Abstract

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Title:: Experiment on Effect of Humidity on Dowel Bearing Strength of Glued Laminated Timber

Author(s):: MA Gui-jin; XU De-liang; LU Wei-dong; LIU Wei-qing; SONG Jia-cheng; College of Civil Engineering, Nanjing Tech University

Keywords:: glued laminated timber; humidity; failure mode; dowel; bearing strength; initial stiffness

Abstract:: In order to study the effect of humidity on dowel bearing strength of glued laminated timber, 45 specimens of glued laminated timber including three kinds of humidity (50%, 70% and 90%) and three kinds of grain direction (longitudinal grain, diagonals grain, horizontal grain) were chosen in dowel bearing strength test, and the comparison between experimental results and the calculated results according to international standard formula was given. The results show that failure mode is related to the grain direction of glued laminated timber. With the linear growth of relative humidity, the dowel bearing strength and initial stiffness exhibit the trend of nonlinear decline. The calculated values of dowel bearing strength according to the existing standard formula are in poor agreement with the test values, so the existing standard formula needs to be optimized furtherly.