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ASCE7-10: Modifications to Wind Loading Requirements

Speaker:
Jason Ericksen, S.E.
Date:
May 9, 2012
Session Details

There have been two major changes in the ASCE 7-10 wind load provisions: a complete reorganization of the chapters containing the provisions, and new basic wind speed maps. This SEU session included a summary of these and related minor changes. The challenges associated with these changes are where to find everything you need within ASCE 7-10, and determining if there will be a significant change to the design of structures in your area. The session discussion addressed both of these challenges.

Because of the reorganization of the chapters containing the provisions, many engineers have had questions about where to locate different methods of design. This session mapped the familiar names of the design methods from ASCE 7-05 to the new method names and locations. A flowchart identified the limits of each method to help you choose the simplest method for any structure.

The changes to the maps include the introduction of new Risk Category Specific wind maps that eliminate the need for the importance factor in wind design. Basic wind speeds and design pressures have increased; however, the load factors in the LRFD and ASD load combinations have been reduced to counteract these increases. A discussion of how design forces are likely to change (based mainly on location) brought all these factors together to investigate the effect on the final design.

Session Length: 1.5 hours

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