Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Calculating apparent reliability of wood scaffold planks
Abstract Current safety requirements of the American National Standards Institute (ANSI A10.8) for wood scaffold planks are rooted in a history of generally good performance. The requirements are prescriptive in nature, making the standard easy to use. However, in its current form the standard prescribes only maximum allowable spans and limits its scope to three plank sizes and three load conditions. It does not specify what constitutes acceptable performance in solid-sawn scaffold planks. Thus, the requirements cannot be applied with uniform reliability to different plank systems. At the request of the ANSI A10.8 Subcommittee, an ad hoc advisory group from the wood industry was formed to address this problem. This paper relates published requirements for wood scaffold planks in codes and standards to the allowable bending stresses published by lumber grading agencies based on a set of assumptions recommended by the ad hoc group. A methodology is proposed, based on requiring equivalent structural reliability, for designing alternative wood-based scaffold planks. It is anticipated that this paper will be useful to producers and users of wood scaffold plank in its illustration of the sensitivity of both performance and reliability estimates to assumed material variability and distribution type. It is hoped that this report will generate discussion, both on the ANSI requirements themselves and on the best methodology to translate those requirements into measures of safety.
Calculating apparent reliability of wood scaffold planks
Abstract Current safety requirements of the American National Standards Institute (ANSI A10.8) for wood scaffold planks are rooted in a history of generally good performance. The requirements are prescriptive in nature, making the standard easy to use. However, in its current form the standard prescribes only maximum allowable spans and limits its scope to three plank sizes and three load conditions. It does not specify what constitutes acceptable performance in solid-sawn scaffold planks. Thus, the requirements cannot be applied with uniform reliability to different plank systems. At the request of the ANSI A10.8 Subcommittee, an ad hoc advisory group from the wood industry was formed to address this problem. This paper relates published requirements for wood scaffold planks in codes and standards to the allowable bending stresses published by lumber grading agencies based on a set of assumptions recommended by the ad hoc group. A methodology is proposed, based on requiring equivalent structural reliability, for designing alternative wood-based scaffold planks. It is anticipated that this paper will be useful to producers and users of wood scaffold plank in its illustration of the sensitivity of both performance and reliability estimates to assumed material variability and distribution type. It is hoped that this report will generate discussion, both on the ANSI requirements themselves and on the best methodology to translate those requirements into measures of safety.
Calculating apparent reliability of wood scaffold planks
Gromala, David S. (Autor:in)
Structural Safety ; 2 ; 47-57
15.01.1984
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch