Type of Document Master's Thesis Author Yadama, Vikram URN etd-12302008-063816 Title Experimental investigation of a novel finite element model for Southern pine glulam beams Degree Master of Science Department Wood Science and Forest Products Advisory Committee
Advisor Name Title Loferski, Joseph R. Committee Chair Holzer, Siegfried M. Committee Member McLain, Thomas E. Committee Member Keywords
- Laminated wood
Date of Defense 1990-06-05 Availability restricted AbstractGlued-laminated wood (Glulam) is a versatile material manufactured by gluing two or more
layers of wood together with the grain of all laminae running parallel to each other. Glulam beams of many sizes, shapes, and thicknesses can be made. Innovative load-carrying structures such as lattice domes, bridges, and towers can be built using glulam members.
But, since wood is a highly variable and anisotropic material it is often difficult to accurately model the response of wood components in large structures to applied loads. Advanced computer techniques such as finite element analysis are being developed to more accurately model structure response.
The objective of this study was to evaluate the applicability of the isoparametric beam finite
element to model the elastic response of straight and curved glulam beams subjected to three load
conditions. Four straight and three curved southern pine glued-laminated beams were subjected
to bending about their major axis, bending about their minor axis, and combined bending and
compression. Strains were measured at various locations using clip-on electrical transducers; and, deflections were measured at three locations along the length. Transverse isotropy and global
modulus of elasticity were assumed ,to determine experimentally beam material properties: longitudinal modulus of elasticity and shear modulus. The analysis was performed by using the finite element program ABAQUS.
The experimental and the analytical strain and deflection values of giu1am beams in bending
about the major and the minor axes agreed well for most cases. Differences of less than 100/0 between experimental measurements and analytical predictions were found at all locations through the depth of the beams except in the vicinity of the neutral axis. The differences between the measured and the predicted strain and deflections for beams tested in combined bending and axial compression ranged mostly between 0 % and 40 % •
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