Report •
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MA's - 8
LATERAL Design
BOTTERON ADDITION
Tigard, Oregon
Dorthe Bugbee - Designer
DESIGN LOADS: (2011 ORSC)
Wind: 95 mph Exposure B
Seismic Design Category D1
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Job No. 6124
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TIM COVERT P.E. STRUCTURAL ENGINEER
1750 SW Skyline Blvd Rm 221
Portland, Oregon 97221 Phone:(503) 228-0426
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WALL CONSTRUCTION
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TABLE R602.10.1.2(1)a,b,c,d,e_.. mued bkr'
BRACING REQUIREMENTS BASE N WIND SPEED
(as a function of braced wal line spacing)
EXPOSURE CATEGORY B,30 FT MEAN ROOF HEIGHT,
10 FT EAVE TO RIDGE HEIGHT,
10 FT WALL HEIGHT, MINIMUM TOTAL LENGTH(feet)OF BRACED WALL PANELS REQUIRED ALONG
2 BRACED WALL LINES EACH BRACED WALL LINE
4 4.aasrm►
Method DWB,
Basic Wind Speed Story Braced wall Method GB WSP,SFB,PBS, Continuous
(mph) Location Line Spacing(feet) Method LIBf•h (doubled sided)9 PCP,HPSI•' Sheathing
10 4.0 4.0 2.25 2.25
A 20 7.75 7.75 4.5 3.75
AE 30 10.75 10.75 6.25 5.5
I
1
40 14.0 14.0 8.25 6.75
50 17.25 17.25 10.0 8.5
60 20.5 20.5 11.75 1 10.0
10 7.75 7.75 4.5 4.0
A 20 14.5 14.5 _ 8.25 7.25
T 95 A • 30 20.75 20.75 11.75 10.0
(mph) • E 40 26.75 26.75 15.5 13.25
50 33.0 33.0 19.0 16.25
60 39.25 39.25 22.5 19.0
10 NP 11.5 6.75 5.5
A 20 NP _ 21.25 12.25 10.5
• 30 NP 30.75 17.5 15.0
■ 40 NP 39.75 22.75 19.5
50 NP 49.0 28.0 24.0
60 NP 58.0 33.25 28.25
10 4.5 4.5 2.5 2.5
A 20 8.5 8.5 5.0 4.0
A L 30 12.0 12.0 7.0 6.0
A r ■ 40 15.5 15.5 9.0 7.5
50 19.0 19.0 11.0 9.5
60 22.5 22.5 13.0 11.0
10 8.5 8.5 5.0 4.5
A 20 16.0 _ 16.0 9.0 8.0
_< 100 A • 30 23.0 23.0 13.0 11.0
(mph) •
8 E_ � ` 40 29.5 29.5 17.0 14.5
■
50 36.5 36.5 21.0 18.0
60 43.5 43.5 25.0 21.0
10 NP 12.5 7.5 6.0
20 NP 23.5 13.5 11.5
30 NP 34.0 19.5 16.5
40 NP 44.0 25.0 21.5
50 NP 54.0 31.0 26.5
60 NP 64.0 36.5 31.0
(continued)
2011 OREGON RESIDENTIAL SPECIALTY CODE 6-17
,.
WALL CONSTRUCTION MT- S
TABLE R602.10 . (2)a,b,c
BRACING REQUIREMENTS BASE. •N SEISMIC DESIGN CATEGORY
(AS A FUNCTION OF BRA ED WALL LINE LENGTH) w
SOIL CLASS Da
WALL HEIGHT=10 FT
10 PSF FLOOR DEAD LOAD
15 PSF ROOF/CEILING DEAD LOAD MINIMUM TOTAL LENGTH(feet)OF BRACED WALL PANELS REQUIRED
BRACED WALL LINE SPACING s 25 FT ALONG EACH BRACED WALL LINE
Seismic Design Methods
Category Braced Wall DWB,SFB,GB,
(SDC) Story Location Line Length Continuous
9 Method LIB PBS,PCP,HPS Method WSP Sheathing
SDC A and B Exempt from Seismic Requirements
and Detached Dwellings in C Use Table R602.10.1.2(1)for Bracing Requirements
10 2.5 2.5 1.6 1.4
- 20 5.0 5.0 3.2 2.7
i i : 30 7.5 7.5 4.8 4.1
40 10.0 10.0 6.4 5.4
50 12.5 12.5 8.0 6.8
10 NP 4.5 3.0 2.6
20 NP 9.0 6.0 5.1
SDC C /� ■ 30 NP 13.5 9.0 7.7
{Lj� • 40 NP 18.0 12.0 10.2
50 NP 22.5 15.0 12.8
10 NP 6.0 4.5 3.8
- 20
NP 12.0 9.0 7.7
n' A.'
30 N
P 18.0 13.5 11.5
L 40 NP 24.0 18.0 15.3
50 NP 30.0 22.5 19.1
is
10 NP 3.0 2.0 1.7
A
20 NP 6.0 4.0 3.4
30 NP 9.0 6.0 5.1
40 NP 12.0 8.0 6.8
50 NP 15.0 10.0 8.5
10 NP 6.0 4.5 ' 3.8
20 NP 12.0 9.0 7.7
S1J1r D,
Q � 30 NP 18.0 13.5 11.
40
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� 24.0 18.0 15.35
54325140000000
0 NP 30.0 22.5 19.1
10 NP 8.5 6.0 5.1
i
- 20
■ NP 17M 12.0 10.2
n I 30 NP 25.5 18.0 15.3
1LJ'` 40 NP 34.0 24.0 20.4
50 NP 42.5 30.0 25.5
(continued)
6-20
gni 1 ORFOON RFSIDFNTIAL SPECIALTY CODE
T
4.
City of Tigard • COMMUNITY DEVELOPMENT DEPARTMENT
7. Prescriptive Wall Bracing Worksheet
TIGARD 13125 SW Hall Blvd. • Tigard, Oregon 97223 • 503.718.2439 • wwwtigard-or.gov
See Residential Wall Bracing Guide for step-by-step instructions on how to use this worksheet.
WIND ADJUSTMENT FACTORS
Table R602.10.1.2(1)assumes wind exposure category B, 30 ft mean roof height, 10 ft eave to Numbered Lettered
ridge height, 10 ft wall height,and 2 braced wall lines sharing load in a given plan direction on a Wall Lines Wall Lines
1st rd 3rd 1st 2oa 3rd
given story level. For any other conditions,apply the appropriate adjustment factors.
Story Story Story Story Story Story
EXPOSURE FACTOR -select adjustment factor based on exposure and story height:
(Exposure B is typical. Exposure C only occurs where exposed to open terrain such as shorelines) 1 0 1.0 ,
x
Exposure B - 1 story=1.0 -2 story=1.0 -3 story=1.0
Exposure C - 1 story=1.2 -2 story=1.3 -3 story=1.4
EAVE HEIGHT FACTOR-select support condition&height to determine adjustment factor:
1.0 X Y- I.0 X
Support Condition Roof Eave To Ridge Height
<5ft <10ft <15ft <20ft
1 Story or Top Story of2or3 Story 0.7 1.0 1.3 1.6
1St Story of 2 Story or 2°a Story of 3 Story 0.85 1.0 1.15 1.3
1St Story of 3 Story 0.9 1.0 1.1 NP
WALL HEIGHT FACTOR-select adjustment factor based on ceiling height:
- 8 Ft Ceiling = 0.90 -9 Ft Ceiling = 0.95 -10 Ft Ceiling= 1.0 0• 1 K 0./ x x
- 11 Ft Ceiling= 1.05 -12 Ft Ceiling= 1.10
NO.OF BRACED WALL LINES FACTOR
-select adjustment factor based on number of braced wall lines: 1.3 x /.0 X
-2 Wall Lines: 1.0 - 3 Wall Lines: 1.30 - 4 Wall Lines: 1.45 -5 Wall Lines: 1.60
TOTAL GENERAL WIND ADJUSTMENT FACTORS -
Multiply all of the above adjustment factors for each story: 1.17 . K Q. �e K
SPECIFIC WIND ADJUSTMENT FACTORS-Specific to certain types of bracing methods or building conditions:
GYPSUM WALL BOARD FACTOR-Apply 1.4 adjustment factor if all the following conditions occur:
-Bracing method is either DWB,WSP,FSB,PBS,PCP or HPS and
-Gypsum board is not applied to inside face of braced wall panels. @ Braced Wall Lines
@ Story
GYPSUM WALL BOARD BRACING METHOD-Apply 0.7 adjustment factor if all of the following conditions are met:
-Bracing method is GB and
-Gypsum board is attached with 4"spacing at panel edges,including top and bottom plates and
-Blocking is provided at all horizontal joints. X @ Braced Wall Lines
@ Story
ONE SIDED GYPSUM WALL BOARD FACTOR-Apply 2.0 adjustment factor if all of the following conditions are met:
-Bracing method is GB and
-Gypsum board is only attached to one side. $4 @ Braced Wall Lines
@ Story
HOLD DOWN FACTOR-Apply 0.8 adjustment factor if all of the following conditions are met:
- -Bracing method is DWB,WSP,SFB,PBS,PCP and HPS methods and
-Limited to 1 story buildings or top story of 2 or 3 story buildings and
-800#hold down installed at each end of braced wall panels along the braced wall line.
'(eS @ Braced Wall Lines @OI
@ Story
CRIPPLE WALL BRACING-Apply 1.15 adjustment factor if cripple walls occur
Wall panel spacing shall be decreased to 18 ft.See additional requirements in Section 602.10.9.1
X @ Braced Wall Lines
All information in this document is subject to change. Prescriptive Wall Bracing Worksheet Rev. 1/2012 Page 1
City of Tigard • COMMUNITY DEVELOPMENT DEPARTMENT
" p Prescri tive Wall Bracing Worksheet
TIGARD 13125 SW Hall Blvd. • Tigard, Oregon 97223 • 503.718.2439 • wwwtigard-or.gov
SEISMIC ADJUSTMENT FACTORS
STORY HEIGHT FACTOR-Select the adjustment factor based on story height All Wall Lines
<10ft= 1.0 < 11 ft= 1.1 < 12ft= 1.2 (. C7
BRACED WALL LINE SPACING FACTOR- Select the adjustment factor if braced wall line spacing is greater than
25 ft. The spacing can only exceed 25 ft once in each direction. When a braced wall line has a parallel braced wall line on both sides,
the larger adjustment factor shall be used. See additional requirements in Section 602.10.1.5
<25ft = 1.0 < 30 ft = 1.2 <35ft = 1.4 Q
I• V @ Braced Wall Lines 0
@ Story X
I• @ Braced Wall Lines CP
@ Story 74
WALL DEAD LOAD FACTOR-Apply 0.85 adjustment factor if wall dead load is less than or
equal to 8 psf. (This applies only to interior walls with gypsum board on each side.)
.0 @ Braced Wall Lines A L.L.
@ Story
ROOF/CEILING DEAD LOAD FACTOR FOR WALL SUPPORTING-Select adjustment factor based on the roof/ceiling dead
load and wall support condition. (Typical composition or metal roof covering will have a roof dead load< 15psf if no ceiling fmish is
installed. The addition of a finished ceiling will increase the dead load to> 15 psf.
Wall Supporting Roof/Ceiling Dead Load Adj.Factor
Roof Only < 15 psf 1.0
Roof Only >15 psf<25 psf 1.1
Roof plus Occupied Attic > 15 psf<25 psf 1.2
1. @ Braced Wall Lines A LA,
@ Story
CRIPPLE WALL BRACING-Apply 1.15 adjustment factor if cripple walls occur.
Wall panel spacing shall be decreased to 18 ft.See additional requirements in Section 602.10.9.1
@ Braced Wall Lines x
@ Story
WALLS WITH STONE OR MASONRY VENEER
See Section 602.12 and 703.7. Braced wall length shall not be less than required by Table 602.12(2)
gj.tJ• Dt .
All information in this document is subject to change. Prescriptive Wall Bracing Worksheet Rev. 1/2012 Page 2
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11111 City of gard • COMMUNITY DEVELOPMENT DEPARTMENT v `
Prescri five Wall BracingWorksheet
p
TIGARD 13125 SW Hall Blvd. • Tigard, Oregon 97223 • 503.718.2439 • wwwtigard-or.gov
CALCULATIONS FOR LENGTH OF BRACED WALL PANELS STORY I ST
Multiply all adjustment factors and the required wall bracing lengths to determine the total adjusted wall bracing length for each wall line for wind
and for seismic.The bracing length provided shall be equal to or greater than the higher of the two. Provide a separate calculation for each story.
WIND CALCULATION Refer to Table R602.10.1.2(1)
Braced Bracing Braced Required General Wind Specific-Wind Total Adjusted-Bracing Length Bracing
Wall Line Method Wall Line Bracing Adjustment Adjustment
1 (Required Bracing Length Length
Spacing Length Factor Factor(s)* X All Adjustment Factors) Provided
1 GS (2( Z.C" ( . 0 1.0 Z. Cor 4 i6 - tt` l_o/
2 GS 46. ' 7. S' 1. 0 /.17 `t- 2` < Zp!g"
3
4
5
A CS 23` q-.3 ' _ (. 0 , 1. D 41:3 ' q=o" m
B C S 23 l 4.3 ( (. 0 (. o 4 3 t 4 -7 ' 411
c
D
E
*A braced wall line may have more than one specific wind adjustment factor.
SEISMIC CALCULATION Refer to Table R602.10.1.2(2)
Braced Bracing Braced Required Seismic Total Adjusted Bracing Length Bracing
Wall Line Method Wall Line Bracing Adjustment
J (Required Bracing Length Length
.Length— Length Factor(s)* X All Adjustment Factors) Provided
1 C-S ( 2 ` 2 . I ' ( . 0 2. ‘ < (S= 1 "
2 G S q-(,0.' 7,g l' I. 1- ( I ( G. 201 8" vie,
3
4
5
A c..s 231 3•q' ' (•0 3-q < ' g (v"
B G s 23' 3•q ' [. 0 3,R r < 7=4-1
C
` - D
E
*A braced wall line will be likely to have more than one seismic adjustment factor.Show all adjustment factors.
All information in this document is subject to change. Prescriptive Wall Bracing Worksheet Rev.1/2012 Page 3
4 l (2' BotTe-,2-° (`C16A-(24)) C-3 - (Z (A 9
1/2" plywood one side j
installed continuously... 1/2" plywood one side
above and below all . '�� installed continuously...
openings, typical. above and below all
^ a openings, typical.
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HOLD-DOWN NOTES:
A = Simpson "HTT4" hold-downs w/ Simpson "SSTBI6L" Anchor 7:1pRof
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Provide double 2x6 (min) end studs at these hold-downs. Fff�"4�
OVER-ALL BRACE WALL PLAN .
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Notes Provide corner bars 014 x 24" F-24" ) .. 1;
at ALL continuous horizontal bars
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at ALL corners and intersections .
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SHEATHING SCHEDULE: BOTTERON ADDITION
Roof Sheathing: 1/2" plywood (32/16) or APA rated sheathing
(Oriented strand board (OSB) or plywood okay)
With 8d corn nails at 6" o/c all panel edges
And 8d corn nails at 12" o/c field.
(Edges may be unblocked for shear) (240/180)
Floor Sheathing: 1-1/8"plywood (48oc) or APA rated sheathing
With 10d corn nails at 6" o/c all panel edges
And 10d corn nails at 10" o/c field.
(Edges may be unblocked for sheaf) (285/215)
Exterior Walls: 1/2" plywood (32/16) or APA rated sheathing (See Note below)
(Typical) With 8d corn nails at 6" o/c all panel edges
And 8d corn nails at 12" o/c field.
All edges must be blocked. (260/365)
Anchor Bolts: P.T. 2x6 (min) sill plates with 5/8" dia X 12"Anchor Bolts at 48" o/c.
(Typical) Provide plate washers between nut and sill plate: PL 1/4"x 3" square. El
Hurricane Ties: Connect each truss to each support
with (1) Simpson "H-3" or"H-2.5"tie.
Note: Wall sheathing must be installed "continuously" (above and below all openings), typical.
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