Improved utilization of small-diameter ponderosa pine in glulam timber [report]

Roland Hernandez, David W. Green, David E. Kretschmann, Steven P. Verrill
2005 unpublished
This study involved the evaluation of ponderosa pine glulam made from lumber that was sawn from a small-diameter timber resource. Two different glulam beam depths were evaluated: 8 and 13 laminations. A comprehensive glulam test program was conducted to evaluate edgewise and flatwise bending, shear, and tensile strength. Beam deflection was measured and a variety of glulam MOE values were determined. The calculated design values for various mechanical properties of this new ponderosa pine
more » ... beam combination were compared to the published design values of the L3 glulam combination. Using mechanically graded lumber in the glulam combination resulted in a structural member that efficiently utilized this small-diameter ponderosa pine resource. The calculated design values of this new glulam combination are a significant improvement over the published design values of the all ponderosa pine L3-grade combination that is currently available in the standards.
doi:10.2737/fpl-rp-625 fatcat:qjkxlklhtvgs5pai4x77cgi43e