Wind Loads During Construction
Wind Loads During Construction Design Wind Pressure Equation (SDG Eq. 2-1)
Basic Wind Speed (V): For construction Active, use 20 mph or expected wind speed, if higher. For Construction Inactive, use Table 2.4.1-2 multiplied by 0.6 if the exposure period is less than 1 year. The exposure period is the time period for which temporary load cases of the superstructure exist.
Velocity Pressure Exposure Coefficient (SDG Eq. 2-2)
ππ βΆ= 2.56π₯10β6 πΎπ π 2 πΊπΆπ 0.2105 πΎπ = 2.01(π§β900) β₯ 0.85 z = height to centroid of exposed area
Table 2.4.1-2 Basic Wind Speed, V County Basic Wind County (Dist) (Dist) Speed (mph) Alachua (2) 110 Hardee (1) Baker (2) 110 Hendry (1) Bay (3) 130 Hernando (7) Bradford (2) 110 Highlands (1) Brevard (5) 130 Hillsborough (7) Broward (4) 150 Holmes (3) Calhoun (3) 130 Indian River (4) Charlotte (1) 130 Jackson (3) Citrus (7) 130 Jefferson (3) Clay (2) 110 Lafayette (2) Collier (1) 150 Lake (5) Columbia (2) 110 Lee (1) DeSoto (1) 130 Leon (3) Dixie (2) 130 Levy (2) Duval (2) 130 Liberty (3) Escambia (3) 150 Madison (2) Flagler (5) 130 Manatee (1) Franklin (3) 130 Marion (5) Gadsden (3) 110 Martin (4) Gilchrist (2) 110 Miami-Dade (6) Glades (1) 130 Monroe (6) Gulf (3) 130 Nassau (2) Hamilton (2) 110 Okaloosa (3)
Basic Wind Speed (mph) 110 130 130 130 130 130 150 110 110 110 110 130 110 130 130 110 130 110 150 150 150 130 130
County (Dist) Okeechobee (1) Orange (5) Osceola (5) Palm Beach (4) Pasco (7) Pinellas (7) Polk (1) Putnam (2) St. Johns (2) St. Lucie (4) Santa Rosa (3) Sarasota (1) Seminole (5) Sumter (5) Suwannee (2) Taylor (2) Union (2) Volusia (5) Wakulla (3) Walton (3) Washington (3)
Basic Wind Speed (mph) 130 130 130 150 130 130 110 110 130 150 150 130 130 110 110 130 110 130 130 130 130
Gust Effect Factor (G): 0.85 for spans < 250β & height < 75β, otherwise use ASCE/SEI 7-05 Section 6.5.8.
Superstructure
Table 2.4.3-2 Pressure Coefficient During Construction (Cp): (Apply wind to projected height if shaded.) Component Type Pressure Coefficient (Cp) S/D β€ 3 S/D > 3 Girders 1 β 5 Girder 6+ Girder 1 Girder 2 Girder 3+ I-Shaped Steel Girder 2.2 1.1 2.5 0 1.1 I-Shaped Concrete Girder 2.0 1.0 2.0 0 1.0 U-Shaped Girder 2.2 Flat Slab/Segmental Box Girder 1.5 Substructure 1.6 Table 2.4.3-3 Pressure Coefficient During Construction (Cp): Single Brace or Cross-Frame Design Component Type Pressure Coefficient (Cp) β Apply to the height of a single girder. I-Shaped Steel Girder 2.9 I-Shaped Concrete Girder 2.6 U-Shaped Girder 3.3
Basic Wind Speed (V): For construction Active, use 20 mph or expected wind speed, if higher. For Construction Inactive, use Table 2.4.1-2 multiplied by 0.6 if the exposure period is less than 1 year. The exposure period is the time period for which temporary load cases of the superstructure exist.
Velocity Pressure Exposure Coefficient (SDG Eq. 2-2)
ππ βΆ= 2.56π₯10β6 πΎπ π 2 πΊπΆπ 0.2105 πΎπ = 2.01(π§β900) β₯ 0.85 z = height to centroid of exposed area
Table 2.4.1-2 Basic Wind Speed, V County Basic Wind County (Dist) (Dist) Speed (mph) Alachua (2) 110 Hardee (1) Baker (2) 110 Hendry (1) Bay (3) 130 Hernando (7) Bradford (2) 110 Highlands (1) Brevard (5) 130 Hillsborough (7) Broward (4) 150 Holmes (3) Calhoun (3) 130 Indian River (4) Charlotte (1) 130 Jackson (3) Citrus (7) 130 Jefferson (3) Clay (2) 110 Lafayette (2) Collier (1) 150 Lake (5) Columbia (2) 110 Lee (1) DeSoto (1) 130 Leon (3) Dixie (2) 130 Levy (2) Duval (2) 130 Liberty (3) Escambia (3) 150 Madison (2) Flagler (5) 130 Manatee (1) Franklin (3) 130 Marion (5) Gadsden (3) 110 Martin (4) Gilchrist (2) 110 Miami-Dade (6) Glades (1) 130 Monroe (6) Gulf (3) 130 Nassau (2) Hamilton (2) 110 Okaloosa (3)
Basic Wind Speed (mph) 110 130 130 130 130 130 150 110 110 110 110 130 110 130 130 110 130 110 150 150 150 130 130
County (Dist) Okeechobee (1) Orange (5) Osceola (5) Palm Beach (4) Pasco (7) Pinellas (7) Polk (1) Putnam (2) St. Johns (2) St. Lucie (4) Santa Rosa (3) Sarasota (1) Seminole (5) Sumter (5) Suwannee (2) Taylor (2) Union (2) Volusia (5) Wakulla (3) Walton (3) Washington (3)
Basic Wind Speed (mph) 130 130 130 150 130 130 110 110 130 150 150 130 130 110 110 130 110 130 130 130 130
Gust Effect Factor (G): 0.85 for spans < 250β & height < 75β, otherwise use ASCE/SEI 7-05 Section 6.5.8.
Superstructure
Table 2.4.3-2 Pressure Coefficient During Construction (Cp): (Apply wind to projected height if shaded.) Component Type Pressure Coefficient (Cp) S/D β€ 3 S/D > 3 Girders 1 β 5 Girder 6+ Girder 1 Girder 2 Girder 3+ I-Shaped Steel Girder 2.2 1.1 2.5 0 1.1 I-Shaped Concrete Girder 2.0 1.0 2.0 0 1.0 U-Shaped Girder 2.2 Flat Slab/Segmental Box Girder 1.5 Substructure 1.6 Table 2.4.3-3 Pressure Coefficient During Construction (Cp): Single Brace or Cross-Frame Design Component Type Pressure Coefficient (Cp) β Apply to the height of a single girder. I-Shaped Steel Girder 2.9 I-Shaped Concrete Girder 2.6 U-Shaped Girder 3.3
