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Supporting Theory on Prestressed Wood Members
Design of Test Beams and Special Experimental Equipment
Material and Fabrication
3 other sections not shown
19 laminations approximately beam pair beam showing beams were fabricated Bechtel and Norris boards calculated calibration camber center line chuck compression failures compression parallel compressive stress creep in wood Detailed sketch developed ducts end-bearing plates experimental factor of safety Failures of beam figure 17 Forest Products Laboratory Glued Laminated Wood inches induced stresses inertia initial prestressing kiln knots laminated beams listed in column load carried load cells load points longitudinal stress distribution lumber Madison maximum crushing strength modulus of elasticity pair of beams percent pounds prestressed beams prestressed concrete prestressed wood beam prestressed wood member prestressing force prestressing steel proportional limit reliable resawing shear shown in figure Simplified longitudinal stress specific gravity steel strands strain gages strength is less strength properties strength-reducing characteristics stress level tensile stress tension failure tension2 minor compression Test Beams theory of prestressing ultimate compressive strength ultimate load ultimate tensile strength unused compressive force