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Wind Loads on Structures 4:

This software performs all the wind load computations in ASCE 7-98, 02 or 05, Section 6 and ASCE 7-10, Chapters 26-31. The software allows the user to "build" structures within the system (buildings, signs, chimneys, tanks, and other structures). It provides basic wind speeds from a built-in version of the wind speed map(s) or allows the user to enter a wind speed. It provides for input of topographic features. It allows the user to have different exposures for different wind directions. It has numerous specialty calculators. A bullet list below describes the software's most significant features.

The following well known engineers served as technical consultants who provided input to the development of this software:

  • Dr. Kishor C. Mehta, past chairman of the ASCE Wind Load Committee, Director of the Wind Engineering Research Center and Horn Professor of Civil Engineering at Texas Tech University

  • Dr. James R. McDonald, member of the ASCE Wind Load Committee, professor and chair of Civil Engineering and faculty associate of the Wind Engineering Research Center at Texas Tech University

  • Dr. H. Scott Norville, Chairman of ASTM F12 Committee on Building Security, Director of the Glass Research and Testing Laboratory, faculty associate of the Wind Engineering Research Center, and Professor of Civil Engineering at Texas Tech University

  • Dr. Douglas A. Smith, Associate Professor of Civil Engineering and Faculty Associate of the Wind Engineering Research Center at Texas Tech University.


Changes Include:

The Wind Loads on Structures 4 update includes all the changes that occurred in the ASCE 7 2010 standard update.  (Chapters 26-31)


Major changes to the standard include:

  1. Removal of the building importance factor multiplier

  2. Addition of Occupancy Category I, II and III & IV wind speed maps.



  • General:

    • The software operates in a Windows TM environment.

    • The software is user friendly. It allows the user to update and change parameters continuously through the process of determining wind loads for a given structure without starting from scratch with each update. 

    • The software operates in US standard or SI metric units. The user can convert back and forth by toggling a switch on the toolbar.

    • The software computes wind loads by analytical method rather than the simplified method.

    • The software provides the user with options for determining wind loads for: 

      • buildings

      • chimneys, tanks, and similar structures

      • trussed towers

      • signs

      • domed structures (ASCE 7-02 and later only)

  • Location and Topography

    • The software "reads" the wind speed maps (including the Continental US, Alaska and new to 2010: Puerto Rico) for the user with the same or better accuracy the user could achieve by "eyeballing" the map.

    • The software allows the user to describe the topography by using parameters for the topographic conditions included in ASCE 7-98/02/05 Section 6 or ASCE 7-10 Chapter 26.

  • Buildings

    • The software allows the user to "build" the building by adding sections. The software does not constrain the user to a set of preordained footprints.

    • Software provides a drawing of the structure as the user adds sections.

    • The software incorporates all roof types and combinations defined in ASCE 7-98/02/05 or ASCE 7-10, Chapters 27-28.

    • Software allows the user to define roof slopes in terms of degrees or as a ratio (x:12) and to input all salient roof dimensions.

    • The software allows the user to obtain wind loads for the main wind force resisting system (MWRFS) at pre-selected height intervals or user-defined intervals.

    • When a building is completely defined in terms of geometry, the program will also perform the computations for the wind loads of user defined Components and Cladding.

    • 2005 (and later) open structure provisions have been added to allow roof shapes of monosloped, pitched and troughed. 

  • Calculations and Output

    • The user can "click" on various intermediate values of the MWFRS results to obtain the details of the calculations for a specific value, including: velocity pressure, gust effect factor, cp, cf and net pressures. The software prints a full report of load for the MWFRS.

    • The software provides calculators to allow the user to "play" with parameters without changing his current design. The user can print results from the calculators individually. The printouts include the data entered, intermediate calculations with equations, and the final answers.

    • The software will output wind loads to excel files to facilitate their incorporation into structural analysis programs



Annual Fee
Single User $100




** PRICE PER SEAT!  Due to the nature of the network and terminal versions we do not offer discounts on the prices.

After the release of WLS4, SDG will no longer support versions of Wind Loads on Structures released prior to 2007.  In addition, SDG will issue a license for WLS4 valid for one year.  If you wish to continue using WLS4, you must renew annually.  Failure to renew the license will result in WLS4 not operating.  Standards Design Group must do this to continue operating and providing technical support.  For every year your serial number has expired you will be charged an annual fee until that amount equals the cost of a new purchase.


System Requirements:


Operating Systems:

     Microsoft Windows 95,98,ME (With Microsoft Internet Explorer 5.01 or later)

     Microsoft Windows NT 4.0 SR 3

     Microsoft Windows 2000

     Microsoft Windows XP

     Microsoft Windows Vista*

     Microsoft Windows 7*

     Microsoft Windows 8 * 

     Microsoft Windows 10 * 

*Does not support the Help file, we are working on a hard copy manual


     Microsoft Windows Server 2000

     Microsoft Windows NT Server 4.0

     Microsoft Windows Server 2003


     486 or faster

     16 M ram

     Windows compatible printer


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