Development of mathematical model proposed for prediction of final deformation in bending of timber beams

摘要

This study is devoted to the development of the mathematical model applicable for prediction ofrnfinal deformation of timber beams at the end of service life. The model presented in a new editionrnis based on the known Burger body concept. This is continued study by authors and deals withrndefining the limitations of numerical values for model’s constants representing the influencingrnfactors mentioned above with purpose to assess the fitness for use of model in design. Numericalrnvalues of strain obtained by treatment of theoretical model proposed are compared with therncorresponding estimates from experiments performed in longterm (approximately 1.5 years) staticrnloading of softwood (European Redwood - Pinus Sylvestris) beams in a four point bending underrnnatural environmental conditions at the Baltic Sea region. It has been proved that the modelrnproposed may be acknowledged as appropriate for prediction of deformations in static bending.