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Prepared For:
PROVENT
3847 Wabash Dr. Mira Loma, CA 91725
951.685.1101
Prepared By:
Lyons Warren Engineers + Architects
9560 Candida Street, San Diego, CA 92126
858.573.8999
Job No.: PRO1204 E1/E2
Effective Date: 20150423
Structural Calculations
Roof Curbs for York Units Sunline 15-25 York Units
ZJ / ZR 180-300: ZF 210-300: XP 180-240
Provent P/N 80-268-1814 & 80-268-1818
Form No: CBKD - 91
4/24/15exp: 2/28/17
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Curb Information
Curb Number:
Hcurb 14 (Height from support structure to top of curb)
Lcurb 122.25 (Length of Curb - In to In)
Wcurb 80 (Width of Curb - In to In)
Lclip 89.125 (min Length in Long dir from end to clip)
# clips Long Side 2 (Shear + Uplift Clips)
# clips short side 2 (Shear Clips)
Unit Information:
Weight: 3350 lbs (Weight of Unit - min weight governs design)
W c-max 1065 lbs (Maximum corner weight)
W c-min 470 lbs (Minimum corner weight)
W mid 323 lbs (load B or E, 6 point load criteria for York curbs)
H unit 53 in (Height of unit above curb)
H cm 26 in (Height from top of curb to center of mass of unit)
L unit 181 in (Length of unit)
w unit 92 in (Width of unit)
Seismic Loading (2014 FBC)
Ss 0.2 (worst case for Florida State)
Fa 2.5 (worst case for site; Ss<0.25, Site Class E)
Sms 0.5 (=Fa*Ss)
Sds 0.33 (=2/3*Sms)
Ip 1.5 (=Worst case)
ap 2.5
Rp 6
Fp max 0.3 Wp (=0.4*ap*Sds*Wp*(1+2*z/h)/(Rp/Ip))
Fp ASD 602 lbs (=0.7*Fpmax)
Wind Loading (2014 FBC)
Wind Exposure: D
V 185 mph (Ultimate Wind Speed - Worst case:
Kzt 1.66
Kd 0.9
Kh 1.31 (Worst Case for 60 foot roof height)
GCf 3.1
qh 171 psf (ASD=0.6W)
F 532 psf (ultimate) F 319 psf (service)
A net/transv. 66 sf
Fwind transv 35065 lbs (ultimate) Fwind trnsv 21039 lbs (service)
A net/long 34 sf
Fwind long 17872 lbs (ultimate) Fwind long 10723 psf (service)
Controlling Lateral Load (Seismic vs. Wind)
Transverse 21039 lbs (ASD)
Long 10723 lbs (ASD)
page 1
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Wind Loading: Uplift (2014 FBC) 29.5-2 (GC=3.1 - FBC2014)
qh 171.5 psf
GCr 1.5
Fv (psf) 257.2 psf (ultimate)
Av 115 sf
Fv 29662 lbs (ultimate) Fv 17797 lbs (ASD: 0.6W)
Curb Loading:
Transverse direction:
OTM: 46132 lb-ft 0.6W: F max - transv * Hcm
M res. 3960 lb-ft 0.6D: 2 * Wcrnmin *0.6* (width curb +4.25")
Net OTM: 42173 lb-ft 0.6D+0.6W: OTM-RM
Max Comp 7761 lbs /side 1.0D+0.6W: (2 x Wcrnmax + (Mot-Mres)/ (width curb +4.25"))
Max Tension 14905 lbs /side 0.6D+0.6W: (Mot-Mres)/(width curb +4.25")) + Fv/(2 sides)
Max Tension 7453 lbs /clip 0.6D+0.6W: Max tension/side /#clips
Max Corner: 1753 lbs W c-max+ (Mot-Mres)/((w/curb+4.25")/Lcurb*(N-corner)/2/12
Max Interior: 1699 lbs W mid+ (Mot-Mres)/(width curb +4.25")/Lcurb*(N-mid)
Longitudinal direction:
OTM: 23513 lb-ft 0.6W: F max long * Hcm
RM 5957 lb-ft 0.6D: 2 X Wcrnmin x (Lcurb+4.25in)/12 x 0.6
Net OTM: 17556 lb-ft 0.6D+0.6W: OTM-RM
Max Comp = 3959 lbs /side 1.0D+0.6W: (2*Wcmax + (NetOTM)/Lclip)+ Fv/(U.C)
Max Tens = 11262 lbs /side 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)
Max Tension = 6813 lbs /clip 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)/#clips/side
Max Corner: 1367 lbs W c-max+ (Mot-Mres)/Lcurb/Wcurb*(N-corner)/2
Connection of Unit to Curb
Screws in Uplift clips (Attach with 1/4 SMS into 14mil) Vall= 933 lbs/screw
Screws in Short Side Clips (Attach with #12 SMS into 14mil) Vall= 870 lbs/screw
UPLIFT CLIPS: UPLIFT CLIPS:
Shear: 2681 lbs/clip 6 1/4" screws/clip
Uplift: 7453 lbs/clip Fdiag/screw 765 lbs/screw
F diag 4590 lbs/clip to curb F/screw outs. 621 lbs/screw
SCREWS OK
SHORTSIDE CLIPS SHORTSIDE CLIPS
Shear: 2681 lbs/clip 4 #12 screws/clip
F screw 670 lbs/screw
SCREWS OK
page 2
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Curb info
H curb 14 in, curb height
Fy 50 ksi
E 29000 ksi
Fu 65 ksi
gage: 14
R 0.1069
t 0.0713
R/t 1.50
h 13.71 in
Interior Curb
N 28 bearing length: 2*h
C 20
CR 0.1
CN 0.08
Ch 0.03
φw 0.85
Ωw 1.75
Pn 6.73 k
Pall 3.85 k
φPn 5.72 k
Pmax 1.70 k Pall>Pmax,curb OK,
Exterior Curb:
N total 28 2*curb height
N -BUS 1 bearing length with stiffener (built up section)
N - SWC 27 bearing length without stiffener (single web channel)
N 27 N 1
C 7.5 C 15.5
CR 0.08 CR 0.09CN 0.12 CN 0.08
Ch 0.05 Ch 0.04
φw 0.85 φw 0.75
Ωw 1.75 Ωw 2
Pn 1.76 k Pn 4.06 k
Pall 1.00 k Pall 2.03 k Pall 3.03 k
φPn 1.49 k φPn 3.04 k φPn 4.54 k
Pmax 1.75 k
Pall>Pmax,curb OK,
Exterior Curb SWC Exterior Curb BUS
Corner:
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Connection of Curb to Supporting Structure (ASD)
Transverse: 0.6D+0.6W
**Uplift (wind)= 18123 lbs
*Uplift (seismic) -277 lbs
Uplift max= 18123 lbs/long side
**Shear (wind) 24830 lbs
*Shear (seis) 602 lbs
Shear max= 24830 lbs/total curb
Longitudinal:
**Uplift (wind)= 13032 lbs
*Uplift (seismic) -530 lbs T max 18123 lbs/long
Uplift max= 13032 lbs/long side V max 24830 lbs/total
**Shear (wind) 13204 lbs
*Shear (seis) 602 lbs
Shear max= 13204 lbs/total curb
Wood Attachment: (Use 5/8" φ x 5" LAG SCREWS) W' 2284.8 lbs
(4" minimum embed into DF or SP wood) Z' 592 lbs
total screws required= 48
# screws: LONG SIDE 12
# screws: SHORT SIDE 12
W/screw (uplift) 1510 lbs
V/Screw 517 lbs
Angle 71.1 deg
Z (at angle) 1596 lbs
Atkinson Formula: Z' (at angle) 1757 lbs
WOOD SCREWS OK
Steel Deck Attach.: (Use 5/8" φ A307 Bolts attached to L5x5x1/4 below deck at each conn.point)
Tall= 6900 lbs
Vall= 3680 lbs
total bolts required= 16
# bolts: LONG SIDE 6
# bolts: SHORT SIDE 2
T/bolt (uplift) 6516 lbs
V/bolt 1552 lbs
fv 5.0 ksi OK
ft 21.0 ksi OK
Fnt' 39.7 ksi
Fnv 24.0 ksi
BOLTS OK
page 4
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Connection of Curb to Concrete Supporting Structure - STRENGTH DESIGN
Transverse: 0.9D +1.0(E or W)
**Uplift (wind)= 30299 lbs
*Uplift (seismic) 1288 lbs *Rp*1.3/1.5/0.7asd
Uplift max= 30299 lbs/side (Per long side curb)
**Shear (wind) 41383 lbs (Maximum Lateral Force) (seismic: Rp=1.5 max)
*Shear (seis) 4472 lbs *Rp*1.3/1.5/0.7asd
Shear max= 41383 lbs (Total Curb)
Longitudinal:
**Uplift (wind)= 21853 lbs
*Uplift (seismic) 820 lbs Tu max 30299 lbs
Uplift max= 21853 lbs/side (Per long side curb) Vu max 41383 lbs
**Shear (wind) 22007 lbs
*Shear (seis) 4472 lbs
Shear max= 22007 lbs (Total Curb)
Concrete Attach.: (Use 5/8"φ Simpson Strong Bolt 2) phi-Tn 2900 lbs
phi-Vn 1200 lbs
(LRFD design)
Anchors Required for Uplift (long side only)= 10.4
Anchors Required for Shear (Total Curb)= 34.5
Anchors Required (long side only) = 11.0
anchors (long side) 12.0 OK
Simpson Strong Bolt 2 anchors (short side) 8.0
3 5/8" Embed anchors (total) 40 OK
(f'c=4000psi, 6" min total thickness - normal weight concrete) Tu 2525 OK
ESR Report - 3037 Vu 1035 OK
Special Inspection Required
*Uplift and Shear seismic anchorage forces have been designed for an Rp of 1.5 max per ASCE 13.4.2
Anchorage design per ASCE 14.2.2.17/ACI D3.3 with strength reduction factors
not required in combination with Rp=1.5
** For wind force, shear at base for anchorage design, accounts for add'l area from curb width and height
page 5
Conc Anchors
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Curb Information
Curb Number:
Hcurb 14 (Height from support structure to top of curb)
Lcurb 122.25 (Length of Curb - In to In)
Wcurb 80 (Width of Curb - In to In)
Lclip 89.125 (min Length in Long dir from end to clip)
# clips Long Side 2 (Shear + Uplift Clips)
# clips short side 2 (Shear Clips)
Unit Information:
Weight: 2006 lbs (Weight of Unit - min weight governs design)
W c-max 534 lbs (Maximum corner weight)
W c-min 470 lbs (Minimum corner weight)
W mid 323 lbs (load B or E, 6 point load criteria for York curbs)
H unit 53 in (Height of unit above curb)
H cm 26 in (Height from top of curb to center of mass of unit)
L unit 181 in (Length of unit)
w unit 92 in (Width of unit)
Seismic Loading (2014 FBC)
Ss 0.2 (worst case for Florida State)
Fa 2.5 (worst case for site; Ss<0.25, Site Class E)
Sms 0.5 (=Fa*Ss)
Sds 0.33 (=2/3*Sms)
Ip 1.5 (=Worst case)
ap 2.5
Rp 6
Fp max 0.3 Wp (=0.4*ap*Sds*Wp*(1+2*z/h)/(Rp/Ip))
Fp ASD 361 lbs (=0.7*Fpmax)
Wind Loading (2014 FBC)
Wind Exposure: D
V 185 mph (Ultimate Wind Speed - Worst case:
Kzt 1.66
Kd 0.9
Kh 1.31 (Worst Case for 60 foot roof height)
GCf 3.1
qh 171 psf (ASD=0.6W)
F 532 psf (ultimate) F 319 psf (service)
A net/transv. 66 sf
Fwind transv 35065 lbs (ultimate) Fwind trnsv 21039 lbs (service)
A net/long 34 sf
Fwind long 17872 lbs (ultimate) Fwind long 10723 psf (service)
Controlling Lateral Load (Seismic vs. Wind)
Transverse 21039 lbs (ASD)
Long 10723 lbs (ASD)
page 1
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Wind Loading: Uplift (2014 FBC) 29.5-2 (GC=3.1 - FBC2014)
qh 171.5 psf
GCr 1.5
Fv (psf) 257.2 psf (ultimate)
Av 115 sf
Fv 29662 lbs (ultimate) Fv 17797 lbs (ASD: 0.6W)
Curb Loading:
Transverse direction:
OTM: 46132 lb-ft 0.6W: F max - transv * Hcm
M res. 3960 lb-ft 0.6D: 2 * Wcrnmin *0.6* (width curb +4.25")
Net OTM: 42173 lb-ft 0.6D+0.6W: OTM-RM
Max Comp 6699 lbs /side 1.0D+0.6W: (2 x Wcrnmax + (Mot-Mres)/ (width curb +4.25"))
Max Tension 14905 lbs /side 0.6D+0.6W: (Mot-Mres)/(width curb +4.25")) + Fv/(2 sides)
Max Tension 7453 lbs /clip 0.6D+0.6W: Max tension/side /#clips
Max Corner: 1222 lbs W c-max+ (Mot-Mres)/((w/curb+4.25")/Lcurb*(N-corner)/2/12
Max Interior: 1699 lbs W mid+ (Mot-Mres)/(width curb +4.25")/Lcurb*(N-mid)
Longitudinal direction:
OTM: 23513 lb-ft 0.6W: F max long * Hcm
RM 5957 lb-ft 0.6D: 2 X Wcrnmin x (Lcurb+4.25in)/12 x 0.6
Net OTM: 17556 lb-ft 0.6D+0.6W: OTM-RM
Max Comp = 2897 lbs /side 1.0D+0.6W: (2*Wcmax + (NetOTM)/Lclip)+ Fv/(U.C)
Max Tens = 11262 lbs /side 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)
Max Tension = 6813 lbs /clip 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)/#clips/side
Max Corner: 836 lbs W c-max+ (Mot-Mres)/Lcurb/Wcurb*(N-corner)/2
Connection of Unit to Curb
Screws in Uplift clips (Attach with 1/4 SMS into 14mil) Vall= 933 lbs/screw
Screws in Short Side Clips (Attach with #12 SMS into 14mil) Vall= 870 lbs/screw
UPLIFT CLIPS: UPLIFT CLIPS:
Shear: 2681 lbs/clip 6 1/4" screws/clip
Uplift: 7453 lbs/clip Fdiag/screw 765 lbs/screw
F diag 4590 lbs/clip to curb F/screw outs. 621 lbs/screw
SCREWS OK
SHORTSIDE CLIPS SHORTSIDE CLIPS
Shear: 2681 lbs/clip 4 #12 screws/clip
F screw 670 lbs/screw
SCREWS OK
page 2
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Curb info
H curb 14 in, curb height
Fy 50 ksi
E 29000 ksi
Fu 65 ksi
gage: 14
R 0.1069
t 0.0713
R/t 1.50
h 13.71 in
Interior Curb
N 28 bearing length: 2*h
C 20
CR 0.1
CN 0.08
Ch 0.03
φw 0.85
Ωw 1.75
Pn 6.73 k
Pall 3.85 k
φPn 5.72 k
Pmax 1.70 k Pall>Pmax,curb OK,
Exterior Curb:
N total 28 2*curb height
N -BUS 1 bearing length with stiffener (built up section)
N - SWC 27 bearing length without stiffener (single web channel)
N 27 N 1
C 7.5 C 15.5
CR 0.08 CR 0.09CN 0.12 CN 0.08
Ch 0.05 Ch 0.04
φw 0.85 φw 0.75
Ωw 1.75 Ωw 2
Pn 1.76 k Pn 4.06 k
Pall 1.00 k Pall 2.03 k Pall 3.03 k
φPn 1.49 k φPn 3.04 k φPn 4.54 k
Pmax 1.22 k
Pall>Pmax,curb OK,
Exterior Curb SWC Exterior Curb BUS
Corner:
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Connection of Curb to Supporting Structure (ASD)
Transverse: 0.6D+0.6W
**Uplift (wind)= 18123 lbs
*Uplift (seismic) -392 lbs
Uplift max= 18123 lbs/long side
**Shear (wind) 24830 lbs
*Shear (seis) 361 lbs
Shear max= 24830 lbs/total curb
Longitudinal:
**Uplift (wind)= 13032 lbs
*Uplift (seismic) -639 lbs T max 18123 lbs/long
Uplift max= 13032 lbs/long side V max 24830 lbs/total
**Shear (wind) 13204 lbs
*Shear (seis) 361 lbs
Shear max= 13204 lbs/total curb
Wood Attachment: (Use 5/8" φ x 5" LAG SCREWS) W' 2284.8 lbs
(4" minimum embed into DF or SP wood) Z' 592 lbs
total screws required= 48
# screws: LONG SIDE 12
# screws: SHORT SIDE 12
W/screw (uplift) 1510 lbs
V/Screw 517 lbs
Angle 71.1 deg
Z (at angle) 1596 lbs
Atkinson Formula: Z' (at angle) 1757 lbs
WOOD SCREWS OK
Steel Deck Attach.: (Use 5/8" φ A307 Bolts attached to L5x5x1/4 below deck at each conn.point)
Tall= 6900 lbs
Vall= 3680 lbs
total bolts required= 16
# bolts: LONG SIDE 6
# bolts: SHORT SIDE 2
T/bolt (uplift) 6516 lbs
V/bolt 1552 lbs
fv 5.0 ksi OK
ft 21.0 ksi OK
Fnt' 39.7 ksi
Fnv 24.0 ksi
BOLTS OK
page 4
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1814 14in curb
Connection of Curb to Concrete Supporting Structure - STRENGTH DESIGN
Transverse: 0.9D +1.0(E or W)
**Uplift (wind)= 30299 lbs
*Uplift (seismic) 432 lbs *Rp*1.3/1.5/0.7asd
Uplift max= 30299 lbs/side (Per long side curb)
**Shear (wind) 41383 lbs (Maximum Lateral Force) (seismic: Rp=1.5 max)
*Shear (seis) 2678 lbs *Rp*1.3/1.5/0.7asd
Shear max= 41383 lbs (Total Curb)
Longitudinal:
**Uplift (wind)= 21853 lbs
*Uplift (seismic) 8 lbs Tu max 30299 lbs
Uplift max= 21853 lbs/side (Per long side curb) Vu max 41383 lbs
**Shear (wind) 22007 lbs
*Shear (seis) 2678 lbs
Shear max= 22007 lbs (Total Curb)
Concrete Attach.: (Use 5/8"φ Simpson Strong Bolt 2) phi-Tn 2900 lbs
phi-Vn 1200 lbs
(LRFD design)
Anchors Required for Uplift (long side only)= 10.4
Anchors Required for Shear (Total Curb)= 34.5
Anchors Required (long side only) = 11.0
anchors (long side) 12.0 OK
Simpson Strong Bolt 2 anchors (short side) 8.0
3 5/8" Embed anchors (total) 40 OK
(f'c=4000psi, 6" min total thickness - normal weight concrete) Tu 2525 OK
ESR Report - 3037 Vu 1035 OK
Special Inspection Required
*Uplift and Shear seismic anchorage forces have been designed for an Rp of 1.5 max per ASCE 13.4.2
Anchorage design per ASCE 14.2.2.17/ACI D3.3 with strength reduction factors
not required in combination with Rp=1.5
** For wind force, shear at base for anchorage design, accounts for add'l area from curb width and height
page 5
Conc Anchors
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Curb Information
Curb Number:
Hcurb 18 (Height from support structure to top of curb)
Lcurb 122.25 (Length of Curb - In to In)
Wcurb 80 (Width of Curb - In to In)
Lclip 89.125 (min Length in Long dir from end to clip)
# clips Long Side 2 (Shear + Uplift Clips)
# clips short side 2 (Shear Clips)
Unit Information:
Weight: 3350 lbs (Weight of Unit - min weight governs design)
W c-max 1065 lbs (Maximum corner weight)
W c-min 470 lbs (Minimum corner weight)
W mid 323 lbs (load B or E, 6 point load criteria for York curbs)
H unit 53 in (Height of unit above curb)
H cm 26 in (Height from top of curb to center of mass of unit)
L unit 181 in (Length of unit)
w unit 92 in (Width of unit)
Seismic Loading (2014 FBC)
Ss 0.2 (worst case for Florida State)
Fa 2.5 (worst case for site; Ss<0.25, Site Class E)
Sms 0.5 (=Fa*Ss)
Sds 0.33 (=2/3*Sms)
Ip 1.5 (=Worst case)
ap 2.5
Rp 6
Fp max 0.3 Wp (=0.4*ap*Sds*Wp*(1+2*z/h)/(Rp/Ip))
Fp ASD 604 lbs (=0.7*Fpmax)
Wind Loading (2014 FBC)
Wind Exposure: D
V 185 mph (Ultimate Wind Speed - Worst case:
Kzt 1.66
Kd 0.9
Kh 1.31 (Worst Case for 60 foot roof height)
GCf 3.1
qh 171 psf (ASD=0.6W)
F 532 psf (ultimate) F 319 psf (service)
A net/transv. 66 sf
Fwind transv 35065 lbs (ultimate) Fwind trnsv 21039 lbs (service)
A net/long 34 sf
Fwind long 17872 lbs (ultimate) Fwind long 10723 psf (service)
Controlling Lateral Load (Seismic vs. Wind)
Transverse 21039 lbs (ASD)
Long 10723 lbs (ASD)
page 1
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Wind Loading: Uplift (2014 FBC) 29.5-2 (GC=3.1 - FBC2014)
qh 171.5 psf
GCr 1.5
Fv (psf) 257.2 psf (ultimate)
Av 115 sf
Fv 29662 lbs (ultimate) Fv 17797 lbs (ASD: 0.6W)
Curb Loading:
Transverse direction:
OTM: 46132 lb-ft 0.6W: F max - transv * Hcm
M res. 3960 lb-ft 0.6D: 2 * Wcrnmin *0.6* (width curb +4.25")
Net OTM: 42173 lb-ft 0.6D+0.6W: OTM-RM
Max Comp 7761 lbs /side 1.0D+0.6W: (2 x Wcrnmax + (Mot-Mres)/ (width curb +4.25"))
Max Tension 14905 lbs /side 0.6D+0.6W: (Mot-Mres)/(width curb +4.25")) + Fv/(2 sides)
Max Tension 7453 lbs /clip 0.6D+0.6W: Max tension/side /#clips
Max Corner: 1949 lbs W c-max+ (Mot-Mres)/((w/curb+4.25")/Lcurb*(N-corner)/2/12
Max Interior: 2092 lbs W mid+ (Mot-Mres)/(width curb +4.25")/Lcurb*(N-mid)
Longitudinal direction:
OTM: 23513 lb-ft 0.6W: F max long * Hcm
RM 5957 lb-ft 0.6D: 2 X Wcrnmin x (Lcurb+4.25in)/12 x 0.6
Net OTM: 17556 lb-ft 0.6D+0.6W: OTM-RM
Max Comp = 3959 lbs /side 1.0D+0.6W: (2*Wcmax + (NetOTM)/Lclip)+ Fv/(U.C)
Max Tens = 11262 lbs /side 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)
Max Tension = 6813 lbs /clip 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)/#clips/side
Max Corner: 1453 lbs W c-max+ (Mot-Mres)/Lcurb/Wcurb*(N-corner)/2
Connection of Unit to Curb
Screws in Uplift clips (Attach with 1/4 SMS into 14mil) Vall= 933 lbs/screw
Screws in Short Side Clips (Attach with #12 SMS into 14mil) Vall= 870 lbs/screw
UPLIFT CLIPS: UPLIFT CLIPS:
Shear: 2681 lbs/clip 6 1/4" screws/clip
Uplift: 7453 lbs/clip Fdiag/screw 765 lbs/screw
F diag 4590 lbs/clip to curb F/screw outs. 621 lbs/screw
SCREWS OK
SHORTSIDE CLIPS SHORTSIDE CLIPS
Shear: 2681 lbs/clip 4 #12 screws/clip
F screw 670 lbs/screw
SCREWS OK
page 2
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Curb info
H curb 18 in, curb height
Fy 50 ksi
E 29000 ksi
Fu 65 ksi
gage: 14
R 0.1069
t 0.0713
R/t 1.50
h 17.71 in
Interior Curb
N 36 bearing length: 2*h
C 20
CR 0.1
CN 0.08
Ch 0.03
φw 0.85
Ωw 1.75
Pn 6.58 k
Pall 3.76 k
φPn 5.59 k
Pmax 2.09 k Pall>Pmax,curb OK,
Exterior Curb:
N total 36 2*curb height
N -BUS 1 bearing length with stiffener (built up section)
N - SWC 35 bearing length without stiffener (single web channel)
N 35 N 1
C 7.5 C 15.5
CR 0.08 CR 0.09CN 0.12 CN 0.08
Ch 0.05 Ch 0.04
φw 0.85 φw 0.75
Ωw 1.75 Ωw 2
Pn 1.33 k Pn 3.37 k
Pall 0.76 k Pall 1.68 k Pall 2.45 k
φPn 1.13 k φPn 2.53 k φPn 3.66 k
Pmax 1.95 k
Pall>Pmax,curb OK,
Exterior Curb SWC Exterior Curb BUS
Corner:
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Connection of Curb to Supporting Structure (ASD)
Transverse: 0.6D+0.6W
**Uplift (wind)= 19164 lbs
*Uplift (seismic) -247 lbs
Uplift max= 19164 lbs/long side
**Shear (wind) 25913 lbs
*Shear (seis) 604 lbs
Shear max= 25913 lbs/total curb
Longitudinal:
**Uplift (wind)= 13609 lbs
*Uplift (seismic) -502 lbs T max 19164 lbs/long
Uplift max= 13609 lbs/long side V max 25913 lbs/total
**Shear (wind) 13913 lbs
*Shear (seis) 604 lbs
Shear max= 13913 lbs/total curb
Wood Attachment: (Use 5/8" φ x 5" LAG SCREWS) W' 2284.8 lbs
(4" minimum embed into DF or SP wood) Z' 592 lbs
total screws required= 48
# screws: LONG SIDE 12
# screws: SHORT SIDE 12
W/screw (uplift) 1597 lbs
V/Screw 540 lbs
Angle 71.3 deg
Z (at angle) 1686 lbs
Atkinson Formula: Z' (at angle) 1767 lbs
WOOD SCREWS OK
Steel Deck Attach.: (Use 5/8" φ A307 Bolts attached to L5x5x1/4 below deck at each conn.point)
Tall= 6900 lbs
Vall= 3680 lbs
total bolts required= 16
# bolts: LONG SIDE 6
# bolts: SHORT SIDE 2
T/bolt (uplift) 6804 lbs
V/bolt 1620 lbs
fv 5.2 ksi OK
ft 21.9 ksi OK
Fnt' 38.9 ksi
Fnv 24.0 ksi
BOLTS OK
page 4
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 Heaviest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Connection of Curb to Concrete Supporting Structure - STRENGTH DESIGN
Transverse: 0.9D +1.0(E or W)
**Uplift (wind)= 32033 lbs
*Uplift (seismic) 1508 lbs *Rp*1.3/1.5/0.7asd
Uplift max= 32033 lbs/side (Per long side curb)
**Shear (wind) 43188 lbs (Maximum Lateral Force) (seismic: Rp=1.5 max)
*Shear (seis) 4488 lbs *Rp*1.3/1.5/0.7asd
Shear max= 43188 lbs (Total Curb)
Longitudinal:
**Uplift (wind)= 22815 lbs
*Uplift (seismic) 1028 lbs Tu max 32033 lbs
Uplift max= 22815 lbs/side (Per long side curb) Vu max 43188 lbs
**Shear (wind) 23188 lbs
*Shear (seis) 4488 lbs
Shear max= 23188 lbs (Total Curb)
Concrete Attach.: (Use 5/8"φ Simpson Strong Bolt 2) phi-Tn 2900 lbs
phi-Vn 1200 lbs
(LRFD design)
Anchors Required for Uplift (long side only)= 11.0
Anchors Required for Shear (Total Curb)= 36.0
Anchors Required (long side only) = 12.0
anchors (long side) 12.0 OK
Simpson Strong Bolt 2 anchors (short side) 8.0
3 5/8" Embed anchors (total) 40 OK
(f'c=4000psi, 6" min total thickness - normal weight concrete) Tu 2669 OK
ESR Report - 3037 Vu 1080 OK
Special Inspection Required
*Uplift and Shear seismic anchorage forces have been designed for an Rp of 1.5 max per ASCE 13.4.2
Anchorage design per ASCE 14.2.2.17/ACI D3.3 with strength reduction factors
not required in combination with Rp=1.5
** For wind force, shear at base for anchorage design, accounts for add'l area from curb width and height
page 5
Conc Anchors
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Curb Information
Curb Number:
Hcurb 18 (Height from support structure to top of curb)
Lcurb 122.25 (Length of Curb - In to In)
Wcurb 80 (Width of Curb - In to In)
Lclip 89.125 (min Length in Long dir from end to clip)
# clips Long Side 2 (Shear + Uplift Clips)
# clips short side 2 (Shear Clips)
Unit Information:
Weight: 2006 lbs (Weight of Unit - min weight governs design)
W c-max 534 lbs (Maximum corner weight)
W c-min 470 lbs (Minimum corner weight)
W mid 323 lbs (load B or E, 6 point load criteria for York curbs)
H unit 53 in (Height of unit above curb)
H cm 26 in (Height from top of curb to center of mass of unit)
L unit 181 in (Length of unit)
w unit 92 in (Width of unit)
Seismic Loading (2014 FBC)
Ss 0.2 (worst case for Florida State)
Fa 2.5 (worst case for site; Ss<0.25, Site Class E)
Sms 0.5 (=Fa*Ss)
Sds 0.33 (=2/3*Sms)
Ip 1.5 (=Worst case)
ap 2.5
Rp 6
Fp max 0.3 Wp (=0.4*ap*Sds*Wp*(1+2*z/h)/(Rp/Ip))
Fp ASD 362 lbs (=0.7*Fpmax)
Wind Loading (2014 FBC)
Wind Exposure: D
V 185 mph (Ultimate Wind Speed - Worst case:
Kzt 1.66
Kd 0.9
Kh 1.31 (Worst Case for 60 foot roof height)
GCf 3.1
qh 171 psf (ASD=0.6W)
F 532 psf (ultimate) F 319 psf (service)
A net/transv. 66 sf
Fwind transv 35065 lbs (ultimate) Fwind trnsv 21039 lbs (service)
A net/long 34 sf
Fwind long 17872 lbs (ultimate) Fwind long 10723 psf (service)
Controlling Lateral Load (Seismic vs. Wind)
Transverse 21039 lbs (ASD)
Long 10723 lbs (ASD)
page 1
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Wind Loading: Uplift (2014 FBC) 29.5-2 (GC=3.1 - FBC2014)
qh 171.5 psf
GCr 1.5
Fv (psf) 257.2 psf (ultimate)
Av 115 sf
Fv 29662 lbs (ultimate) Fv 17797 lbs (ASD: 0.6W)
Curb Loading:
Transverse direction:
OTM: 46132 lb-ft 0.6W: F max - transv * Hcm
M res. 3960 lb-ft 0.6D: 2 * Wcrnmin *0.6* (width curb +4.25")
Net OTM: 42173 lb-ft 0.6D+0.6W: OTM-RM
Max Comp 6699 lbs /side 1.0D+0.6W: (2 x Wcrnmax + (Mot-Mres)/ (width curb +4.25"))
Max Tension 14905 lbs /side 0.6D+0.6W: (Mot-Mres)/(width curb +4.25")) + Fv/(2 sides)
Max Tension 7453 lbs /clip 0.6D+0.6W: Max tension/side /#clips
Max Corner: 1418 lbs W c-max+ (Mot-Mres)/((w/curb+4.25")/Lcurb*(N-corner)/2/12
Max Interior: 2092 lbs W mid+ (Mot-Mres)/(width curb +4.25")/Lcurb*(N-mid)
Longitudinal direction:
OTM: 23513 lb-ft 0.6W: F max long * Hcm
RM 5957 lb-ft 0.6D: 2 X Wcrnmin x (Lcurb+4.25in)/12 x 0.6
Net OTM: 17556 lb-ft 0.6D+0.6W: OTM-RM
Max Comp = 2897 lbs /side 1.0D+0.6W: (2*Wcmax + (NetOTM)/Lclip)+ Fv/(U.C)
Max Tens = 11262 lbs /side 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)
Max Tension = 6813 lbs /clip 0.6D+0.6W: (Mot-Mres)/Lclip) + Fv/(2 sides)/#clips/side
Max Corner: 922 lbs W c-max+ (Mot-Mres)/Lcurb/Wcurb*(N-corner)/2
Connection of Unit to Curb
Screws in Uplift clips (Attach with 1/4 SMS into 14mil) Vall= 933 lbs/screw
Screws in Short Side Clips (Attach with #12 SMS into 14mil) Vall= 870 lbs/screw
UPLIFT CLIPS: UPLIFT CLIPS:
Shear: 2681 lbs/clip 6 1/4" screws/clip
Uplift: 7453 lbs/clip Fdiag/screw 765 lbs/screw
F diag 4590 lbs/clip to curb F/screw outs. 621 lbs/screw
SCREWS OK
SHORTSIDE CLIPS SHORTSIDE CLIPS
Shear: 2681 lbs/clip 4 #12 screws/clip
F screw 670 lbs/screw
SCREWS OK
page 2
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Curb info
H curb 18 in, curb height
Fy 50 ksi
E 29000 ksi
Fu 65 ksi
gage: 14
R 0.1069
t 0.0713
R/t 1.50
h 17.71 in
Interior Curb
N 36 bearing length: 2*h
C 20
CR 0.1
CN 0.08
Ch 0.03
φw 0.85
Ωw 1.75
Pn 6.58 k
Pall 3.76 k
φPn 5.59 k
Pmax 2.09 k Pall>Pmax,curb OK,
Exterior Curb:
N total 36 2*curb height
N -BUS 1 bearing length with stiffener (built up section)
N - SWC 35 bearing length without stiffener (single web channel)
N 35 N 1
C 7.5 C 15.5
CR 0.08 CR 0.09CN 0.12 CN 0.08
Ch 0.05 Ch 0.04
φw 0.85 φw 0.75
Ωw 1.75 Ωw 2
Pn 1.33 k Pn 3.37 k
Pall 0.76 k Pall 1.68 k Pall 2.45 k
φPn 1.13 k φPn 2.53 k φPn 3.66 k
Pmax 1.42 k
Pall>Pmax,curb OK,
Exterior Curb SWC Exterior Curb BUS
Corner:
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Connection of Curb to Supporting Structure (ASD)
Transverse: 0.6D+0.6W
**Uplift (wind)= 19164 lbs
*Uplift (seismic) -374 lbs
Uplift max= 19164 lbs/long side
**Shear (wind) 25913 lbs
*Shear (seis) 362 lbs
Shear max= 25913 lbs/total curb
Longitudinal:
**Uplift (wind)= 13609 lbs
*Uplift (seismic) -622 lbs T max 19164 lbs/long
Uplift max= 13609 lbs/long side V max 25913 lbs/total
**Shear (wind) 13913 lbs
*Shear (seis) 362 lbs
Shear max= 13913 lbs/total curb
Wood Attachment: (Use 5/8" φ x 5" LAG SCREWS) W' 2284.8 lbs
(4" minimum embed into DF or SP wood) Z' 592 lbs
total screws required= 48
# screws: LONG SIDE 12
# screws: SHORT SIDE 12
W/screw (uplift) 1597 lbs
V/Screw 540 lbs
Angle 71.3 deg
Z (at angle) 1686 lbs
Atkinson Formula: Z' (at angle) 1767 lbs
WOOD SCREWS OK
Steel Deck Attach.: (Use 5/8" φ A307 Bolts attached to L5x5x1/4 below deck at each conn.point)
Tall= 6900 lbs
Vall= 3680 lbs
total bolts required= 16
# bolts: LONG SIDE 6
# bolts: SHORT SIDE 2
T/bolt (uplift) 6804 lbs
V/bolt 1620 lbs
fv 5.2 ksi OK
ft 21.9 ksi OK
Fnt' 38.9 ksi
Fnv 24.0 ksi
BOLTS OK
page 4
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999
HVAC UNIT: Sunline 15-25 lightest
PROVENT STEEL CURB DESIGN
PROVENT PART NUMBER:80-268-1818 18in curb
Connection of Curb to Concrete Supporting Structure - STRENGTH DESIGN
Transverse: 0.9D +1.0(E or W)
**Uplift (wind)= 32033 lbs
*Uplift (seismic) 563 lbs *Rp*1.3/1.5/0.7asd
Uplift max= 32033 lbs/side (Per long side curb)
**Shear (wind) 43188 lbs (Maximum Lateral Force) (seismic: Rp=1.5 max)
*Shear (seis) 2688 lbs *Rp*1.3/1.5/0.7asd
Shear max= 43188 lbs (Total Curb)
Longitudinal:
**Uplift (wind)= 22815 lbs
*Uplift (seismic) 133 lbs Tu max 32033 lbs
Uplift max= 22815 lbs/side (Per long side curb) Vu max 43188 lbs
**Shear (wind) 23188 lbs
*Shear (seis) 2688 lbs
Shear max= 23188 lbs (Total Curb)
Concrete Attach.: (Use 5/8"φ Simpson Strong Bolt 2) phi-Tn 2900 lbs
phi-Vn 1200 lbs
(LRFD design)
Anchors Required for Uplift (long side only)= 11.0
Anchors Required for Shear (Total Curb)= 36.0
Anchors Required (long side only) = 12.0
anchors (long side) 12.0 OK
Simpson Strong Bolt 2 anchors (short side) 8.0
3 5/8" Embed anchors (total) 40 OK
(f'c=4000psi, 6" min total thickness - normal weight concrete) Tu 2669 OK
ESR Report - 3037 Vu 1080 OK
Special Inspection Required
*Uplift and Shear seismic anchorage forces have been designed for an Rp of 1.5 max per ASCE 13.4.2
Anchorage design per ASCE 14.2.2.17/ACI D3.3 with strength reduction factors
not required in combination with Rp=1.5
** For wind force, shear at base for anchorage design, accounts for add'l area from curb width and height
page 5
Conc Anchors
Lyons Warren
Engineers Architects
9580 Candida Street
San Diego, CA 92126 (858) 573-8999