By American Wood Council
Wind and Seismic layout advisor, published to be used with 2005 NDS wooden layout package deal.
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Additional resources for ASD/LRFD Wind & Seismic, Special Design Provisions For Wind And Seismic, With Commentary
Maximum nail spacing of 6" on center along intermediate framing members. 3. 2" nominal or wider framing at adjoining panel edges. 4. Maximum stud spacing of 16" on center. 5. Minimum length of galvanized roofing nails is 1-½" for ½" thick sheathing and 1-¾" for 25/32" thick sheathing. 6. 1 or ASTM C 208. 4 Gypsum Wallboard, Gypsum Veneer Base, Water-Resistant Backing Board, Gypsum Sheathing, Gypsum Lath and Plaster, or Portland Cement Plaster Shear Walls: Shear walls sheathed with gypsum wallboard, gypsum veneer base, water-resistant backing board, gypsum sheathing, gypsum lath and plaster, or portland cement plaster shall be permitted to be used to resist wind forces and seismic forces in Seismic Design Categories A through D.
As a result, diaphragm dimension and diaphragm aspect ratio limitations are provided for different building configurations. The test for torsional irregularity is consistent with general seismic design requirements (5). 1 Open Front Structures: A structure with shear walls on three sides only (open front) is one category of structure that requires transfer of forces through rotation. Shear force is transferred to shear wall(s) parallel to the applied force and moment due to eccentric loading is transferred into perpendicular walls.
1. 3 to determine ASD allowable unit shear capacity and LRFD factored unit resistance. 6. 3 for fiberboard shear walls. 2. Shears are permitted to be increased to values shown for 15/32 inch sheathing with same nailing provided (a) studs are spaced a maximum of 16 inches on center, or (b) panels are applied with long dimension across studs. 3. 5 – G)], where G = Specific Gravity of the framing lumber from the NDS. The Specific Gravity Adjustment Factor shall not be greater than 1. 4. Apparent shear stiffness values, Ga, are based on nail slip in framing with moisture content less than or equal to 19% at time of fabrication and panel stiffness values for shear walls constructed with OSB panels.
ASD/LRFD Wind & Seismic, Special Design Provisions For Wind And Seismic, With Commentary by American Wood Council