ASD/LRFD Manual - American Wood Council

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ASD/LRFD Manual for Engineered Wood Construction 99 M15: SPECIAL LOADING CONDITIONS M15.1 Lateral Distribution of Concentrated Loads 100 M15.2 Spaced Columns 100 M15.3 Built-Up Columns 100 M15.4 Wood Columns with Side Loads and Eccentricity 100 15 American Forest & paper association
100 M15: SPECIAL LOADING CONDITIONS M15.1 Lateral Distribution of Concentrated Loads M15.1.1 Lateral Distribution of a Concentrated Load for Moment The lateral distribution factors for moment in NDS Table 15.1.1 are keyed to the nominal thickness of the flooring or decking involved (2" to 6" thick). Spacing of the stringers or beams is based on recommendations of the American Association of State Highway and Transportation Officials. Lateral distribution factors determined in accordance with NDS Table 15.1.1 can be used for any type of fixed or moving concentrated load. M15.1.2 Lateral Distribution of a Concentrated Load for Shear The lateral distribution factors for shear in NDS Table 15.1.2 relate the lateral distribution of concentrated load at the center of the beam or stringer span as determined under NDS 15.1.1, or by other means, to the distribution of load at the quarter points of the span. The quarter points are considered to be near the points of maximum shear in the stringers for timber bridge design. M15.2 Spaced Columns As used in the NDS, spaced columns refer to two or more individual members oriented with their longitudinal axis parallel, separated at the ends and in the middle portion of their length by blocking and joined at the ends by split ring or shear plate connectors capable of developing required shear resistance. The end fixity developed by the connectors and end blocks increases the load-carrying capacity in compression parallel to grain of the individual members only in the direction perpendicular to their wide faces. AF&PA’s Wood Structural Design Data (WSDD) provides load tables for spaced columns. M15.3 Built-Up Columns As with spaced columns, built-up columns obtain their efficiency by increasing the buckling resistance of individual laminations. The closer the laminations of a mechanically fastened built-up column deform together (the smaller the amount of slip occurring between laminations) under compressive load, the greater the relative capacity of that column compared to a simple solid column of the same slenderness ratio made with the same quality of material. M15.4 Wood Columns with Side Loads and Eccentricity The eccentric load design provisions of NDS 15.4.1 are not generally applied to columns supporting beam loads where the end of the beam bears on the entire cross section of the column. It is standard practice to consider such loads to be concentrically applied to the supporting column. This practice reflects the fact that the end fixity provided by the end of the column is ignored when the usual pinned end condition is assumed in column design. In applications where the end of the beam does not bear on the full cross section of the supporting column, or in special critical loading cases, use of the eccentric column loading provisions of NDS 15.4.1 may be considered appropriate by the designer. American Wood Council
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2005 EDITION ASD/LRFD MANUAL MANUAL
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Updates and Errata While every prec
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ii ASD/LRFD MANUAL FOR ENGINEERED W
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iv ASD/LRFD MANUAL FOR ENGINEERED W
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viii ASD/LRFD MANUAL FOR ENGINEERED
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ASD/LRFD MANUAL FOR ENGINEERED Wood
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M1: general requirements for struct
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M2: DESIGN VALUES FOR STRUCTURAL ME
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M3: Design Provisions and Equations
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M3: Design Provisions and Equations
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10 M3: Design Provisions and Equati
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12 M4: SAWN LUMBER M4.1 General Pro
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14 M4: SAWN LUMBER M4.4 Special Des
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16 M4: SAWN LUMBER Table M4.4-3 Coe
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18 M4: SAWN LUMBER Table M4.5-1a AS
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20 M4: SAWN LUMBER Table M4.5-2b AS
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22 M4: SAWN LUMBER Table M4.5-3a AS
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24 M4: SAWN LUMBER Table M4.5-4c AS
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26 M4: SAWN LUMBER Column Capacity
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28 M5: structural glued laminated t
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34 M6: ROUND TIMBER POLES AND PILES
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36 M6: ROUND TIMBER POLES AND PILES
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38 M7: PREFABRICATED WOOD I-JOISTS
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Page 73 and 74: 60 M9: WOOD STRUCTURAL PANELS M9.1
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Page 99 and 100: 86 M11: DOWEL-TYPE FASTENERS M11.1
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Page 103 and 104: 90 M12: SPLIT RING AND SHEAR PLATE
Page 105 and 106: 92 M13: TIMBER RIVETS M13.1 General
Page 107 and 108: 94 M14: SHEAR WALLS AND DIAPHRAGMS
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Page 115 and 116: 102 M16: FIRE DESIGN M16.1 General
Page 117 and 118: 104 M16: FIRE DESIGN Table M16.1-4
Page 119 and 120: 106 M16: FIRE DESIGN Figure M16.1-2
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150 M16: FIRE DESIGN Table M16.2-4
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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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160 M16: FIRE DESIGN Figure M16.3-5
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American Forest & Paper Association
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