ASD/LRFD Manual - American Wood Council

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ASD/LRFD Manual for Engineered Wood Construction M2: DESIGN VALUES FOR STRUCTURAL MEMBERS 2 M2.1 General Information 4 M2.2 Reference Design Values 4 M2.3 Adjustment of Design Values 4 American Forest & paper association
M2: DESIGN VALUES FOR STRUCTURAL MEMBERS M2.1 General Information Structural wood products are provided to serve a wide range of end uses. Some products are marketed through commodity channels where the products meet specific standards and the selection of the appropriate product is the responsibility of the user. Other products are custom manufactured to meet the specific needs of a given project. Products in this category are metal plate connected wood trusses and custom structural glued laminated timbers. Design of the individual members is based on criteria specified by the architect or engineer of record on the project. Manufacture of these products is performed in accordance with the product’s manufacturing standards. Engineering of these products normally only extends to the design of the products themselves. Construction-related issues, such as load path analysis and erection bracing, remain the responsibility of the professional of record for the project. M2.2 Reference Design Values Reference design value designates the allowable stress design value based on normal load duration. To avoid confusion, the descriptor “reference” is used and serves as a reminder that design value adjustment factors are applicable for design values in accordance with referenced conditions specified in the NDS – such as normal load duration. Reference design values for sawn lumber and structural glued laminated timber are contained in the NDS Supplement: Design Values for Wood Construction. Reference design values for round timber poles and piles, dowel-type fasteners, split ring and shear plate connectors, and timber rivets are contained in the NDS. Reference design values for all other products are typically contained in the manufacturer’s code evaluation report. M2.3 Adjustment of Design Values Adjusted design value designates reference design values which have been multiplied by adjustment factors. Basic requirements for design use terminology applicable to both ASD and LRFD. In equation format, this takes the standard form f b ≤ F b ′ which is applicable to either ASD or LRFD. Reference design values (F b , F t , F v , F c , F c , E, E min ) are multiplied by adjustment factors to determine adjusted design values (F b ′, F t ′, F v ′, F c ′, F c ′, E′, E min ′). Reference conditions have been defined such that a majority of wood products used in interior or in protected environments will require no adjustment for moisture, temperature, or treatment effects. Moisture content (MC) reference conditions are 19% or less for sawn lumber products. The equivalent limit for glued products (structural glued laminated timber, structural composite lumber, prefabricated wood I-joists, and wood structural panels) is defined as 16% MC or less. Temperature reference conditions include sustained temperatures up to 100ºF. Note that it has been traditionally assumed that these reference conditions also include common building applications in desert locations where daytime temperatures will often exceed 100ºF. Examples of applications that may exceed the reference temperature range include food processing or other industrial buildings. Tabulated design values and capacities are for untreated members. Tabulated design values and capacities also apply to wood products pressure treated by an approved process and preservative except as specified for load duration factors. An unincised reference condition is assumed. For members that are incised to increase penetration of preservative chemicals, use the incising adjustment factors given in the product chapter. The effects of fire retardant chemical treatment on strength shall be accounted for in the design. Reference design values, including connection design values, for lumber and structural glued laminated timber pressuretreated with fire retardant chemicals shall be obtained from the company providing the treatment and redrying service. The impact load duration factor shall not apply to structural members pressure-treated with fire retardant chemicals. American Wood Council
Page 1 and 2: 2005 EDITION ASD/LRFD MANUAL MANUAL
Page 3 and 4: Updates and Errata While every prec
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54 M8: STRUCTURAL COMPOSITE LUMBER
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60 M9: WOOD STRUCTURAL PANELS M9.1
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62 M9: WOOD STRUCTURAL PANELS Table
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66 M9: WOOD STRUCTURAL PANELS M9.3
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68 M9: WOOD STRUCTURAL PANELS Table
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70 M10: MECHANICAL CONNECTIONS M10.
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86 M11: DOWEL-TYPE FASTENERS M11.1
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88 M11: DOWEL-TYPE FASTENERS Americ
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90 M12: SPLIT RING AND SHEAR PLATE
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92 M13: TIMBER RIVETS M13.1 General
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94 M14: SHEAR WALLS AND DIAPHRAGMS
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100 M15: SPECIAL LOADING CONDITIONS
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102 M16: FIRE DESIGN M16.1 General
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104 M16: FIRE DESIGN Table M16.1-4
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106 M16: FIRE DESIGN Figure M16.1-2
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122 M16: FIRE DESIGN Wood I-Joists
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132 M16: FIRE DESIGN Roof and Floor
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134 M16: FIRE DESIGN NER - 392 WTCA
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136 M16: FIRE DESIGN UL - P522 & P5
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138 M16: FIRE DESIGN NER - 392 WTCA
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140 M16: FIRE DESIGN Area Separatio
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156 M16: FIRE DESIGN Example 16.2-1
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158 M16: FIRE DESIGN For the fire d
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American Forest & Paper Association
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ASD/LRFD Manual - American Wood Council

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