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EZ Wind Software

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How the program Works:

Buildings and their components are to be designed to withstand the code-specified wind loads. Calculating wind loads is important in design of the wind force-resisting system, including structural members, components, and cladding, against shear, sliding, overturning, and uplift actions.

Wind Load Calculation Procedures

The design wind loads for buildings and other structures shall be determined according to one of the following procedures:

Method 1 – Simplified procedure for low-rise simple diaphragm buildings

Method 2 – Analytical procedure for regular shaped building and structures

Method 1 – Simplified Procedure

The simplified procedure is used for determining and applying wind pressures in the design of simple diaphragm buildings with flat, gabled, and hipped roofs and having a mean roof height not exceeding the least horizontal dimension or 60 feet (18.3 m), whichever is less, and subject to additional limitations.

Following are the steps of the simplified procedure:
  1. Determined the basic wind speed, V, in accordance with ASCE 7 Figure 6-1 or IBC Figure 1609, assuming the wind can come from any direction. ASCE 7 6.5.4 includes some provisions for the special wind regions indicated, near mountainous terrain, and near gorges.
  2. Determine the importance factor, I, in accordance with ASCE 7 Table 6-1 & Table 1- 1, or with IBC Table 1604.5. 3
  3. Determine the exposure category in accordance with ASCE 7 Section 6.5.6 or IBC Section 1609.4. 4.
  4. Determine the height and exposure adjustment coefficient, X, from ASCE 7 Figure 6- 2 or IBC Table 1609.6.2.1 (4)
  5. Determine PS30 , the simplified wind pressure for exposure B, at h=30 ft, for I=1.0,from ASCE 7 Figure 6-2 or IBC Table 1609.6.2.1.
Simplified design wind pressures, pS, for the main wind force resisting systems of low- rise simple diaphragm buildings is determined by the following equation:

where pS represents the net pressure (sum of internal and external) to be applied to the horizontal and vertical projections of building surfaces. For the horizontal pressures, pS is the combination of the windward and leeward net pressures.

Method 2– Analytical Procedure

Wind loads for buildings and structures that do not satisfy the conditions for using the simplified procedure can be calculated using the analytical procedure provided that it is a regular shaped building or structure, and it does not have response characteristics making it subject to across-wind loading, vortex shedding, instability due to galloping or flutter, or does not have a site location that require special consideration.

The steps of analytical procedure, described in ASCE 7 Section 6.5.3 only, are as follows:

  1. Determine the basic wind speed, V, and wind directionality factor, Kd in accordance with ASCE 7 Section 6.5.4.
  2. Determine the importance factor, I, in accordance with ASCE Section 6.5.5. 3.
  3. Determine the exposure category or exposure categories and velocity pressure exposure coefficient, Kz or Kh, as applicable, for each wind direction according to ASCE 7 Section 6.5.6. 4.
  4. Determine the topographic factor, Kzt, if applicable, according to ASCE 7 Section 6.5.7. 5.
  5. Determine the gust effect factor G or Gf, as applicable, in accordance with ASCE 7 Section 6.5.8. 6.
  6. Determine the enclosure classification in accordance with Section 6.5.9. 7.
  7. Determine the internal pressure coefficient, GCpi in accordance with ASCE 7 Section 6.5.11.1. 8.
  8. Determine the external pressure coefficients, Cp or GCpf, or force coefficients, Cf, as applicable, in accordance with ASCE 7 Section 6.5.11.2 or 6.5.11.3. 9.
  9. Determine the velocity pressure, qz or qh, as applicable, in accordance with ASCE 7 Section 6.5.10. The velocity pressure, qz evaluated at height z is calculated by the following equation
  10. Determine the design wind pressure, p or design wind load, F, as applicable, in accordance with ASCE 7 Section 6.5.12 and 6.5.13. The design wind pressure is given by the following equations:

For rigid buildings of all height



For flexible buildings

 

Where

q=qz for windward walls evaluated at hight z above the ground, q=qh for leeward walls, side walls, and roofs evaluated at height h

qi= qh for windward walls, side walls, leeward walls, and roofs of enclosed buildings

qi=qz for positive internal pressure evaluation in partially enclosed buildings

For low-rise buildings

 

The design wind load, F, on open buildings and other structures is determined by the following formula:

 

Where

qz= velocity pressure evaluated at height z of the centroid area Af Af=projected area normal to the wind (ft2) (m2)

 

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