Analytical Approach to Predict Pre–Camber Deflection of the Pre-stressed Glulam Beams
Abstract: A new approach to
reinforce glulam timber beams using compressed wood (CW) has been developed by
the Author. The compressed wood blocks are inserted into pre-cut holes on the
top of glulam beams to produce pre-camber and to generate initial tensile and
compressive stresses on the top and on the bottom extreme fiber of the glulam
beam, respectively. A simple analytical approach has been developed to predict
pre-camber deflections of the beams reinforced with three CW blocks. Assuming
that moisture-dependent expansion of the CW block creates an interactive linear
pressure between the glulam beam and the CW block, this would generate a pair
of eccentric force away from the neutral axis of the beam. It is shown that the
pre-camber deflection predicted at midspan of the short beams with various
reinforcing arrangements give good agreement with the measured pre-camber from
previous experimental results.
Author: Anshari B.
Journal Code: jptsipilgg150010
