ANALYSIS OF RHEOLOGICAL AND THERMO-HYGRO-MECHANICAL BEHAVIOUR OF STRESS-LAMINATED TIMBER BRIDGE DECK IN VARIABLE ENVIRONMENTAL CONDITIONS

Macarena Figueroa, Cecilia Bustos, Peter Dechent, Laura reyes, Alain Cloutier, Mario Giuliano

Abstract


Wood material has a thermo-hygromechanical behaviour because its deformation dependson the combined action of temperature, relative humidity and mechanical load variations. Stresslaminatedtimber bridge deck show a reduction of stress in the tension bars mainly due to therelaxation and shrinkage of wood, increasing with moisture content and temperature changes withinthe wood. e aim of this research was to study the rheological behavior of stress-laminated timberbridge deck samples under temperature and relative humidity variations. A total of 16 samples werepreviously treated with four types of preservative treatments, which were subjected to four cycles oftemperature and relative humidity in a climate chamber. Wood samples deformation and stress inthe steel bars were measured. e results showed a signi cant stress reduction in the steel bar during the summer season and a signi cant increase during the winter season. e results also showedsigni cant di erences between the deformations of control samples compared to the preservativetreated samples for each cycle. However, for interlaminar stress, di erences were signi cant only inthe winter season. Moreover, for both deformation and interlaminar stress, no signi cant di erencesbetween cycles three and four were found. erefore there is no evidence of thermo-hygromechanicalcreep or relaxation of wood in the conditions considered in this study.

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