Hawaii Administrative Rules › Title 3 - DEPARTMENT OF ACCOUNTING AND GENERAL SERVICES › Building Code Council › State Building Code Council › Amendments to the 2018 ICC International Building Code (IBC) › 56 - Appendix W - Hawaii wind design provisions for new construction

Current through June, 2024
Appendix W is added to read as follows:
"APPENDIX W
Hawaii Wind Design Provisions for New
					 Construction
W101 Revisions to Chapter
					 2, Chapter
					 16
					 and Chapter 23.
Wind design shall be in accordance with this code as
					 amended by Sections W101 through W109.
W102 Windborne Debris Region
					 definition.
The definition of "Windborne Debris Region" in Section 202
					 is amended to read as follows:
"WIND-BORNE DEBRIS REGION. Areas in Hawaii where the basic
					 design wind speed is 130 mph (63 m/s) or greater. For Risk Category II
					 buildings and structures, the wind-borne debris region shall be based on Fig
					 1609.3 (5). For Risk Category III buildings and structures, the wind-borne
					 debris region shall be based on Figure 16093(6). For Risk Category IV
					 buildings, the windborne debris region shall be based on Fig 1609.3
					 (7)."
W103 Revised Notations for Section
					 1602
The following Notations are added to Section 1602:
"Veff-asd
=
Effective
					 allowable stress design wind speed, miles per hour (mph) (km/hr) where
					 applicable, calculated per Section 160931, that includes the effect of the
					 special Hawaii factors for topographic effects and directionality.
V =
Basic design wind speeds, miles per
					 hour (mph) (km/hr) determined from Figures 1609.3(1) through 1609.3(8) or ASCE
					 7 map for the Risk Category, applied to the strength design of the
					 structure.
Vunt
= Ultimate
					 design wind speed miles per hour, (mph) (km/hr), of the region prior to any
					 pressure calculation adjustments of topographic effects per Section 1609.3.2 or
					 directionality effects per Section 1609.3.3."
W104 Wind design data.
Section 1603.1.4 is amended to read as follows:
"1603.1.4
Wind design data.
The
				  following information related to wind loads shall be shown, regardless of
				  whether wind loads govern the design of the lateral force-resisting system of
				  the structure:
1. Basic design wind speed, V,
				  miles per hour (km/hr) and effective allowable stress design wind speed,
				  Veff-asd, as determined in accordance with Section 1609.3.1.
2. Risk category.
3. Wind exposure. Applicable wind direction
				  if more than one wind exposure is utilized.
4. Applicable internal pressure
				  coefficient.
5. Design wind
				  pressures to be used for exterior component and cladding materials not
				  specifically designed by the registered design professional responsible for the
				  design of the structure, psf (kN/m2)."
W105 Amendments to Section 1609.1 through
					 1609.4
Sections 1609.1 through 1609.4 are amended to read as
					 follows:
"1609.1 Applications.
Buildings, structures and parts thereof shall be designed
					 to withstand the minimum wind loads prescribed herein. Decreases in wind loads
					 shall not be made for the effect of shielding by other structures.
1609.1.1
Determination of wind
				  loads.
Wind loads on every building or structure shall be
					 determined in accordance with Chapters
					 26 to
					 30 of ASCE 7. Minimum values for
					 Directionality Factor, Kd, Velocity Pressure Exposure Coefficient, Kz, and
					 Topographic Factor, Kzt, shall be determined in accordance with Section 1609.
					 The type of opening protection required, the basic design wind speed, V, and
					 the exposure category for a site is permitted to be determined in accordance
					 with Section 1609 or ASCE 7. Wind shall be assumed to come from any horizontal
					 direction and wind pressures shall be assumed to act normal to the surface
					 considered.
Exceptions:
1.
				  Subject to the limitations of Section 1609.1.1.1, the provisions of ICC 600
				  shall be permitted for applicable Group R-2 and R-3 buildings.
2. Subject to the limitations of Section
				  1609.1.1.1, residential structures using the provisions of AWC WFCM.
3. Subject to the limitations of Section
				  1609.1.1.1, residential structures using the provisions of AISI S230.
4. Designs using NAAMM FP 1001.
5. Designs using TIA-222 for
				  antenna-supporting structures and antennas, provided the effect of topography
				  is included in accordance with Section 1609.3.3 Topographic effects.
6. Wind tunnel tests in accordance with ASCE
				  49 and Sections 31.4 and 31.5 of ASCE 7.
The wind speeds in Figures 1609.3(1) through 1609.3(8) are
					 basic design wind speeds, V, and shall be converted in accordance with Section
					 1609.3.1 to allowable stress design wind speeds,
Veff-asd,
when the provisions of the
					 standards referenced in Exceptions 4 and 5 are used.
1609.1.1.1 Applicability
The provisions of ICC 600 are applicable only to buildings
					 located within Exposure B or C as defined in Section 1609.4.
The prescriptive provisions of ICC 600, AWC WFCM, or AISI
					 S230 shall not be permitted for either of the following cases:
1. Structures which are more than three
				  stories above grade plane in height.
2. Structures designed using exception 3 in
				  Section 1609.2 Protection of Openings.