Plans (379) STABILITY
ENGINEERING
P.O. Box 2646 • Corvallis, Oregon 97339 • p: 541.223.5360 f: 541.223.5278
August 8, 2018
North Pacific Mechanical
1815 NW 169th Place,suite 2100
Beaverton, OR 97006
RE: Attachment requirements of the new replacement AC unit at Carl's Jr. 7127 in.Tigard,OR
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 replacement AC unit (ZF150) per the plans should be attached to its respective curb
adapter with (6) 14 ga. x 6"long steel brackets. One bracket is required at each corner of the
curb adapter with an additional bracket spaced evenly along each long edge of the curb
adapter. Each bracket should be attached to the mechanical unit with (4) #10 sheet metal
screws and attached to the curb adapter with (4) #10 sheet metal screws. The curb adapter
should be,attached to the existing curb with (6) 14 ga. x 6" long steel brackets. One bracket is
required at each corner of the existing curb with an additional bracket spaced evenly along
each long edge of the existing curb. Each bracket should be attached to the curb adapter with
(4) #10 sheet metal screws and attached to the existingcurb with (4) #10 sheet metal`screws.
If you have any questions regarding this letter, please contact us.
Sincerely, q �4 2.
Stability Engineering, Inc. c. I Qp '
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By:
Shawn St eberg, P.E., Principa , Project ngirker
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Encl: Addendum #1, Calculations ,/ G'k�.4 .:,+ `•"' . , C ' .
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MECHANICAL
UNIT METAL CLIP(INSTALL AS
(BY OTHERS) SPECIFIED IN REPORT)
ADAPTER CURB
(BY OTHERS)
METAL CLIP(INSTALL AS
7 SPECIFIED IN REPORT)
EXISTING CURB 1 EXISTING CURB
(BY OTHERS) ATTACHMENT TO
ROOF FRAMING
EXISTING ROOF
FRAMING
SHAPE MAY VARY DEPENDING
ON MECHANICAL
UNIT TYPE. MANUFACTURE
AS REQUIRED.
08/08/2018
6" LONG 14 GA. CLIP TYPICAL 0,Z - ` -,-,
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ATTACHMENT REQUIREMENTS ,
FOR THE REPLACEMENT AC UNIT ��
ExPiqS.6/301_,
,
ADDENDUM #1: MECHANICAL UNIT ATTACHMENT REQT'S
STABILITY AL PROJECT: SCALE:
ENGINEERING INC. CARL'S JR. -REPLACEMENT AC UNIT N/A
777 NE 2ND STREET, SUITE 280 LOCATION: sht.
P.O. BOX 2646, CORVALLIS, OR 97339 15520 PACIFIC HWY 1
TIGARD, OR 97224
TEL.: (541)223-5360 FAX: (541)223-5278 JOB # 18-0484 I By: PS I DATE: AUGUST 8, 2018 of 1
CARL'S JR. - REPLACEMENT
AC UNIT
15520 PACIFIC HWY
TIGARD, OR 97224
AUGUST 8, 2018
JOB#18-0484
STRUCTURAL CALCULATIONS
BY
STABILITY \
ENGINEERINGINC.
P.O. BOX 2646 • CORVALLIS, OREGON 97339
P: 541.223.5360 F: 541 .223-5278
INFO@STABILITYENGINEERS.COM
08/08/2018
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LATERAL CALCULATIONS 1-3
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8/8/2018 Project: 18-0484 CARLS JR.(HVAC)
STABILITY
ENGINEERING INC.
Mechanical Units:REPLACEMENT AC By:Paul Schroeder
HVAC Shear and Overturning Forces
ASCE 7-10;13.3:Seismic Force
W9= 1448 lb
ap= 2.5 ASCE 7-10;Table 13.6-1
SDS= 0.712 g
RP= 6 ASCE 7-10;Table 13.6-1
IP= 1 ASCE 7-10;13.1.3
z= 1 ft
h= 1 ft
Fp= 0.4a9S0sWp(1+2z/h)/(Rp/Ip)(.7)= 361 lb ASCE 7-10;Equation 13.3-1
Maximum F„= 1.65psIPWP(.7)= 1155 lb ASCE 7-10;Equation 13.3-2
Minimum Fp= 0.3Sbsl9Wp(.7)= 217 lb ASCE 7-10;Equation 13.3-3
Controlling Fp= 361 lb
FP„= 0.2SosWP(.7)= 144 lb ASCE 7-10;13.3.1
ASCE 7-10;29.5:Wind Force
K,= 0.62 ASCE 7-10;Table 29.3-1
Ka= 1 ASCE 7-10;26.8.2
Kd= 0.9 ASCE 7-10;Table 26.6-1
V= 120 mph '
GC,= 1.9 ASCE 7-10;29.5.1
GCrluppftl= 1.5 ASCE 7-10;29.5.1
Ar= 42.5 sf
A,= 49.2 sf Horizontal projected area of equipment
chi= 0.00256KZKaKdV2= 20.6 psf ASCE 7-10;Equation 29.3-1
FW= (.6)ghGC,Af=. 999 ' ' ( ( e. ASCE 7-10;Equation 29.5-2
F,w= (.6)ghGCrf„0f0A,= 911 lb ASCE 7-10;Equation 29,5-3
Overturning Force:Seismic and Wind
X= 59 in. T
Y1= 24 In.
Y2= 51 in. Wp
CW+FMB=0=Fp(Y1+Y2/2)+Fpv(X/2)-Wp(X/2)-FaX
Fp or Fw j , tf!CG Y2
Fa= -59 lb
Y212 Fpv(for
CW+IMB=0= Fw(Y1+Y2/2)+Fwv(X/2)-Wp(X/2)-FaX seismic only)
i
Fa= 857 lb Y1' ). X/2
Wind forces control FA Fs X 4 g Fs
Fa Fb
Controlling Fa= 857 Ib up(f f I—