HomeMy WebLinkAboutBLG_BLD-22-006.1_Brace_Wall_Analysis_Wind_SpeedBLD-22-006.1
Brace Wall Analysis, Wind Speed (Revised)
Effective immediately, the following procedure supersedes Memo 006 -Brace Wall Analysis, Wind Speed issued on July 11, 2022. All Plans submitted prior to July 11, 2022 will be reviewed based on the
June 17, 2022 criteria for less than 140 mph.
For Residential Building (Risk Category II) Brace Wall Analysis
1.To determine wind speed, use the ASCE 7 Hazard Tool website:
https :// asce 7hazardtool. on! inc
2.If the wind speed calculated by the ASCE 7 Hazard Tool is less than 130 mph then:
a.The American Plywood Association (AP A) Calculator output will be accepted for theBrace Wall Analysis per the 20 I 8 IRC (International Residential Code).
Note: The use of other wind speed reduction factors cannot be used to further reduce thewind speed input into the AP A calculator.
b.Submit the APA Calculator Analysis as part of the Residential Permit Application thatshall be signed and stamped with expiration date by the Hawaii Licensed Architect orStructural Engineer of Record.
https ://www .apawood.org/calculatorCounty of Hawai'i is an E4ual Oppo11unity Provider and Employer. COUNTY OF HAWAI'I - 101 Pauahi Street, Suite 7 -Hilo, Hawai‘i 96720 Hilo Office (808) 961-8331
Fax (808) 961-8410
DEPARTMENT OFPUBLIC WORKS–BUILDING DIVISION
Kona Office (808) 327-3520
Fax (808) 327-3509
c.Additional structural engineering calculations for wall bracing will not be required.
3.If the wind speed calculated by the ASCE 7 Hazard Tool is 130 mph or greater then:
a.Submit a brace wall design and calculations prepared, signed and stamped withexpiration date by the Hawaii Licensed Architect or Structural Engineer of
Record.
This procedure is limited to the wall bracing design and shall not be applicable to the wind borne debris zone requirements of County of Hawaii Chapter SB R301.2.1.1, and subsections as shown in Figure R301.2(5)(b) delineated by Ultimate Wind Speed 130 mph and higher.