Wood Structures, Tbilisi 1980.
- 11. Huntierova, Z.: Analysis of the burning behavior of wood and timber considering the use of fire protection layers. Munich: Graefelfing publishing house. 1995 (in German).
- 12. Kordina K., Meyer-Ottens C.: Handbook of wood fire safety. Munich: DGfH 1983 (in German).
- 13. Kordina K., Meyer-Ottens C., Scheer C.: Handbook of wood fire safety. Munich: Ernst and Son 1994 (in German).
- 14. Krakovský A.; Kral Š.: The influence of thermo mechanical loading on behavior of spruce wood. Technical University in Zvolen 2004 (in Polish).
- 15. Lache M.: A survey of the burning rate of solid wood and the fire resistance of wooden ceiling boards exposed to bending. Munich 1992 (in German).
- 16. Law K. N., Koran Z.:. Torsional-shear stress of wood at various temperatures. Wood Science and Technology 1981, 15 (3), p. 227−235.
- 17. Nyman C.: The effect of temperature and moisture on the strength of wood and glue joists. Technical Research Centre of Finland. Report Forest Products Lab. 1980, nr 6.
- 18. Schaffer E.: State of structural timber fire endurance. Wood and Fiber 1997, 9 (2), p. 145−170.
- 19. Tran H. C., White R. H.: Burning rate of solid wood measured in a heat release rate colorimeter. Fire and Materials 1992, 16, p. 197−206.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-860e0d28-ca02-48e1-95a2-09bfabbda508