Material Variability and Repetitive Member Factors for the Allowable Properties of Engineered Wood Products
نویسندگان
چکیده
It has been argued that repetitive member allowable property adjustments should be larger for high-variability materials than for low-variability materials. We report analytic calculations and simulations that suggest that the order of such adjustments should be reversed, that is, given the manner in which allowable properties are currently calculated, as the coefficient of variation of the strength distribution of individual elements increases, the upward repetitive member adjustments (if any) of assemblies constructed from these elements should decrease.
منابع مشابه
Sources of Confusion in the Determination of ASTM Repetitive Member Factors for the Allowable Properties of Wood Products
Confusion in the literature about the definition and calculation of repetitive member factors is identified. This confusion casts some doubt on the validity of the 1.15 repetitive member factor permitted in ASTM standards D245 and D1990. DOI: 10.1061/(ASCE)ST .1943-541X.0000413. © 2012 American Society of Civil Engineers. CE Database subject headings: Wood; Material properties; Reliability. Aut...
متن کاملVariability in wood properties of promising willow clones
The objective of the article is to investigate the variability in growth and wood properties of the willow clones. The growth and wood traits of four year old 21 clones willow clones were investigated. Analysis of variance showed that willow clones differed significantly for all the studied growth and wood traits. Among the growth parameters the maximum heritability value was shown by height wh...
متن کاملPrediction of Engineered Cementitious Composite Material Properties Using Artificial Neural Network
Cement-based composite materials like Engineered Cementitious Composites (ECCs) are applicable in the strengthening of structures because of the high tensile strength and strain. Proper mix proportion, which has the best mechanical properties, is so essential in ECC design material to use in structural components. In this paper, after finding the best mix proportion based on uniaxial tensile st...
متن کاملA novel method for manufacturing of wood flour/PP composites with better fire retardancy and mechanical properties
This study was conducted to investigate the effects of applying methods andamount of ammonium polyphosphate (0, 2 and 4 wt%) on fire retardancy andmechanical properties of wood flour/polypropylene composites. The resultsshowed that addition of fire retardant improved the mechanical properties such astensile and flexural strengths and fire retardancy of composites. But by increasingof fire retar...
متن کامل