Abstract: Simulations were conducted to compare the outcomes of post-frame designs using allowable stress design(ASD) and load resistance factor design (LRFD) methods. An LRFD procedure, utilizing readily available design tools,such as Purdue Plane Structures Analyzer (PPSA4) and Excel, was used to design 36 different post-frames with varyingwidth, length, and height. The same 36 frames were also designed by ASD procedures and the results from the two designmethods were compared. Both sets of designs utilized the diaphragm strength capability of the steel sheathing. The effectof designing with three post types was also examined (glued-laminated, solid-sawn, and nail-laminated). The similarity ofASD and LRFD post design results was found to be dependent upon building geometry, load ratios and combinations, andpost type. Combined stress index (CSI) values for wall posts for ASD and LRFD were equivalent for glued-laminatedposts and within 6% for solid-sawn and nail-laminated posts for the full dead plus wind load case. Differences in CSIvaluesfor sidewall posts for full wind and reduced snow load were highly dependent on building geometry and snow towind load ratios. Differences between ASD and LRFD outcomes generally increased as building span, building height,and vertical load magnitude increased. In LRFD, full snow and reduced wind was the controlling load combination formost cases, whereas in ASD half snow and full wind was the controlling load for most cases.
Publication Year: 1997
Publication Date: 1997-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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