Local reinforcement of naturally defected structural lumber

• Autorzy: Burawska, I. , Jachowicz, P. , Zbieć, M. , Grześkiewicz, M.
• Języki publikacji: EN

Abstrakty

EN

Local reinforcement of naturally defected structural lumber. Paper presents local reinforcement of structural lumber, reducing negative impact of natural wood defects (especially knots), on strength parameters. Local repair engineering allows usage of structural members of decreased strength caused by natural defects, which was previously impossible because of legal regulations and risk of collapse. Strengthening procedures may also be used in existing, especially overloaded structures, renewing their initial strength and load capacity. Effectiveness of local reinforcement was determined by analysis of load capacity and deformation. Glass and carbon fibre composites were used as reinforcing materials. Various shapes of local reinforcement were tested, while maintaining constant length of strengthening in the tension zone of bent element. All tested types of reinforcement showed statistically significant increase in MOR and ultimate force. The highest strength gain was reached with X-shape reinforcement. Statistically significant MOE increase was obtained for X-shape glass fabric reinforcement (315g/m2 and 385g/m2 basis weight).

Słowa kluczowe

PL

drewno; FRP; konstrukcje drewniane

EN

timber; knots; bending; reinforcement; FRPs

• Czasopismo: Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
• Rocznik: 2014
• Tom: No. 87
• Strony: 25--34
• Opis fizyczny: Bibliogr. 9 poz.

Twórcy

autor

Burawska, I.

• Szkoła Główna Gospodarstwa Wiejskiego w Warszawie; Wydział Technologii Drewna

autor

Jachowicz, P.

• Szkoła Główna Gospodarstwa Wiejskiego w Warszawie; Wydział Technologii Drewna

autor

Zbieć, M.

• Szkoła Główna Gospodarstwa Wiejskiego w Warszawie; Wydział Technologii Drewna

autor

Grześkiewicz, M.

• Szkoła Główna Gospodarstwa Wiejskiego w Warszawie; Wydział Technologii Drewna

Bibliografia

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• 4. BURAWSKA I., ZBIEĆ M., BEER P., 2013. Effectiveness of local and whole length reinforcement of wooden beams, In: Młodzi dla Techniki 2013, 6th Oct. 2013, Płock, Poland, Publisher Warsaw Technical University.
• 5. BURAWSKA I.. ZBIEĆ M., KALICIŃSKI J., BEER P., 2013. Technical simulation of knots in structural wood, Ann. WULS-SGGW, Forestry and Wood Technology 81.
• 6. CAOLIN A., 2003. Carbon Fibers Reinforced Polymers for Strengthening of Structural Elements. Lulea University of Technology, PhD thesis.
• 7. GUINDOS P., GUAITA M., 2012. A three- dimensional wood material model to simulate the behavior of wood with any type of knot at macro-scale. Wood Science Technology 47.
• 8. NOWAK T. 2007. Analiza pracy statycznej zginanych belek drewnianych wzmacnianych przy użyciu CFRP [Analysis of static work of bending timber beams reinforced with CFRP] (in polish), Politechnika Wrocławska, PhD thesis.
• 9. TRIANTAFILLOU T. C., 1997. Shear reinforcement of wood using FRP materials.Journal of Materials in Civil Engineering, Vol. 9.