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1 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

1 2014

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Local reinforcement of naturally defected structural lumber

Burawska I., Jachowicz P., Zbieć M., Grześkiewicz M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2014

No. 87

25--34

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).