2001 ASD Supplements - unprotected PDF - American Wood Council

More documents

Recommendations

Info

SW-14SHEAR WALLS4.1 GeneralA shear wall behaves similar to a horizontal diaphragm.In fact, a shear wall is simply a cantilevereddiaphragm to which load is applied at the top of the walland is transferred to the foundation along the bottom ofthe wall. This creates a potential for overturning whichmust be accounted for, and any over-turning force is typicallyresisted by hold-downs, or tension ties, at each endof the shear wall segments.Tables 4.1A and 4.1B present the tabulated values forwood structural panel sheathed wood frame shear wallsfor wind loading and seismic loading, respectively. Somemodel building codes have adopted a 40% increase forallowable shear wall resistance when subjected to windloading. For the convenience of the user of this Supplement,Table 4.1A reflects the 40% increase that may bepermissible. The designer should confirm that the increaseis applicable under the local code; if notapplicable, use Table 4.1B. The basis for the increase isa change in design philosophy for estimating wind forces.In addition, the increase helps to account for better understandingof wind loads and the historical excellentperformance of shear walls subjected to high wind events.4.2 Using Shear Wall TablesExample One:Given:• commercial building• wind loading• wall requires 5/8-inch gypsum sheathing on the exteriorof the building for 1-hour fire separation• required shear wall capacity is 670 lb./ft.Find:Panel thickness, nail size and nailing scheduleSolution:Ensure that the locally accepted building code allowsthe 40% increase for wind load incorporated in Table 4.1A.Using Table 4.1A, check the “Panels applied over 1/2- inchor 5/8-inch gypsum sheathing” area of table. Check“SHEATHING…” rows first since Structural I may notbe readily available in all areas. From the table, see that10d nails with a 3- and 12-in. nail spacing and any thicknessof Sheathing will provide a capacity of 685 lb./ft.provided that the framing at adjoining panel edges is 3-inchnominal or wider. As 685 lb./ft. is greater than 670 lb./ft.,this selection is OK for use.Example Two:Given:• residential building• seismic loading• typical wall sheathing thickness of 7/16 inch• typical nail size of 8d common• wall stud spacing of 24 inches oc.• required shear wall capacity is 435 lb./in.Find:Required nail spacingSolution:Using Table 4.1B, check the “Panels applied direct toframing” area of table. Check “SHEATHING…” rows firstbecause Structural I may not be readily available in allareas. From the table, see that 7/16-inch structural-usepanels, 8d nails with a 3- and 6-in. nail spacing (see footnoteb) will provide a capacity of 450 lb./ft. As 450 lb./ft.is greater than 435 lb./ft., this selection is OK for use.APA – The Engineered Wood Association
ASD WOOD STRUCTURAL PANEL SHEAR WALL AND DIAPHRAGM SUPPLEMENTSW-15Table 4.1A Recommended Shear (pounds per foot) For Wood Structural PanelShear Walls with Framing of Douglas fir-Larch or Southern Pine a ForWind Loading Only babcdPanel GradeStructural IgradesSheathing,PlywoodSiding gand otherstructural-usepanel gradesWIND LOADING ONLYNail SizePanels Applied OverPanels Applied Direct to Framing1/2 in. or 5/8 in. Gypsum SheathingMinimum Minimum Nail Nail SizeNail Spacing atNail Spacing atThickness (in.) in Framing (in.) Galvanized box) 6 4 3 2 e Galvanized box) 6 4 3 2 eNominal Panel Penetration (common orPanel Edges (in.)(common or Panel Edges (in.)5/16 1-1/4 6d 280 420 545 715 8d 280 420 545 7153/8 320 d 505 d 645 d 855 d7/16 1-3/8 8d 355 d 555 d 705 d 940 d 10d 390 600 770 f 102015/32 390 600 770 102015/32 1-1/2 10d 480 715 930 f 1220 - - - -5/16 or 1/4 c 250 270 490 630 250 380 490 6303/8 1-1/4 6d 280 420 545 715 8d 280 420 545 7153/8 310 d 450 d 575 d 740 d7/16 1-3/8 8d 335 d 490 d 630 d 820 d 10d 365 530 685 f 89515/32 365 530 685 89515/32 435 645 840 f 1080 - - - - -19/32 1-1/2 10d 475 715 930 f 1220 - - - - -PlywoodSiding gand otherNail Size(galvanized casing)Nail Size(galvanized casing)sructural- use 5/16 c 1-1/4 6d 195 295 385 505 8d 195 295 385 505panel grades 3/8 1-1/2 8d 225 335 435 575 10d 225 335 435 f 575For framing of other species: (1) Find specific gravity for species offraming lumber in the NDS. (2) Find shear value from table above for nailsize of actual grade. (3) Multiply value by the following adjustment factor= [1 - (0.5 - G)], where G = specific gravity of the framing lumber. Thisadjustment factor shall not be greater than 1.All panel edges backed with 2-in. nominal or wider framing. Install panelseither horizontally or vertically. Space nails maximum 6 inches o.c. alongintermediate framing members for 3/8-in. and 7/16-in. panels installed onstuds spaced 24 in. o.c. For other conditions and panel thickness, spacenails maximum 12 in. o.c. on intermediate supports.3/8-in. or Plywood Siding 16 o.c. is minimum recommended whenapplied direct to framing as exterior siding.Shears may be increased to values shown for 15/32-in. sheathing withsame nailing provided (1) studs are spaced a maximum of 16 in. o.c., or(2) if panels are applied with long dimension across studs.Framing at adjoining panel edges shall be 3-in. nominal or wider, andnails shall be staggered where nails are spaced 2 in. o.c.LoadFramingefgFraming at adjoining panel edges shall be 3-in. nominal or wider, andnails shall be staggered where 10d nails having penetration into framingof more than 1-5/8 in. are spaced 3 in. o.c.Values apply to all-veneer plywood Siding panels only. Other PlywoodSiding panels may also qualify on a proprietary basis. Plywood Siding 16o.c. plywood may be 11/32-in., 3/8-in. or thicker. Thickness at point ofnailing on panel edges governs shear values.Notes:The recommended shears presented in Table 4.1A are based on thehistorically used design stresses for shear walls which are listed in Table4.1B multiplied by 1.4. Some building codes, including the 2000International Building Code, have provided for this increase due to thebetter understanding of wind loading. The designer should confirm thatthe increase is applicable under the local code.4SHEAR WALLSBlocking, allpanel edgesShear wall boundaryBlocking, allpanel edgesFoundation resistanceAPA – The Engineered Wood Association
Page 1 and 2:
SUPPLEMENTStructural LumberASDALLOW
Page 3 and 4:
SUPPLEMENTStructural LumberASDALLOW
Page 5 and 6:
ASD WOOD STRUCTURAL FRAME CONSTRUCT
Page 7 and 8:
ASD STRUCTURAL LUMBER SUPPLEMENTL-1
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
SUPPLEMENTStructural GluedLaminated
Page 77 and 78:
ASD STRUCTURAL GLUED LAMINATED TIMB
Page 79 and 80:
ASD STRUCTURAL GLUED LAMINATED TIMB
Page 81 and 82:
GL-2DESIGNER FLOWCHART1.1 Flowchart
Page 83 and 84:
GL-4INTRODUCTION TO STRUCTURAL GLUE
Page 85 and 86:
GL-6INTRODUCTION TO STRUCTURAL GLUE
Page 87 and 88:
GL-8ALLOWABLE STRESS AND STIFFNESS3
Page 89 and 90:
GL-10ALLOWABLE STRESS AND STIFFNESS
Page 91 and 92:
GL-12ALLOWABLE STRESS AND STIFFNESS
Page 93 and 94:
GL-14DESIGN ADJUSTMENT FACTORS4.1 G
Page 95 and 96:
GL-16DESIGN ADJUSTMENT FACTORS4.9 V
Page 97 and 98:
GL-18DESIGN ADJUSTMENT FACTORSTable
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
GL-30CAPACITY SELECTION TABLES5.1 G
Page 111 and 112:
GL-32CAPACITY SELECTION TABLESTable
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
GL-56OTHER CONSIDERATIONS6.1 Genera
Page 137 and 138:
GL-58OTHER CONSIDERATIONSTable 6.3
Page 139 and 140:
GL-60OTHER CONSIDERATIONSAMERICAN W
Page 141 and 142:
GL-62LOAD AND SPAN TABLES7.1 Genera
Page 143 and 144:
GL-64LOAD AND SPAN TABLES7.2 Load-S
Page 145 and 146:
GL-66LOAD AND SPAN TABLESTable 7.2A
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
GL-76LOAD AND SPAN TABLESAMERICAN W
Page 157 and 158:
GL-78DESIGN EXAMPLES8.1 GeneralGene
Page 159 and 160:
GL-80SECTION PROPERTIES9.1 Cross Se
Page 161 and 162:
GL-82SECTION PROPERTIESTable 9.1(Co
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
SUPPLEMENTTimber Polesand PilesASDA
Page 175 and 176:
ASD WOOD TIMBER FRAME POLES CONSTRU
Page 177 and 178:
ASD WOOD TIMBER FRAME POLES CONSTRU
Page 179 and 180:
ASD TIMBER POLES AND PILES SUPPLEME
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
SUPPLEMENTWood StructuralPanelsASDA
Page 213 and 214:
ASD WOOD STRUCTURAL PANELS SUPPLEME
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
SP-2DESIGNER FLOWCHART1.1 Flowchart
Page 221 and 222:
SP-4INTRODUCTION TO WOOD STRUCTURAL
Page 223 and 224:
SP-6INTRODUCTION TO WOOD STRUCTURAL
Page 225 and 226: SP-8INTRODUCTION TO WOOD STRUCTURAL
Page 227 and 228: SP-10DESIGN CAPACITIES3.1 GeneralPa
Page 229 and 230: SP-12DESIGN CAPACITIESShear Through
Page 231 and 232: SP-14DESIGN CAPACITIESTable 3.2Pane
Page 233 and 234: SP-16DESIGN CAPACITIESTable 3.3Pane
Page 235 and 236: SP-18DESIGN CAPACITIESTable 3.4.1Ad
Page 237 and 238: SP-20DESIGN ADJUSTMENT FACTORS4.1 G
Page 239 and 240: SP-22DESIGN ADJUSTMENT FACTORS4.8 P
Page 241 and 242: SP-24SECTION PROPERTIES5.1 GeneralS
Page 243 and 244: SP-26OTHER CONSIDERATIONS6.1 Fasten
Page 245 and 246: SP-28OTHER CONSIDERATIONS• Volunt
Page 247 and 248: SP-30SUPPLEMENTAL DESIGN ASSISTANCE
Page 257 and 258: SUPPLEMENTWood StructuralPanel Shea
Page 259 and 260: ASD WOOD STRUCTURAL WOOD PANEL FRAM
Page 261 and 262: ASD WOOD STRUCTURAL WOOD PANEL FRAM
Page 263 and 264: ASD WOOD STRUCTURAL PANEL SHEAR WAL
Page 275: ASD WOOD STRUCTURAL PANEL SHEAR WAL
show all

2001 ASD Supplements - unprotected PDF - American Wood Council

Create successful ePaper yourself

Delete template?

Save as template?