ASCE 7-10 Other Structures DP Calculator
Design Pressures for Other Structures 
                                                                            ASCE 7-10                              Version 3.0                      08/31/2018
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    Rooftop Structures and Equipment         Open Signs & Lattice Frameworks      
                   
                       
                       
                       
                       
                       
   
         
     
    Solid Attached Signs       Solid Freestanding Walls and Signs      
                   
                       
   
         
     
Open Signs & Lattice Frameworks
Input Description Value Units Description
Hexagonal or Octagonal Round
Exposure Category: 
Upwind exposure based on ground surface roughness
Ultimate Wind Speed, V ult = mph Ultimate wind speed, in miles per hour
  Cross-Section (Shape):
  Square (wind normal to face) Square (wind along diagonal)        
                       
  (Signs with openings comprising 30% or more of the gross area are classified as open signs)          
  h = ft                
  % Open =   Ratio of openings to gross area            
  D =
Diameter of a typical round member, in inches
in Diameter of Typical Round Member          
                       
  K d =
Kd = Wind Directionality Factor

Chimneys, Tanks, and Similar Structures:
Square: 0.90
Hexagonal: 0.95
Round: 0.95

Solid Freestanding Walls and Solid Freestanding and Attached Signs: 0.85

Open Signs & Lattice Framework: 0.85
  C f =            
  q z = lb/ft 2 ε =            
  G =   D√q z = √lb          
                       
    Pressure = F / surface area              
    = q z GC f A f / A f       Logic check    
    =         ε * Pressure    
    = lb/ft 2       lb/ft 2    
               
Rooftop Structures and Equipment (Florida, HVHZ only)              
(FBC 2014, Section 1620.6; ASCE 7-10, Section 29.5)
          Lateral Force Uplift Force
  Input Description Value     K d =
Kd = Wind Directionality Factor

Chimneys, Tanks, and Similar Structures:
Square: 0.90
Hexagonal: 0.95
Round: 0.95

Solid Freestanding Walls and Solid Freestanding and Attached Signs: 0.85

Open Signs & Lattice Framework: 0.85
    K d =
Kd = Wind Directionality Factor

Chimneys, Tanks, and Similar Structures:
Square: 0.90
Hexagonal: 0.95
Round: 0.95

Solid Freestanding Walls and Solid Freestanding and Attached Signs: 0.85

Open Signs & Lattice Framework: 0.85
 
  Exposure Category: 
Upwind Exposure based on ground surface roughness
   
Velocity Pressure
q z =
lb/ft 2  
Velocity Pressure
q z =
lb/ft 2
  Ultimate Wind Speed, V ult =
Ultimate wind speed, in miles per hour
   
Project, or specified, surface area normal to the wind, in ft^2
A f =
ft 2  
Projected, or specified, surface area normal to the wind , in ft^2
A r =
ft 2
  Structure Shape:
Structure Shape:
Used to determine Kd

Chimneys, Tanks, and Similar Structures:
Square: 0.90
Hexagonal: 0.95
Round: 0.95
  lateral (GC f ) =     vertical (GC f ) =  
Height of Roof, MRH =
Mean roof height, in feet.

Maximum roof heights:
Exposure B: 1200
Exposure C: 900
Exposure D: 700
ft
Pressure=Fv/horizontal projected area of roof
Pressure =
q z (GC f )A f / A f  
Pressure=Fv/horizontal projected area of roof
Pressure =
q z (GC f )A r / A r
 Building Length, L =
Horizontal dimension of a building measured parallel to the wind direction, in feet
ft =
=
  Building Width, B=
Horizontal dimension of building measured normal to wind direction, in feet
ft = lb/ft 2   = lb/ft 2
               
              Equipment Height = in
              Equipment Width = in
Solid Attached Signs       Adjusted component area = ft 2 Pressures  
(ASCE 7-10, Section 29.4.2)     K d =
Kd = Wind Directionality Factor

Chimneys, Tanks, and Similar Structures:
Square: 0.90
Hexagonal: 0.95
Round: 0.95

Solid Freestanding Walls and Solid Freestanding and Attached Signs: 0.85

Open Signs & Lattice Framework: 0.85
  For h ≤ 60, q h GC p  
        K h =          
  Input Description Value   q h = lb/ft 2 For h > 60, q z GC p  
 
Upwind exposure based on ground surface roughness
Exposure Category: 
  K z =     q h GC p  
  Ultimate Wind Speed, V ult =   q z = lb/ft 2        
 
Component Location
Zone:
  GC p+ =   Wind Pressures: lb/ft 2  
        GC p– =     lb/ft 2  
Pitch: :12 Width =
Component width
in
Mean roof height
MRH =
ft Height =
Component height
in
 
Minimum building dimension
Least Horizontal Dimension, LHD   =
ft z =
Component height above grade
ft
                       
Solid Freestanding Walls and Solid Freestanding Signs              
(ASCE 7-10, Section 29.4.1)                    
                       
  Input Description Value Units Description            
  Exposure Category: 
  Upwind exposure based on ground surface roughness      
  Ultimate Wind Speed, V ult = mph Ultimate wind speed, in miles per hour          
  % Open =
Reduction Factor for Solid Signs:
Reductions for solid signs are included in this calculator. Force coefficients for solid signs with openings shalll be permitted to be multiplied by the reduction factor (1-(1-ε)^1.5)
  Ratio of openings to gross area          
                       
                       
    B =
Horizontal dimension of sign, in feet (distance from left side to right side of sign)
ft              
                     
                       
          s =
Vertical dimension of sign, in feet (distance from bottom of sign to top of sign)
ft        
                       
          h =
Height to the top of the sign, in feet (distance from ground to top of sign)
ft        
                       
                       
                       
                       
                       
                       
                       
                       
  Cases A & B      
  K d =
Kd = Wind Directionality Factor

Chimneys, Tanks, and Similar Structures:
Square: 0.90
Hexagonal: 0.95
Round: 0.95

Solid Freestanding Walls and Solid Freestanding and Attached Signs: 0.85

Open Signs & Lattice Framework: 0.85
  C f =            
  q h = lb/ft 2                
  G =   General reduction factor =   (openings comprised of
< 30% gross area)
     
B/s =
s/h =
pressure = F / surface area
    = q h GC f A s / A s           Logic check
=
ε * Pressure
    = lb/ft 2         lb/ft 2
  Case C      
  Case C applicable?   General reduction factor =   (openings comprised of
< 30% gross area)
     
  K d =
Kd = Wind Directionality Factor

Chimneys, Tanks, and Similar Structures:
Square: 0.90
Hexagonal: 0.95
Round: 0.95

Solid Freestanding Walls and Solid Freestanding and Attached Signs: 0.85

Open Signs & Lattice Framework: 0.85
         
  q h = lb/ft 2      
  G =   Reduction factor (for Case C) =              
B/s =
s/h =
pressure = F / surface area
    = q h GC f A s / A s              
=
= (see pressures)
                       
  Region C f Adjusted C f Pressure (lb/ft 2 )   Logic check
    ε * Pressure
   
 
 
   
   
   
                       
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