Probabilistic modeling of timber members

• Autorzy: Domański T.
• Języki publikacji: EN

Abstrakty

EN

Safety assessments of structures built in the past require taking into consideration many different parameters. These parameters are mostly random and describe materials characteristics, actions and history of actions. The load bearing capacity of timber structures decreases with time. It depends on the type of load and timber. Strength reduction effects, referred to as creep-rupture effects, due to long term loading at high stress ratio levels are known for many materials. Timber materials are highly affected by this reduction in strength with duration of load. Characteristic values of load duration and load duration factors will be calibrated by means of using probabilistic methods. Three damage accumulation models will be considered, that is Gerhards model, Barret & Foschi's and Foshi & Yao's model. The reliability will be estimated by means of using representative short- and long-term limit states. Time variant reliability aspects will be taken into account using a simple representative limit state with time variant strength and simulation of whole life time load processes. Non-destructive laboratory tests of timber strength will be applied to update the level of safety. The Bayes theory and methodology will be applied to calculate the aposteriori level of timber members parameters and safety.

Słowa kluczowe

EN

timber construction; construction member; creep; safety factor; reliability; modelling

PL

konstrukcja drewniana; element konstrukcyjny; pełzanie; współczynnik bezpieczeństwa; modelowanie; niezawodność

• Wydawca: Oficyna Wydawnicza Politechniki Rzeszowskiej
• Czasopismo: Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska
• Rocznik: 2009
• Tom: z. 53 [265]
• Strony: 57--63
• Opis fizyczny: Bibliogr. 13 poz.

Twórcy

autor

Domański T.

• Cracow University of Technology, Kraków, Poland

Bibliografia

• [1] EN 1995 Eurocode 5 -Design of timber structures Part 1.1 General Common Rules
• [2] Kohler J., Sorensen J., Faber M., Probabilistic modeling of timber structures. Structural Safety 29 (2007) 255-267.
• [3] Sorensen J., Svensson S., Stang B., Reliability-based calibration of load duration factors for timber structures. Structural Safety 27 (2005) 153-169
• [4] Faber M., Kohler J., Sorensen J., Probabilistic modeling of graded timber material properties. Structural Safety 26 (2004) 295-309
• [5] Rosowsky D., Bulleit M., Load duration effect in wood members and connections: order statistics and critical loads. Structural Safety 24(2002) 347-362
• [6] COST Action E 24, Reliability of timber structures. Several meetings and Publication: www.km.fgg-uni-lj.si/coste24/coste24.htm; 2005
• [7] Gerhards CC. Time related effects on wood strength: a linear cumulative damage theory. Wood Sci 1979; 11(3); 139-44
• [8] Barret J., D, Foshi R., O., Duration of load and probability of failure in wood. Part 1; modelling creep rupture. Can J. Civil Eng., 1978; 5(40); 505-14.
• [9] Ellingwood B., R., Acceptable risk bases for design of structures. Prog. Engn Mater: 2001
• [10] Foschi R., O., Folz B., R., Yao F., Z., Reliability-based design of wood structures. Structural research series. Rep. no 34. Dep. Of Civil Eng., Univ. of British Columbia. Vancuver, Canada 1989.
• [11] Joint Committee of Structural Safety. Probabilistic Model Code. Internet Publication: www.jcss.ethz.ch; 2001
• [12] Svensson S., Thelandersson S., Aspects on reliability calibration of safety factors for timber structures. Holz als Roh-und Werkstoff 61 (2003) 336-341.
• [13] EN 1990: Eurocode -Basis of Structural Design.