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Torsion test was evaluated as a method to determine the shear strength of full-size structural composite lumber.Laminated veneer lumber (LVL),parallel strand lumber (PSL)and laminated strand lumber (LSL) were tested using torsion and shear block tests.Shear strength of structural composite lumber based on torsion test was much lower than the shear strength obtained from the shear block test.LSL exhibited greater orthotropic behavior than LVL and PSL.