Item View
Publication: Forest Products Journal
Authors: Galligan W L|Snodgrass D V
Reference ID: 20(9):63-69
Publish Year: 1970
Member Download Price: $0.00
Member Physical Price: $0.00
Title: Machine Stress Rated Lumber: Challenge to Design
Description:
Machine stress rating (MSR) principles of nondestructive testing improve the design potential of lumber through segregation by modulus of elasticity as well as by identification of allowable fiber stress levels. Although significantly more accurate in grading for elasticity than conventional visual grading, use of MSR lumber in conventional housing has been influenced by the paradoxes of stiffness criteria that exist in present wood design. In more ""engineered"" use such as trusses, MSR lumber has been employed extensively because of its ability to identify lumber capable of use at high fiber stress levels. In laminated beam design, where both stiffness and strength are important, acceptance hinges on development of design specifications to accommodate the potential that has been demonstrated in exploratory full- sized beam tests. Progress with advanced lumber grading systems is dependent upon enlightened progress in structural design with lumber.
Machine stress rating (MSR) principles of nondestructive testing improve the design potential of lumber through segregation by modulus of elasticity as well as by identification of allowable fiber stress levels. Although significantly more accurate in grading for elasticity than conventional visual grading, use of MSR lumber in conventional housing has been influenced by the paradoxes of stiffness criteria that exist in present wood design. In more ""engineered"" use such as trusses, MSR lumber has been employed extensively because of its ability to identify lumber capable of use at high fiber stress levels. In laminated beam design, where both stiffness and strength are important, acceptance hinges on development of design specifications to accommodate the potential that has been demonstrated in exploratory full- sized beam tests. Progress with advanced lumber grading systems is dependent upon enlightened progress in structural design with lumber.
You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member