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Performance of Glulam ColumnsCompleted

Project leaders: Lam, Frank


In this study, the impact of a possible increase of short column parallel-to-grain compressive strength
of Douglas fir 16c-E glulam members on the performance of intermediate columns has been studied.
Full scale intermediate column tests and numerical analyses have been performed. The results
indicate the modulus of elasticity (MOE) values for 16c-E glulam columns in CSA code seem to be
slightly conservative. The measured MOE of the glulam specimens was higher than the code
specified value even though the tested glulam was made with laminate having lower MOE than the
requirement of CSA O122. Using experimental based parameters as input to the Cubic Rankine-
Gordon (CRG) curve, increase of compression design stress can lead to a small overestimate of 2.9%
in column capacity when compared to Euler buckling in the slenderness range of 24 to 32. The
empirical parameter, N, in the CRG curve can be adjusted from 35 to 33 to correct the overestimation.
Considering current code specified MOE values (E =12,400 MPa and E05 =10,788 MPa), an increase
in short column compression parallel to grain specified strength of DF 16c-E from 30.2 MPa to 31.0
MPa would still lead to safe glulam column design.

Start date: 2011-05-30 End date: 2012-05-30



For more information on this project, please contact:

Lam, Frank
University of British Columbia
Email: frank.lam@ubc.ca
Telephone: (604) 822-6526
Fax: (604) 822-9159
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