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The design strength 5th percentile of the beams obtained by monte carlo simulations is reported and found to range from 32 3 mpa to 97 2 mpa depending on the quality of the veneers used and the beam size.
Laminated veneer lumber tensile strength. For latewood pinus sylvertris l krauss et al. Tensile strength tests were carried out on various glued laminated wood gl and laminated veneer lumber lvl with butt joints bj and size effects of the length of specimens were examined experimentally. Wood material science engineering. This paper reports the results for a series of perpendicular to grain tension tests that were performed at the.
Laminated strand lumber lsl and laminated veneer lumber lvl were thermally modified as a post treatment at 140 c 150 c 160 c 170 c and 180 c. The tension modulus of elasticity moe of lsl. 2007 prepared laminated veneer lumber lvl from thermally modified yellow poplar scots pine jack pine and aspen lamellas bonded together. Shear strength of most samples was reduced 30 50 but scots and jack pine had only moderate decreases of 5 and 11 respectively.
Tensile strength of thermally modified laminated strand lumber and laminated veneer lumber. 42 reported a ratio of about 2 between the wood and cell walls tensile strengths. It is comparable in strength to solid timber concrete and steel and is manufactured by bonding together rotary peeled or sliced thin wood veneers under heat and pressure. Laminated veneer lumber lvl is a high strength engineered wood product used primarily for structural applications.
The cell walls tensile strength is in the order of 200 400 mpa i e. This value is comparable with the three layer combinations herein. The tension modulus of elasticity moe of lsl was not significantly impacted by the treatments with the 180 c treatment group exhibiting the highest tension moe 11 8 gpa. Cross banded laminated veneer lumber lvl c have been introduced into the market specifically to im prove the perpendicular to grain properties of normal laminated veneer lumber lvl.
In addition laminating effects which improve strength properties were also examined on the gl. Cited keywords engineered wood modified wood.
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