Plans (10) lR' S S SGS I/S�c,r� Gccr G•-i
STABILITY
ENGINEERING INC.
P.O. Box 2646 • Corvallis, Oregon 97339 • p: 541.223.5360 • f: 541.223.5278
October 24,2014
HVAC Inc.
• 5188 SE International Way
Milwaukie,OR 97222
RE: Attachment requirements of new mechanical unit at Fire Station 51 at 8935 SW Burnham St,
Tigard,OR 97223
To whom it concerns:
At your request,we have reviewed the plans for the proposed mechanical unit at the address above and
found the following:
The new mechanical unit(RTU-1)per the plans should be attached to its respective curb with(4) 16 ga.
x 6"long steel brackets. Each bracket should be attached to the mechanical unit with(3)#10 sheet metal
screws and attached to the curb with(3)#10 sheet metal screws. The curb should be attached to the roof
with(12)#10 wood screws @ 12"o.c.(penetration of 2" into wood min.). (3)screws are required on
each side of curb. See sheet 1 of addendum#1 enclosed.
If you have any questions regarding this letter,please call.
Sincerely,
Stability Engineering,Inc.
By:
4�i
Shawn St/ g, .E/.,P incipal,Pr��Engineerineer
'
ye-
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INE; 0
Encl: Addendum#1,Calculations 508 P 04
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1
EXP 6/3o (4
MECHANICAL
UNIT 16 GA. CLIP (INSTALL AS
(BY OTHERS) SPECIFIED IN REPORT)
CURB •10 WOOD SCREW INTO
(BY OTHERS) EXISTING ROOF
(INSTALL AS SPECIFIED
N REPORT)
EXISTING ROOF
EXISTING ROOF
FRAMING
SHAPE MAY VARY DEPENDING
ON MECHANICAL
UNIT TYPE. MANUFACTURE
AS REQUIRED.
v Z7- Z /1
soy f);- ,,
6" LONG 16 GA. CLIP TYPICAL
vitio ;
ts„ ./%
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EXP 6/30 f
ATTACHMENT REQUIREMENTS FOR
MECHANICAL UNIT (RTU-1 )
ADDENDUM#1: MECHANICAL UNIT ATTACHMENT REQUIREMENTS
STABILITY AatS, PROJECT: SCALE:
TUALATIN FIRE
ENGINEERING INC. SEISMIC BRACING STATION 51 -EQUIPMENT
N/A
777 NE 2ND STREET, SUITE 280 LOCATION: sht.
P.O. BOX 2646, CORVALLIS, OR 97339 8IG RD,OR 97223 ST
TIGARD, OR 97223 1
TEL.: (541)223-5360 FAX: (541)223-5278 JOB # 14-0491 I By: CK I DATE: 10/24/14 of 1
TUALATIN FIRE STATION 51
TIGARD, OR
OCTODER 24, 2014
JOB#14-0491
STRUCTURAL CALCULATIONS
BY
STABILITY AgIC
ENGINEERING INC.
P.O. BOX 2646 • CORVALLIS, OREGON 97339
P: 541 .223.5360 F: 541.223-527E3
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EXP 6/30 (
CALCULATIONS 1-3
10/24/2014 Design Maps Summary Report 1
NM Design Maps Summary Report
User-Specified Input
Report Title 14-0491 FIRE STATION 51 (HVAC)
Fri October 24,2014 21:56:44 UTC
Building Code Reference Document SCE 7-10 Standard
(which utilizes USGS hazard data available In 2008)
Site Coordinates 45.42762°N, 122.76831°W
Site Soil Classification Site Class D - "Stiff Soil"
Risk Category I/II/III
5_______ ,„„„.„3„.;,,,„7.16 ..„,..,.„,_:,,.,.
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n
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4L <' 4 y kt
An}t.
USGS-Provided Output
SS = 0.972 g SMS = 1.080 g SDS 0.720 g
S1 = 0.422 g SM1 = 0.666 g SD1 = 0.444 g
For information on how the SS and Si values above have been calculated from probabilistic (risk-targeted) and
deterministic ground motions in the direction of maximum horizontal response, please return to the application and
select the"2009 NEHRP" building code reference document.
MCERResponse Spectrum Design Response Spectrum
0.72
1.10
0.55 0.64
0.22 0.56
0.77
• 0.42
In 0.65 ET
IC 0.55 , ▪ 0.40 f
1,11 0.32
0.44
0.32
0.24
0.22 0.16
0.11 0.08
0.00 0.00
0.00 0.20 0.4D 0.60 D.20 1.00 1.20 1.40 1.60 1.20 2.00 0.00 0.20 0.40 D.6D D.20 1.00 1.20 1.40 1.60 1.90 2.DQ
Period, T(sec)
Period, T(sec)
lease view the detailed report.
For PGAM, T„ CRS, and CR, values, p
http://ehp4 earthquake.cr.usgs.gov/designmaps/us/summary,php?template=minimal&latitude=45.4276208&longitude=-122.7683111&sitedass=3&riskcategory... 1/2
ooese
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7
S
10/24/2014 Project:114-0491-FIRE STATION 51
UNIT: RTU-1 STABILITY AIL
ENGINEERING INC.
By:CK
HVAC Shear and Overturning Forces
ASCE 7-10;13.3:Seismic Force
Wp= 326 lb
ap= 2.5 ASCE 7-10;Table 13.6-1
Sr*= 0.72 g
Rp= 6 ASCE 7-10;Table 13.6-1
Ip= 1.5 ASCE 7-10;13.1.3
z= 1 ft
h= 1 ft
Fp= 0.4apSpsWp(1+2z/h)/(Rp/Ip)(.7)= 123 lb ASCE 7-10;Equation 13.3-1
Maximum Fp= 1.6Sosl0Wp(.7)= 394 lb ASCE 7-10;Equation 13.3-2
Minimum Fp= 0.3SosipWp(.7)= 74 lb ASCE 7-10;Equation 13.3-3
Controlling Fp= 123 lb
J F„,,= 0.2SosWp(•7)= 33 lb ASCE 7-10;133.1
ASCE 7-10;29.5:Wind Force
K.,= 0.62 ASCE 7-10;Table 29.3-1
Kir= 1 ASCE 7-10;26.8.2
Kd= 0.9 ASCE 7-10;Table 26.6-1
V= 130 mph
GC,= 1.9 ASCE 7-10;29.5.1
GCr(ppBg)= . 1.5 ASCE 7-10;29.5.1
Ar= 15.5 sf
At' 10.9 sf Horizontal projected area of equipment
go. 0.00256K=K„KdV2= 24.1 psf ASCE 7-10;Equation 29.3-1
F,,,= 0.6*ghGC,Af= J b /414-51ASCE 7-10;Equation 29.5-2
Fpr 0.6*ghGCrp,pmgAr= 237 lb `r� ,r.¢ ASCE 7-10;Equation 29.5-3
Overturning Force:Seismic and Wind
X= 32.625 in.
Y1= 12 in. T
Y2= 46.125 In.
Wp
CW+FMB=0=Fp(Y1+Y2/2)+Fpv(X/2)-Wp(X/2)-FaX V
Fp orFw
CG Y2
Fa= 51 lb
*
Y2/2 Fpv(for
CW+IMB=0=Fw(Y1+Y2/2)+Fwv(X/2)-Wp(X/2)-FaX seismic only)
Fa= 479 lb Y1 , X/2
Wind forces control �A Fs x 4 g Fs
Controlling Fa= dili lb Fa Fb
/Ilo.jr,