2012 ASD/LRFD Manual for Engineered Wood Construction
2012 ASD/LRFD Manual for Engineered Wood Construction
2012 ASD/LRFD Manual for Engineered Wood Construction
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2 M1: GENERAL REQUIREMENTS FOR STRUCTURAL DESIGNM1.1 Products Covered in This <strong>Manual</strong>This <strong>Manual</strong> was developed with the intention of coveringall structural applications of wood-based productsand their connections that meet the requirements of thereferenced standards. The <strong>Manual</strong> is a dual <strong>for</strong>mat documentincorporating design provisions <strong>for</strong> both allowablestress design (<strong>ASD</strong>) and load and resistance factor design(<strong>LRFD</strong>). Design in<strong>for</strong>mation is available <strong>for</strong> the followinglist of products. Each product chapter contains in<strong>for</strong>mation<strong>for</strong> use with this <strong>Manual</strong> and the National DesignSpecification® (NDS®) <strong>for</strong> <strong>Wood</strong> <strong>Construction</strong>. Chaptersare organized to parallel the chapter <strong>for</strong>mat of the NDS.• Sawn Lumber Chapter 4• Structural Glued Laminated Timber Chapter 5• Round Timber Poles and Piles Chapter 6• Prefabricated <strong>Wood</strong> I-Joists Chapter 7• Structural Composite Lumber Chapter 8• <strong>Wood</strong> Structural Panels Chapter 9• Mechanical Connections Chapter 10• Dowel-Type Fasteners Chapter 11• Split Ring and Shear Plate Connectors Chapter 12• Timber Rivets Chapter 13• Shear Walls and Diaphragms Chapter 14An additional Standard, titled Special Design Provisions<strong>for</strong> Wind and Seismic (SDPWS), has been developedto cover materials, design, and construction of woodmembers, fasteners, and assemblies to resist wind andseismic <strong>for</strong>ces.M1.2 General RequirementsThis <strong>Manual</strong> is organized as a multi-part package <strong>for</strong>maximum flexibility <strong>for</strong> the design engineer. Included inthis package are:• NDS and Commentary;• NDS Supplement: Design Values <strong>for</strong> <strong>Wood</strong><strong>Construction</strong>,• Special Design Provisions <strong>for</strong> Wind and Seismic(SDPWS) and Commentary,• Structural <strong>Wood</strong> Design Solved Example Problems.M1.2.1 BracingDesign considerations related to both temporary andpermanent bracing differ among product types. Specificdiscussion of bracing is included in the product chapter.M1.3 Design ProceduresThe NDS is a dual <strong>for</strong>mat specification incorporatingdesign provisions <strong>for</strong> <strong>ASD</strong> and <strong>LRFD</strong>. Behavioral equations,such as those <strong>for</strong> member and connection design, arethe same <strong>for</strong> both <strong>ASD</strong> and <strong>LRFD</strong>. Adjustment factor tablesinclude applicable factors <strong>for</strong> determining an adjusted<strong>ASD</strong> design value or an adjusted <strong>LRFD</strong> design value. NDSAppendix N – (Mandatory) Load and Resistance FactorDesign (<strong>LRFD</strong>) and product chapters outline requirementsthat are unique to <strong>LRFD</strong> and adjustment factors <strong>for</strong> <strong>LRFD</strong>.The basic design equations <strong>for</strong> <strong>ASD</strong> or <strong>LRFD</strong> requirethat the specified product adjusted design value meet orexceed the actual (applied) stress or other effect imposedby the specified loads. Load combination equations <strong>for</strong>use with <strong>ASD</strong> and <strong>LRFD</strong> are given in the model buildingcodes.AMERICAN WOOD COUNCIL
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