2008 Special Design Provisions for Wind and Seismic Standard (ANSI AF&PA SDPWS-08)

Wind & Seismic Cover......Page 1
Wind & Seismic......Page 3
Copyright......Page 4
List of Tables......Page 5
List of Commentary Figures......Page 6
1 Designer Flowchart......Page 7
1.1 Flowchart......Page 8
2 General Design Requirements......Page 9
2.2 Terminology......Page 10
2.3 Notation......Page 12
3 Members and Conections......Page 13
3.2.1 Wall Sheathing......Page 14
Table 3.2.1 Nominal Uniform Load Capacities ( psf) for Wall Sheathing Resisting Out-of-Plane Wind Loads1......Page 15
3.3 Connections......Page 16
4 Lateral Force-Resisting systems......Page 17
4.1.5 Wood Members and Systems Resisting Seismic Forces Contributed by Masonry and Concrete Walls......Page 18
4.2.3 Unit Shear Capacities......Page 19
Figure 4A Open Front Structure......Page 20
4.2.7 Diaphragm Assemblies......Page 21
Figure 4C High Load Diaphragm......Page 23
Table 4.2A Nominal Unit Shear Capacities for Wood- Frame Diaphragms - Blocked Wood Structural Panel Diaphragms......Page 24
Table 4.2B Nominal Unit Shear Capacities for Wood- Frame Diaphragms - Blocked Wood Structural Panel Diaphragms Utilizing Multiple Rows of Fasteners ( High Load Diaphragms)......Page 25
Table 4.2C Nominal Unit Shear Capacities for Wood- Frame Diaphragms - Unblocked Wood Structural Panel Diaphragms......Page 26
Table 4.2D Nominal Unit Shear Capacities for Wood- Frame Diaphragms - Lumber Diaphragms......Page 27
4.3.3 Unit Shear Capacities......Page 28
Table 4.3.3.2 Unblocked Shear Wall Adjustment Factor, Cub......Page 29
4.3.4 Shear Wall Aspect Ratios......Page 30
Figure 4D Typical Shear Wall Height- to- Width Ratio for Perforated Shear Walls......Page 31
Figure 4F Typical Shear Wall Height- to- Width Ratio for Shear Walls Designed for Force Transfer Around Openings......Page 32
4.3.6 Construction Requirements......Page 33
4.3.7 Shear Wall Systems......Page 34
Table 4.3A Nominal Unit Shear Capacities for Wood- Frame Shear Walls - Wood- based Panels......Page 37
Table 4.3B Nominal Unit Shear Capacities for Wood- Frame Shear Walls - Wood Structural Panels Applied over 1/ 2" or 5/ 8" Gypsum Wallboard or Gypsum Sheathing Board......Page 38
Table 4.3C Nominal Unit Shear Capacities for Wood- Frame Shear Walls - Gypsum and Portland Cement Plaster......Page 39
Table 4.3D Nominal Unit Shear Capacities for Wood- Frame Shear Walls - Lumber Shear Walls......Page 40
4.4.1 Application......Page 41
Figure 4G Panel Attachment......Page 42
Figure 4I Panel Splice Occurring across Studs......Page 43
Figure 4J Sheathing Splice Plate ( Alternate Detail)......Page 44
Table 4.4.2 Nominal Uplift Capacity of 3/ 8" Minimum Wood Structural Panel Sheathing or Siding When Used for Wind Uplift Only over Framing with a Specific Gravity of 0.42 or Greater......Page 45
Appendix A......Page 47
Table A2 Standard Cut Washers......Page 48
References......Page 49
References......Page 50
SDPWS Commentary......Page 51
Foreword......Page 52
C2.2 Terminology......Page 53
C3.2 Sheathing......Page 55
Table C3.2C Cellulosic Fiberboard Sheathing Design Bending Strength Capacities......Page 56
EXAMPLE C3.2.1-1 Determine the Nominal Uniform Load Capacity in SDPWS Table 3.2.1......Page 57
C3.3 Connections......Page 58
C4.1 General......Page 59
C4.2.2 Deflection......Page 60
Table C4.2.2B Shear Stiffness, Gvtv ( lb/in. of depth), for Other Sheathing Materials......Page 61
EXAMPLE C4.2.2-2 Derive Ga in SDPWS Table 4.2B......Page 62
Table C4.2.2D Fastener Slip, en ( in.)......Page 63
C4.2.3 Unit Shear Capacities......Page 64
Figure C4.2.2-3b Diaphragm Chord, Double Top Plate with Two Joints in Upper Plate......Page 65
EXAMPLE C4.2.2-3 Calculate Mid-Span Diaphragm Deflection ( continued)......Page 66
C4.2.5 Horizontal Distribution ofShear......Page 67
C4.2.7 Diaphragm Assemblies......Page 68
Figure C4.2.7.1.1( 3) Staggering of Nails at Panel Edges of Blocked Diaphragms......Page 69
C4.3.2 Deflection......Page 70
Figure C4.3.2 Comparison of 4-Term and 3-Term Deflection Equations......Page 71
Table C4.3.2A Data Summary for Structural Fiberboard, Gypsum Wallboard, and Lumber Sheathed Shear Walls......Page 72
EXAMPLE C4.3.2-1 Calculate the Apparent Shear Stiffness, Ga, in SDPWS Table 4.3A......Page 73
C4.3.3 Unit Shear Capacities......Page 74
C4.3.4 Shear Wall Aspect Ratios......Page 75
C4.3.6 Construction Requirements......Page 76
Figure C4.3.6.4.3 Distance for Plate Washer Edge to Sheathed Edge......Page 77
C4.3.7 Shear Wall Systems......Page 78
C4.4.1 Application......Page 79
C4.4.2 Wood Structural PanelsDesigned to Resist Only Upliftfrom Wind......Page 80
EXAMPLE C4.4.1-1 Calculate Nominal Uplift Capacity for Combined Uplift and Shear Case......Page 81
EXAMPLE C4.4.2-1 Calculate Nominal Uplift Capacity for Wind Uplift Only Case......Page 82
Commentary References......Page 83
Back Cover......Page 87