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Building Codes and RS222-G
Until 1994 there had been three different building codes used: BOCA National Building Code (BOCA/NBC), Uniform Building Code (UBC) and Standard Building Code (SBC).
The history of building codes in this country could be the subject of a separate article, but it is important to know that these codes were combined into a single document called the International Building Code (IBC) first published in 2000. Most jurisdictions currently use either the 2006 or 2009 version of the IBC. Portions of the IBC, particularly those that require competency in specific engineering disciplines, reference other standards documents. One such standard is the Minimum Design Loads for Buildings and Structures published by the American Society of Civil Engineers (ASCE-7). In civil engineering applications this document the effects of wind, ice and seismic activity on traditional building structures. The 222G standard now incorporates the wind map data specifies in ASCE-7, which uses the latest information gathered throughout the country. The previous version of the 222(F) standard also referenced an earlier version of the ASCE-7(-93), which utilized a different method to calculate wind and ice loading (fastest mile) but ASCE-7 has been revised three time since then and are using a different method (3-second gust) to calculate loading. The latest version ASCE-7-10 has made further adjustments to the loading tables.
Now the loading for both tower designs and building designs are can be addressed in the IBC as specified uniformly through ASCE-7.
You should note that both the ASCE-7 and 222G standards were written so all or portions could be included within the IBC. It is still up to the specific jurisdiction as to whether they chose to adopt these portions into their local codes.
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McNamara is president of Applied Wireless, Cape Coral, FL.
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