for Ice Loads Due to Freezing Rain on W, M, S, and HP ShapesJob Name: Subject: II
Job No: Originator: Checker: IIIIV
Input Data: ######
Member Size = W18X71 ###Building Classification = II Table 1-1, page 3 ###
Nominal Ice Thickness, ti = 0.250 in. Figures 10-2 through 10-6, pages 104-108 ###Topographic Factor, Kzt = 1.00 Section 6.5.7 & Figure 6-4 ###Height Above Ground, z = 41.01 ft. ###
tf=0.81 W40X362
W40X324
W40X297
W40X277
Dc=20.02 W40X249
Results: d=18.5 W40X215
tw=0.495 W40X199
Member Properties for W18X71: W40X392
Depth, d = 18.50 in. W40X331
Web Thickness, tw = 0.495 in. bf=7.64 W40X327
Flange Width, bf = 7.64 in. W40X294
Flange Thickness, tf = 0.810 in. W40X278
W40X264
Design Parameters: 1.00 Table 10-1 W40X211
Ice Height Factor, fz = 1.0220 If 0 < z <= 900, then fz = (z/33)^(0.10), else fz = 1.4 W40X183
Design Ice Thickness, td = 0.511 in. W40X167
56.00 pcf W40X149
Weight of Ice (for td), Wi = 2.38 psf W36X800
W36X652
Ice Load Based on Circumsribing Diameter of Member per Code: W36X529
Circumscribing Dia., Dc = 20.02 in. Dc = SQRT(d^2+bf^2) W36X487
Area of Ice (for td), Ai = 32.95 in.^2 W36X441
Unif. Distributed Ice Load, wi = 12.81 plf W36X395
W36X361
Ice Load Based on Perimeter of Member: (for comparison purposes) W36X330
Perimeter, Pm = 68.61 in. Pm = 2*((d+td)+2*(bf+td)-(tw+td)) W36X302
Unif. Distributed Ice Load, wi = 13.63 plf wi = (Pm/12)*Wi W36X282
W36X262
W36X247
W36X231
W36X256
W36X232
W36X210
W36X194
W36X182
W36X170
W36X160
W36X150
W36X135
W33X387
W33X354
W33X318
Importance Factor, Ii =
td = 2.0*ti*Ii*fz*(Kzt)^(0.35)Density of Ice, Id = Id = density of ice (assumed = 56 pcf)
Wi = (td/12)*Id
Ai = p*td*(Dc+td)wi = (Ai/144)*Id
Nomenclature
C10
TABLE 1-1 Occupancy Category of Buildings and Other Structures for Flood, Wind, Snow, Earthquake, and Ice Loads Nature of Occupancy Occupancy Category Buildings and structures that represent a low hazard to human life in the event of failure including, I but not limited to: - Agriculture facilities - Certain temporary facilities - Minor storage facilities Buildings and other structures except those listed in Categories I, III and IV II Buildings and other structures that represent a substantial hazard to human life in the event of III failure including, but not limited to: - Buildings and other structures where more than 300 people congregate in one area - Buildings and other structures with day-care facilities with capacity greater than 150 - Elementary or secondary school facilities with capacity greater than 250 - Colleges & adult education facilities with a capacity greater than 500 - Health care facilities with a capacity greater than 50 resident patients but not having surgery or emergency treatment facilities - Jails and detention facilities Buildings and other structures, not includes in Occupancy Category IV, with potential to cause substantial economic impact and/or mass disruption of day-to-day civilian life in event of failure, including, but not limited to: - Power generating stations, water treatment facilities, sewage treatment facilities, and telecommunication centers - Buildings and structures not included in Category IV containing sufficient quantities of toxic, explosive, or other hazardous materials dangerous to the public if released Buildings and other structures designated as essential facilities including, but not limited to: IV - Hospitals and health care facilities having surgery or emergency treatment facilities - Fire, rescue and police stations and emergency vehicle garages - Designated earthquake, hurricane or other emergency shelters - Designated emergency preparedness, communication, and operation centers and other facilities required for emergency response - Power-generating stations and other public utility facilities required in an emergency - Ancillary structures required foroperation of Category IV structures during an emergency - Aviation control towers, air traffic control centers and emergency aircraft hangars - Water storage facilities and pump structures required to maintain water pressure for fire suppression - Buildings and other structures having critical national defense functions - Buildings and structures containing extremelyhazardous materials where quantity of material exceeds a threshhold quantity established by authority having jurisdiction
C12
The Topographic Factor, Kzt, accounts for effect of wind speed-up over isolated hills and escarpments (Sect. 6.5.7 and Fig. 6-4). Kzt = (1+K1*K2*K3)^2 (Eq. 6-3), where: H = height of hill or escarpment relative to the upwind terrain, in feet. Lh = Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet. K1 = factor to account for shape of topographic feature and maximum speed-up effect. K2 = factor to account for reduction in speed-up with distance upwind or downwind of crest. K3 = factor to account for reduction in speed-up with height above local terrain. x = distance (upwind or downwind) from the crest to the building site, in feet. z = height above local ground level, in feet. The effect of wind speed-up shall not be required to be considered (Kzt = 1.0) when H/Lh < 0.2, or H < 15' for Exposures 'C' and 'D', or H < 60' for Exposure 'B'.
C28
TABLE 10-1 IMPORTANCE FACTOR, I, (ICE LOADS) Category* I I 0.80 II 1.00 III 1.25 IV 1.25 *See Section 1.5 and Table 1-1.
for Ice Loads Due to Freezing Rain on C and MC ShapesJob Name: Subject: II
Job No: Originator: Checker: IIIIV
Input Data: ######
Member Size = C12X20.7 ###Building Classification = II Table 1-1, page 3 ###
Nominal Ice Thickness, ti = 0.250 in. Figures 10-2 through 10-6, pages 104-108 ###Topographic Factor, Kzt = 1.00 Section 6.5.7 & Figure 6-4 ###Height Above Ground, z = 41.01 ft. ###
C10X15.3
C9X20
C9X15
C9X13.4
tf=0.501 Dc=12.35 C8X18.7
Results: d=12 C8X13.7
tw=0.282 C8X11.5
Member Properties for C12X20.7: C7X14.7
Depth, d = 12.00 in. C7X12.2
Web Thickness, tw = 0.282 in. bf=2.94 C7X9.8
Flange Width, bf = 2.94 in. C6X13
Flange Thickness, tf = 0.501 in. C6X10.5
C6X8.2
Design Parameters: 1.00 Table 10-1 C5X6.7
Ice Height Factor, fz = 1.0220 If 0 < z <= 900, then fz = (z/33)^(0.10), else fz = 1.4 C4X7.2
Design Ice Thickness, td = 0.511 in. C4X5.4
56.00 pcf C4X4.5
Weight of Ice (for td), Wi = 2.38 psf C3X6
C3X5
Ice Load Based on Circumsribing Diameter of Member per Code: C3X4.1
Circumscribing Dia., Dc = 12.35 in. Dc = SQRT(d^2+bf^2) C3X3.5
Area of Ice (for td), Ai = 20.65 in.^2 MC18X58
Unif. Distributed Ice Load, wi = 8.03 plf MC18X51.9
MC18X45.8
Ice Load Based on Perimeter of Member: (for comparison purposes) MC18X42.7
Perimeter, Pm = 37.24 in. Pm = 2*((d+td)+2*(bf+td)-(tw+td)) MC13X50
Unif. Distributed Ice Load, wi = 7.40 plf wi = (Pm/12)*Wi MC13X40
MC13X35
MC13X31.8
MC12X50
MC12X45
MC12X40
MC12X35
MC12X31
MC12X10.6
MC10X41.1
MC10X33.6
MC10X28.5
MC10X25
MC10X22
MC10X8.4
MC10X6.5
Importance Factor, Ii =
td = 2.0*ti*Ii*fz*(Kzt)^(0.35)Density of Ice, Id = Id = density of ice (assumed = 56 pcf)
Wi = (td/12)*Id
Ai = p*td*(Dc+td)wi = (Ai/144)*Id
Nomenclature
C10
TABLE 1-1 Occupancy Category of Buildings and Other Structures for Flood, Wind, Snow, Earthquake, and Ice Loads Nature of Occupancy Occupancy Category Buildings and structures that represent a low hazard to human life in the event of failure including, I but not limited to: - Agriculture facilities - Certain temporary facilities - Minor storage facilities Buildings and other structures except those listed in Categories I, III and IV II Buildings and other structures that represent a substantial hazard to human life in the event of III failure including, but not limited to: - Buildings and other structures where more than 300 people congregate in one area - Buildings and other structures with day-care facilities with capacity greater than 150 - Elementary or secondary school facilities with capacity greater than 250 - Colleges & adult education facilities with a capacity greater than 500 - Health care facilities with a capacity greater than 50 resident patients but not having surgery or emergency treatment facilities - Jails and detention facilities Buildings and other structures, not includes in Occupancy Category IV, with potential to cause substantial economic impact and/or mass disruption of day-to-day civilian life in event of failure, including, but not limited to: - Power generating stations, water treatment facilities, sewage treatment facilities, and telecommunication centers - Buildings and structures not included in Category IV containing sufficient quantities of toxic, explosive, or other hazardous materials dangerous to the public if released Buildings and other structures designated as essential facilities including, but not limited to: IV - Hospitals and health care facilities having surgery or emergency treatment facilities - Fire, rescue and police stations and emergency vehicle garages - Designated earthquake, hurricane or other emergency shelters - Designated emergency preparedness, communication, and operation centers and other facilities required for emergency response - Power-generating stations and other public utility facilities required in an emergency - Ancillary structures required foroperation of Category IV structures during an emergency - Aviation control towers, air traffic control centers and emergency aircraft hangars - Water storage facilities and pump structures required to maintain water pressure for fire suppression - Buildings and other structures having critical national defense functions - Buildings and structures containing extremelyhazardous materials where quantity of material exceeds a threshhold quantity established by authority having jurisdiction
C12
The Topographic Factor, Kzt, accounts for effect of wind speed-up over isolated hills and escarpments (Sect. 6.5.7 and Fig. 6-4). Kzt = (1+K1*K2*K3)^2 (Eq. 6-3), where: H = height of hill or escarpment relative to the upwind terrain, in feet. Lh = Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet. K1 = factor to account for shape of topographic feature and maximum speed-up effect. K2 = factor to account for reduction in speed-up with distance upwind or downwind of crest. K3 = factor to account for reduction in speed-up with height above local terrain. x = distance (upwind or downwind) from the crest to the building site, in feet. z = height above local ground level, in feet. The effect of wind speed-up shall not be required to be considered (Kzt = 1.0) when H/Lh < 0.2, or H < 15' for Exposures 'C' and 'D', or H < 60' for Exposure 'B'.
C28
TABLE 10-1 IMPORTANCE FACTOR, I, (ICE LOADS) Category* I I 0.80 II 1.00 III 1.25 IV 1.25 *See Section 1.5 and Table 1-1.
for Ice Loads Due to Freezing Rain on WT, MT, and ST Shapes Job Name: Subject: II
Job No: Originator: Checker: IIIIV
Input Data: ######
Member Size = WT7X365 ###Building Classification = II Table 1-1, page 3 ###
Nominal Ice Thickness, t = 0.250 in. Figures 10-2 through 10-6, pages 104-108 ###Topographic Factor, Kzt = 1.00 Section 6.5.7 & Figure 6-4 ###Height Above Ground, z = 41.01 ft. ###
bf=17.9 WT20X181
tf=4.91 WT20X162
WT20X148.5
WT20X138.5
WT20X124.5
Results: WT20X107.5
d=11.2 Dc=21.12 WT20X99.5
Member Properties for WT7X365: tw=3.07 WT20X196
Depth, d = 11.20 in. WT20X165.5
Web Thickness, tw = 3.070 in. WT20X163.5
Flange Width, bf = 17.90 in. WT20X147
Flange Thickness, tf = 4.910 in. WT20X139
WT20X132
Design Parameters: 1.00 Table 10-1 WT20X105.5
Ice Height Factor, fz = 1.0220 If 0 < z <= 900, then fz = (z/33)^(0.10), else fz = 1.4 WT20X91.5
Design Ice Thickness, td = 0.511 in. WT20X83.5
56.00 pcf WT20X74.5
Weight of Ice (for td), Wi = 2.38 psf WT18X400
WT18X326
Ice Load Based on Circumsribing Diameter of Member per Code: WT18X264.5
Circumscribing Dia., Dc = 21.12 in. Dc = SQRT(d^2+bf^2) WT18X243.5
Area of Ice (for td), Ai = 34.72 in.^2 WT18X220.5
Unif. Distributed Ice Load, wi = 13.50 plf WT18X197.5
WT18X180.5
Ice Load Based on Perimeter of Member: (for comparison purposes) WT18X165
Perimeter, Pm = 60.24 in. Pm = 2*((d+td)+(bf+td)) WT18X151
Unif. Distributed Ice Load, wi = 11.97 plf wi = (Pm/12)*Wi WT18X141
WT18X131
WT18X123.5
WT18X116
WT18X128
WT18X115.5
WT18X105
WT18X97
WT18X91
WT18X85
WT18X80
WT18X75
WT18X67.5
WT16.5X193.5
WT16.5X177
WT16.5X159
Importance Factor, Ii =
td = 2.0*t*Ii*fz*(Kzt)^(0.35)Density of Ice, Id = Id = density of ice (assumed = 56 pcf)
Wi = (td/12)*Id
Ai = p*td*(Dc+td)wi = (Ai/144)*Id
Nomenclature
C10
TABLE 1-1 Occupancy Category of Buildings and Other Structures for Flood, Wind, Snow, Earthquake, and Ice Loads Nature of Occupancy Occupancy Category Buildings and structures that represent a low hazard to human life in the event of failure including, I but not limited to: - Agriculture facilities - Certain temporary facilities - Minor storage facilities Buildings and other structures except those listed in Categories I, III and IV II Buildings and other structures that represent a substantial hazard to human life in the event of III failure including, but not limited to: - Buildings and other structures where more than 300 people congregate in one area - Buildings and other structures with day-care facilities with capacity greater than 150 - Elementary or secondary school facilities with capacity greater than 250 - Colleges & adult education facilities with a capacity greater than 500 - Health care facilities with a capacity greater than 50 resident patients but not having surgery or emergency treatment facilities - Jails and detention facilities Buildings and other structures, not includes in Occupancy Category IV, with potential to cause substantial economic impact and/or mass disruption of day-to-day civilian life in event of failure, including, but not limited to: - Power generating stations, water treatment facilities, sewage treatment facilities, and telecommunication centers - Buildings and structures not included in Category IV containing sufficient quantities of toxic, explosive, or other hazardous materials dangerous to the public if released Buildings and other structures designated as essential facilities including, but not limited to: IV - Hospitals and health care facilities having surgery or emergency treatment facilities - Fire, rescue and police stations and emergency vehicle garages - Designated earthquake, hurricane or other emergency shelters - Designated emergency preparedness, communication, and operation centers and other facilities required for emergency response - Power-generating stations and other public utility facilities required in an emergency - Ancillary structures required foroperation of Category IV structures during an emergency - Aviation control towers, air traffic control centers and emergency aircraft hangars - Water storage facilities and pump structures required to maintain water pressure for fire suppression - Buildings and other structures having critical national defense functions - Buildings and structures containing extremelyhazardous materials where quantity of material exceeds a threshhold quantity established by authority having jurisdiction
C12
The Topographic Factor, Kzt, accounts for effect of wind speed-up over isolated hills and escarpments (Sect. 6.5.7 and Fig. 6-4). Kzt = (1+K1*K2*K3)^2 (Eq. 6-3), where: H = height of hill or escarpment relative to the upwind terrain, in feet. Lh = Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet. K1 = factor to account for shape of topographic feature and maximum speed-up effect. K2 = factor to account for reduction in speed-up with distance upwind or downwind of crest. K3 = factor to account for reduction in speed-up with height above local terrain. x = distance (upwind or downwind) from the crest to the building site, in feet. z = height above local ground level, in feet. The effect of wind speed-up shall not be required to be considered (Kzt = 1.0) when H/Lh < 0.2, or H < 15' for Exposures 'C' and 'D', or H < 60' for Exposure 'B'.
C28
TABLE 10-1 IMPORTANCE FACTOR, I, (ICE LOADS) Category* I I 0.80 II 1.00 III 1.25 IV 1.25 *See Section 1.5 and Table 1-1.
for Ice Loads Due to Freezing Rain on Single Angle ShapesJob Name: Subject: II
Job No: Originator: Checker: IIIIV
Input Data: ######
Member Size = L8X6X1/2 ###Building Classification = II Table 1-1, page 3 ###
Nominal Ice Thickness, t = 0.250 in. Figures 10-2 through 10-6, pages 104-108 ###Topographic Factor, Kzt = 1.00 Section 6.5.7 & Figure 6-4 ###Height Above Ground, z = 41.01 ft. ###
L8X6X3/4
L8X6X5/8
L8X6X9/16
Dc=10 L8X6X1/2
d=8 L8X6X7/16
Results: t=0.5 L8X4X1
L8X4X7/8
Member Properties for L8X6X1/2: L8X4X3/4
Leg Depth, d = 8.00 in. b=6 L8X4X5/8
Leg Width, b = 6.00 in. L8X4X9/16
Leg Thickness, t = 0.5000 in. L8X4X1/2
L8X4X7/16
Design Parameters: L7X4X3/4
1.00 Table 10-1 Ice Height Factor, fz = 1.0220 If 0 < z <= 900, then fz = (z/33)^(0.10), else fz = 1.4 L7X4X1/2
Design Ice Thickness, td = 0.511 in. L7X4X7/16
56.00 pcf L7X4X3/8
Weight of Ice (for td), Wi = 2.38 psf L6X6X1
L6X6X7/8
Ice Load Based on Circumsribing Diameter of Member per Code: L6X6X3/4
Circumscribing Dia., Dc = 10.00 in. Dc = SQRT(d^2+b^2) L6X6X5/8
Area of Ice (for td), Ai = 16.87 in.^2 L6X6X9/16
Unif. Distributed Ice Load, wi = 6.56 plf L6X6X1/2
L6X6X7/16
Ice Load Based on Perimeter of Member: (for comparison purposes) L6X6X3/8
Perimeter, Pm = 30.04 in. Pm = 2*((d+td)+(b+td)) L6X6X5/16
Unif. Distributed Ice Load, wi = 5.97 plf wi = (Pm/12)*Wi L6X4X7/8
L6X4X3/4
L6X4X5/8
L6X4X9/16
L6X4X1/2
L6X4X7/16
L6X4X3/8
L6X4X5/16
L6X3-1/2X1/2
L6X3-1/2X3/8
L6X3-1/2X5/16
L5X5X7/8
L5X5X3/4
L5X5X5/8
L5X5X1/2
L5X5X7/16
L5X5X3/8
Importance Factor, Ii =
td = 2.0*t*Ii*fz*(Kzt)^(0.35)Density of Ice, Id = Id = density of ice (assumed = 56 pcf)
Wi = (td/12)*Id
Ai = p*td*(Dc+td)wi = (Ai/144)*Id
Nomenclature
C10
TABLE 1-1 Occupancy Category of Buildings and Other Structures for Flood, Wind, Snow, Earthquake, and Ice Loads Nature of Occupancy Occupancy Category Buildings and structures that represent a low hazard to human life in the event of failure including, I but not limited to: - Agriculture facilities - Certain temporary facilities - Minor storage facilities Buildings and other structures except those listed in Categories I, III and IV II Buildings and other structures that represent a substantial hazard to human life in the event of III failure including, but not limited to: - Buildings and other structures where more than 300 people congregate in one area - Buildings and other structures with day-care facilities with capacity greater than 150 - Elementary or secondary school facilities with capacity greater than 250 - Colleges & adult education facilities with a capacity greater than 500 - Health care facilities with a capacity greater than 50 resident patients but not having surgery or emergency treatment facilities - Jails and detention facilities Buildings and other structures, not includes in Occupancy Category IV, with potential to cause substantial economic impact and/or mass disruption of day-to-day civilian life in event of failure, including, but not limited to: - Power generating stations, water treatment facilities, sewage treatment facilities, and telecommunication centers - Buildings and structures not included in Category IV containing sufficient quantities of toxic, explosive, or other hazardous materials dangerous to the public if released Buildings and other structures designated as essential facilities including, but not limited to: IV - Hospitals and health care facilities having surgery or emergency treatment facilities - Fire, rescue and police stations and emergency vehicle garages - Designated earthquake, hurricane or other emergency shelters - Designated emergency preparedness, communication, and operation centers and other facilities required for emergency response - Power-generating stations and other public utility facilities required in an emergency - Ancillary structures required foroperation of Category IV structures during an emergency - Aviation control towers, air traffic control centers and emergency aircraft hangars - Water storage facilities and pump structures required to maintain water pressure for fire suppression - Buildings and other structures having critical national defense functions - Buildings and structures containing extremelyhazardous materials where quantity of material exceeds a threshhold quantity established by authority having jurisdiction
C12
The Topographic Factor, Kzt, accounts for effect of wind speed-up over isolated hills and escarpments (Sect. 6.5.7 and Fig. 6-4). Kzt = (1+K1*K2*K3)^2 (Eq. 6-3), where: H = height of hill or escarpment relative to the upwind terrain, in feet. Lh = Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet. K1 = factor to account for shape of topographic feature and maximum speed-up effect. K2 = factor to account for reduction in speed-up with distance upwind or downwind of crest. K3 = factor to account for reduction in speed-up with height above local terrain. x = distance (upwind or downwind) from the crest to the building site, in feet. z = height above local ground level, in feet. The effect of wind speed-up shall not be required to be considered (Kzt = 1.0) when H/Lh < 0.2, or H < 15' for Exposures 'C' and 'D', or H < 60' for Exposure 'B'.
C27
TABLE 10-1 IMPORTANCE FACTOR, I, (ICE LOADS) Category* I I 0.80 II 1.00 III 1.25 IV 1.25 *See Section 1.5 and Table 1-1.
for Ice Loads Due to Freezing Rain on Rectangular and Square HSSJob Name: Subject: II
Job No: Originator: Checker: IIIIV
Input Data: ######
Member Size = HSS8X6X5/16 ###Building Classification = II Table 1-1, page 3 ###
Nominal Ice Thickness, ti = 0.250 in. Figures 10-2 through 10-6, pages 104-108 ###Topographic Factor, Kzt = 1.00 Section 6.5.7 & Figure 6-4 ###Height Above Ground, z = 41.01 ft. ###
Note: outside radius of HSS at corners = 2.25*tHSS20X4X5/16
t=0.3125 HSS20X4X1/4
Dc=9.46 HSS18X6X5/8
HSS18X6X1/2
Results: HSS18X6X3/8
H=8 HSS18X6X5/16
Member Properties for HSS8X6X5/16: t=0.3125 HSS18X6X1/4
Depth, h = 8.00 in. HSS16X16X5/8
Width, b = 6.00 in. HSS16X16X1/2
Nominal Wall Thickness, t = 0.3125 in. B=6 HSS16X16X3/8
Depth across Flats, h(flat) 6.6250 in. HSS16X16X5/16
Width across Flats, b(flat) 4.6250 in. HSS16X12X5/8
Design Parameters: HSS16X12X3/8
1.00 Table 10-1 HSS16X12X5/16
Ice Height Factor, fz = 1.0220 If 0 < z <= 900, then fz = (z/33)^(0.10), else fz = 1.4 HSS16X8X5/8
Design Ice Thickness, td = 0.511 in. HSS16X8X1/2
56.00 pcf HSS16X8X3/8
Weight of Ice (for td), Wi = 2.38 psf HSS16X8X5/16
HSS16X8X1/4
Ice Load Based on Circumsribing Diameter of Member per Code: HSS16X4X5/8
Circumscribing Dia., Dc = 9.46 in. Dc = 2*(SQRT((b(flat)/2)^2+(h/2-2.25*t)^2)+2.25*t) HSS16X4X1/2
Area of Ice (for td), Ai = 16.01 in.^2 HSS16X4X3/8
Unif. Distributed Ice Load, wi = 6.22 plf HSS16X4X5/16
HSS16X4X1/4
Ice Load Based on Perimeter of Member: (for comparison purposes) HSS16X4X3/16
Perimeter, Pm = 30.53 in. HSS14X14X5/8
Unif. Distributed Ice Load, wi = 6.07 plf wi = (Pm/12)*Wi HSS14X14X1/2
HSS14X14X3/8
Note: outside radius of HSS at corners = 2.25*t HSS14X14X5/16
HSS14X10X5/8
HSS14X10X1/2
HSS14X10X3/8
HSS14X10X5/16
HSS14X10X1/4
HSS14X6X5/8
HSS14X6X1/2
HSS14X6X3/8
HSS14X6X5/16
HSS14X6X1/4
HSS14X6X3/16
HSS14X4X5/8
Importance Factor, Ii =
td = 2.0*ti*Ii*fz*(Kzt)^(0.35)Density of Ice, Id = Id = density of ice (assumed = 56 pcf)
Wi = (td/12)*Id
Ai = p*td*(Dc+td)wi = (Ai/144)*Id
Pm = 2*(h(flat)+b(flat)+p*2.25*(t+td/2))
Nomenclature
C10
TABLE 1-1 Occupancy Category of Buildings and Other Structures for Flood, Wind, Snow, Earthquake, and Ice Loads Nature of Occupancy Occupancy Category Buildings and structures that represent a low hazard to human life in the event of failure including, I but not limited to: - Agriculture facilities - Certain temporary facilities - Minor storage facilities Buildings and other structures except those listed in Categories I, III and IV II Buildings and other structures that represent a substantial hazard to human life in the event of III failure including, but not limited to: - Buildings and other structures where more than 300 people congregate in one area - Buildings and other structures with day-care facilities with capacity greater than 150 - Elementary or secondary school facilities with capacity greater than 250 - Colleges & adult education facilities with a capacity greater than 500 - Health care facilities with a capacity greater than 50 resident patients but not having surgery or emergency treatment facilities - Jails and detention facilities Buildings and other structures, not includes in Occupancy Category IV, with potential to cause substantial economic impact and/or mass disruption of day-to-day civilian life in event of failure, including, but not limited to: - Power generating stations, water treatment facilities, sewage treatment facilities, and telecommunication centers - Buildings and structures not included in Category IV containing sufficient quantities of toxic, explosive, or other hazardous materials dangerous to the public if released Buildings and other structures designated as essential facilities including, but not limited to: IV - Hospitals and health care facilities having surgery or emergency treatment facilities - Fire, rescue and police stations and emergency vehicle garages - Designated earthquake, hurricane or other emergency shelters - Designated emergency preparedness, communication, and operation centers and other facilities required for emergency response - Power-generating stations and other public utility facilities required in an emergency - Ancillary structures required foroperation of Category IV structures during an emergency - Aviation control towers, air traffic control centers and emergency aircraft hangars - Water storage facilities and pump structures required to maintain water pressure for fire suppression - Buildings and other structures having critical national defense functions - Buildings and structures containing extremelyhazardous materials where quantity of material exceeds a threshhold quantity established by authority having jurisdiction
C12
The Topographic Factor, Kzt, accounts for effect of wind speed-up over isolated hills and escarpments (Sect. 6.5.7 and Fig. 6-4). Kzt = (1+K1*K2*K3)^2 (Eq. 6-3), where: H = height of hill or escarpment relative to the upwind terrain, in feet. Lh = Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet. K1 = factor to account for shape of topographic feature and maximum speed-up effect. K2 = factor to account for reduction in speed-up with distance upwind or downwind of crest. K3 = factor to account for reduction in speed-up with height above local terrain. x = distance (upwind or downwind) from the crest to the building site, in feet. z = height above local ground level, in feet. The effect of wind speed-up shall not be required to be considered (Kzt = 1.0) when H/Lh < 0.2, or H < 15' for Exposures 'C' and 'D', or H < 60' for Exposure 'B'.
C29
TABLE 10-1 IMPORTANCE FACTOR, I, (ICE LOADS) Category* I I 0.80 II 1.00 III 1.25 IV 1.25 *See Section 1.5 and Table 1-1.
for Ice Loads Due to Freezing Rain on Round HSS and Pipe ShapesJob Name: Subject: II
Job No: Originator: Checker: IIIIV
Input Data: ######
Member Size = Pipe8STD ###Building Classification = II Table 1-1, page 3 ###
Nominal Ice Thickness, ti = 0.250 in. Figures 10-2 through 10-6, pages 104-108 ###Topographic Factor, Kzt = 1.00 Section 6.5.7 & Figure 6-4 ###Height Above Ground, z = 41.01 ft. ###
HSS16X0.250
HSS14X0.625
t=0.322 HSS14X0.500
HSS14X0.375
HSS14X0.312
Results: HSS14X0.250
HSS12.750X0.500
Member Properties for Pipe8STD: HSS12.750X0.375
Outside Diameter, OD = 8.625 in. ID=7.981 HSS12.750X0.250
Inside Diameter, ID = 7.981 in. OD = Dc =8.625 HSS10.750X0.500
Nominal Wall Thickness, t = 0.3220 in. HSS10.750X0.375
HSS10.750X0.250
Design Parameters: HSS10X0.625
1.00 Table 10-1 Ice Height Factor, fz = 1.0220 If 0 < z <= 900, then fz = (z/33)^(0.10), else fz = 1.4 HSS10X0.375
Design Ice Thickness, td = 0.511 in. HSS10X0.312
56.00 pcf HSS10X0.250
Weight of Ice (for td), Wi = 2.38 psf HSS10X0.188
HSS9.625X0.500
Ice Load Based on Circumsribing Diameter of Member per Code: HSS9.625X0.375
Circumscribing Dia., Dc = 8.63 in. Dc = OD HSS9.625X0.312
Area of Ice (for td), Ai = 14.67 in.^2 HSS9.625X0.250
Unif. Distributed Ice Load, wi = 5.70 plf HSS9.625X0.188
HSS8.625X0.625
Ice Load Based on Perimeter of Member: (same as above for round sections, since Dc = OD) HSS8.625X0.500
Perimeter, Pm = 28.70 in. HSS8.625X0.375
Unif. Distributed Ice Load, wi = 5.70 plf wi = (Pm/12)*Wi HSS8.625X0.322
HSS8.625X0.250
HSS8.625X0.188
HSS7.625X0.375
HSS7.625X0.328
HSS7.500X0.500
HSS7.500X0.375
HSS7.500X0.312
HSS7.500X0.250
HSS7.500X0.188
HSS7X0.500
HSS7X0.375
HSS7X0.312
HSS7X0.250
HSS7X0.188
HSS7X0.125
HSS6.875X0.500
Importance Factor, Ii =
td = 2.0*ti*Ii*fz*(Kzt)^(0.35)Density of Ice, Id = Id = density of ice (assumed = 56 pcf)
Wi = (td/12)*Id
Ai = p*td*(Dc+td)wi = (Ai/144)*Id
Pm = p*(OD+td)
Nomenclature
C10
TABLE 1-1 Occupancy Category of Buildings and Other Structures for Flood, Wind, Snow, Earthquake, and Ice Loads Nature of Occupancy Occupancy Category Buildings and structures that represent a low hazard to human life in the event of failure including, I but not limited to: - Agriculture facilities - Certain temporary facilities - Minor storage facilities Buildings and other structures except those listed in Categories I, III and IV II Buildings and other structures that represent a substantial hazard to human life in the event of III failure including, but not limited to: - Buildings and other structures where more than 300 people congregate in one area - Buildings and other structures with day-care facilities with capacity greater than 150 - Elementary or secondary school facilities with capacity greater than 250 - Colleges & adult education facilities with a capacity greater than 500 - Health care facilities with a capacity greater than 50 resident patients but not having surgery or emergency treatment facilities - Jails and detention facilities Buildings and other structures, not includes in Occupancy Category IV, with potential to cause substantial economic impact and/or mass disruption of day-to-day civilian life in event of failure, including, but not limited to: - Power generating stations, water treatment facilities, sewage treatment facilities, and telecommunication centers - Buildings and structures not included in Category IV containing sufficient quantities of toxic, explosive, or other hazardous materials dangerous to the public if released Buildings and other structures designated as essential facilities including, but not limited to: IV - Hospitals and health care facilities having surgery or emergency treatment facilities - Fire, rescue and police stations and emergency vehicle garages - Designated earthquake, hurricane or other emergency shelters - Designated emergency preparedness, communication, and operation centers and other facilities required for emergency response - Power-generating stations and other public utility facilities required in an emergency - Ancillary structures required foroperation of Category IV structures during an emergency - Aviation control towers, air traffic control centers and emergency aircraft hangars - Water storage facilities and pump structures required to maintain water pressure for fire suppression - Buildings and other structures having critical national defense functions - Buildings and structures containing extremelyhazardous materials where quantity of material exceeds a threshhold quantity established by authority having jurisdiction
C12
The Topographic Factor, Kzt, accounts for effect of wind speed-up over isolated hills and escarpments (Sect. 6.5.7 and Fig. 6-4). Kzt = (1+K1*K2*K3)^2 (Eq. 6-3), where: H = height of hill or escarpment relative to the upwind terrain, in feet. Lh = Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet. K1 = factor to account for shape of topographic feature and maximum speed-up effect. K2 = factor to account for reduction in speed-up with distance upwind or downwind of crest. K3 = factor to account for reduction in speed-up with height above local terrain. x = distance (upwind or downwind) from the crest to the building site, in feet. z = height above local ground level, in feet. The effect of wind speed-up shall not be required to be considered (Kzt = 1.0) when H/Lh < 0.2, or H < 15' for Exposures 'C' and 'D', or H < 60' for Exposure 'B'.
C27
TABLE 10-1 IMPORTANCE FACTOR, I, (ICE LOADS) Category* I I 0.80 II 1.00 III 1.25 IV 1.25 *See Section 1.5 and Table 1-1.
"ASCE705I.xls" ProgramVersion 1.1
14 of 15 04/19/2023 08:59:45
HSS6.875X0.375
FIGURE 10-2: 50-Year Mean Occurance Interval Uniform Ice Thickness Due to Freezing Rain with Concurrent 3-Second Wind Gust Speeds - Contiguous 48 States