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// CODE SNIPPET

Section 2305 General Design Requirements for Lateral Force-Resisting Systems

Building Code 2018 of Illinois > 23 Wood > 2305 General Design Requirements for Lateral Force-Resisting Systems
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2305.1 General

Structures using wood-frame shear walls or wood-frame diaphragms to resist wind, seismic or other lateral loads shall be designed and constructed in accordance with AWC SDPWS and the applicable provisions of Sections 2305, 2306 and 2307.

2305.1.1 Openings in Shear Panels

Openings in shear panels that materially affect their strength shall be detailed on the plans and shall have their edges adequately reinforced to transfer all shearing stresses.

2305.2 Diaphragm Deflection

The deflection of wood-frame diaphragms shall be determined in accordance with AWC SDPWS. The deflection (Δdia) of a blocked wood structural panel diaphragm uniformly fastened throughout with staples is permitted to be calculated in accordance with Equation 23-1. If not uniformly fastened, the constant 0.188 (For SI: 1/1627) in the third term shall be modified by an approved method.

Δdia = 5vL3/8EAW + vL/4Gt + 0.188Len + Σ(xΔc)/2W (Equation 23-1)

For SI: Δdia = 0.052vL3/EAW + vL/4Gt + Len/1627 + Σ(xΔc)/2W
where:
A = Area of chord cross section, in square inches (mm2).
E = Modulus of elasticity of diaphragm chords, in pounds per square inch (N/mm2).
en = Staple slip, in inches (mm) [see Table 2305.2(1)].
Gt = Panel rigidity through the thickness, in pounds per inch (N/mm) of panel width or depth [see Table 2305.2(2)].
L = Diaphragm length (dimension perpendicular to the direction of the applied load), in feet (mm).
v = Induced unit shear in pounds per linear foot (plf) (N/mm).
W = Diaphragm width [in the direction of applied force, in feet (mm)].
x = Distance from chord splice to nearest support, in feet (mm).
Δc = Diaphragm chord splice slip at the induced unit shear, in inches (mm).
Δdia = Maximum mid-span diaphragm deflection determined by elastic analysis, in inches (mm).
TABLE 2305.2(1)
en VALUES (inches) FOR USE IN CALCULATING DIAPHRAGM AND SHEAR WALL DEFLECTION DUE TO FASTENER SLIP (Structural I)a, c
LOAD PER FASTENERb
(pounds)
FASTENER DESIGNATIONS
14-Ga staple × 2 inches long
600.011
800.018
1000.028
1200.04
1400.053
1600.068
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound = 4.448 N.
  1. Increase en values 20 percent for plywood grades other than Structural I.
  2. Load per fastener = maximum shear per foot divided by the number of fasteners per foot at interior panel edges.
  3. Decrease en values 50 percent for seasoned lumber (moisture content < 19 percent).
TABLE 2305.2(2)
VALUES OF Gt FOR USE IN CALCULATING DEFLECTION OF WOOD STRUCTURAL PANEL SHEAR WALLS AND DIAPHRAGMS
PANEL
TYPE
SPAN
RATING
VALUES OF Gt (lb/in. panel depth or width)
Structural SheathingStructural I
PlywoodOSBPlywoodOSB
3-ply4-ply5-plya3-ply4-ply5-plya
Sheathing24/025,00032,50037,50077,50032,50042,50041,50077,500
24/1627,00035,00040,50083,50035,00045,50044,50083,500
32/1627,00035,00040,50083,50035,00045,50044,50083,500
40/2028,50037,00043,00088,50037,00048,00047,50088,500
48/2431,00040,50046,50096,00040,50052,50051,00096,000
Single Floor16 o.c.27,00035,00040,50083,50035,00045,50044,50083,500
20 o.c.28,00036,50042,00087,00036,50047,50046,00087,000
24 o.c.30,00039,00045,00093,00039,00050,50049,50093,000
32 o.c.36,00047,00054,000110,00047,00061,00059,500110,000
48 o.c.50,50065,50076,000155,00065,50085,00083,500155,000
Structural SheathingStructural I
Thickness
(in.)
A-A,
A-C
MarineAll Other
Grades
A-A,
A-C
MarineAll Other
Grades
Sanded Plywood1/424,00031,00024,00031,00031,00031,000
11/3225,50033,00025,50033,00033,00033,000
3/826,00034,00026,00034,00034,00034,000
15/3238,00049,50038,00049,50049,50049,500
1/238,50050,00038,50050,00050,00050,000
19/3249,00063,50049,00063,50063,50063,500
5/849,50064,50049,50064,50064,50064,500
23/3250,50065,50050,50065,50065,50065,500
3/451,00066,50051,00066,50066,50066,500
7/852,50068,50052,50068,50068,50068,500
173,50095,50073,50095,50095,50095,500
11/875,00097,50075,00097,50097,50097,500
For SI: 1 inch = 25.4 mm, 1 pound/inch = 0.1751 N/mm.
  1. 5-ply applies to plywood with five or more layers. For 5-ply plywood with three layers, use values for 4-ply panels.

2305.3 Shear Wall Deflection

The deflection of wood-frame shear walls shall be determined in accordance with AWC SDPWS. The deflection (Δsw) of a blocked wood structural panel shear wall uniformly fastened throughout with staples is permitted to be calculated in accordance with Equation 23-2.

Δsw = 8vh3/EAb + vh/4Gt + 0.75hen + dah/b (Equation 23-2)

where:
A = Area of end-post cross section in square inches (mm2).
b = Shear wall length, in feet (mm).
da = Total vertical elongation of wall anchorage system (such as fastener slip, device elongation, rod elongation) at the induced unit shear in the shear wall (v).
E = Modulus of elasticity of end posts, in pounds per square inch (N/mm2).
en = Staple slip, in inches (mm) [see Table 2305.2(1)].
Gt = Panel rigidity through the thickness, in pounds per inch (N/mm) of panel width or depth [see Table 2305.2(2)].
h = Shear wall height, in feet (mm).
v = Induced unit shear, in pounds per linear foot (N/mm).
Δsw = Maximum shear wall deflection determined by elastic analysis, in inches (mm).

Related Code Sections


Section 2305 Wood, General Design Requirements for Lateral Force-Resisting Systems
Structures using wood-frame shear walls or wood-frame diaphragms to resist wind, seismic or other lateral loads shall be designed and constructed ...
Building Code 2018 of Illinois > 23 Wood > 2305 General Design Requirements for Lateral Force-Resisting Systems
Section 2305 Wood, General Design Requirements for Lateral Force-Resisting Systems
Structures using wood-frame shear walls or wood-frame diaphragms to resist wind, seismic or other lateral loads shall be designed ...
Building Code 2021 of Illinois > 23 Wood > 2305 General Design Requirements for Lateral Force-Resisting Systems
2305.2 Wood, Diaphragm Deflection
 = Diaphragm width [in the direction of applied force, in feet (mm)]. x = Distance from chord splice to nearest support, in feet (mm ...
Building Code 2021 of Illinois > 23 Wood > 2305 General Design Requirements for Lateral Force-Resisting Systems > 2305.2 Diaphragm Deflection
2305.3 Wood, Shear Wall Deflection
vertical elongation of wall anchorage system (such as fastener slip, device elongation, rod elongation) at the induced unit shear in the shear wall (v ...
Building Code 2018 of Illinois > 23 Wood > 2305 General Design Requirements for Lateral Force-Resisting Systems > 2305.3 Shear Wall Deflection
2305.3 Wood, Shear Wall Deflection
a  = Total vertical elongation of wall anchorage system (such as fastener slip, device elongation, rod elongation), in inches (mm), at the induced unit ...
Building Code 2021 of Illinois > 23 Wood > 2305 General Design Requirements for Lateral Force-Resisting Systems > 2305.3 Shear Wall Deflection
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