2015 IRC Essentials Workbook Page 33 24. 3.4 A surface wind speed map for Mexico. STRUCTURAL REQUIREMENTS Basic Wind Speed: IRC - 110 mph (3-second gust) IBC - Risk Category I: V ult 130 mph . Arizona 30-Meter Residential-Scale Wind Resource Map . This webinar will address the significant changes in the wind load provisions of the 2010 Edition of ASCE 7-10 that impact the wind provisions in the 2015 IBC and 2015 IRC. To arrive at the design wind load for a structure to be built under the IBC, all applicable factors provided in IBC Section 1609 in conjunction with ASCE 7-10 must be considered. R301.2(1) as determined from Figure R301.2(4)A. Building Planning 3. The structural provisions of this code for wind loads are not permitted where wind … A wind speed conversion table has been added for conversion from ultimate design to nominal design wind speeds. Since the 2012 IRC wind speed map is based on a “nominal” wind speed, but the wind speed entered into MiTek Engineering must be an “ultimate” wind speed as found in the references noted above, the program reports the ultimate design wind speed (V ult) along with the nominal design wind speed ( V asd) when ASCE 7-10 is chosen. Risk Category II: V. ult. Alaska 30-Meter Residential-Scale Wind Resource Map . 2015 IRC Modification: Ultimate design wind speed values replace basic wind speed values for 3-sec gust wind speeds in Section R301.2.1. B Cat. Please refer to ASCE 7-10, Table 1.5-1 for details. special wind regions or wind borne debris zones 2015 IRC Transition from the 2009 IRC 14 2015 Wind Design Criteria 2012 IRC 2015 IRC R301.2.1 R301.2 A new map indicates the geographic locations that require wind design, which means an engineered design in accordance with the IBC or ASCE 7, or a design in accordance with the Is a common wall or structurally separated wall Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4. The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed map [Figure R301.2(4)A]. This change was approved throughout the 2018 IBC along with the update of the design wind speed maps. The 2016 edition of ASCE 7 also uses the Strength Design model to determine wind speed, but the name of the design wind speeds has been changed to Basic Design Wind Speed. The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed map [Figure R301.2(4)A]. This means areas within a Hurricane Prone Region with a design wind speed of <130mph (IBC 2009 = <110mph) are not a wind-borne debris region and do not require protection of openings. ... accordance with the wind provisions of this code using the ultimate design wind speed in Table . 2012 International Residential Code . Speed (mph) Vult Topographic Effects Special Wind Region Wind-borne Debris Zone 30 psf 115 mph B ... IRC wind speeds are less than 110 mph 2015 IRC Essentials Workbook Page 39 32 For example, the sizing of wide flange steel beams. There have been inquiries as to when wind provisions are no longer applicable, and when buildings must be designed in accordance with one of the reference standards in Section R301.2.1.1, Wind Limitations and Wind Design Required, of the 2015 International Residential Code (IRC/2015). Alabama 30-Meter Residential-Scale Wind Resource Map . The methodology described in Section 2.8 was used to create a wind speed map for Mexico. Wind pressures calculated at worst-case product location (i.e. The United States wind speed map provides information on basic wind speed in miles per hour in geographic zones. In no case shall the minimum total length of bracing in a braced wall line, after all adjustments have been taken, be less than 48 inches (1219 mm) Wind Resource Geospatial Data. To make the maps above, multiyear average wind speeds were calculated from the WIND Toolkit.The contiguous United States, Canada, and Mexico are separate analysis regions and were thus calculated individually. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. 2015 International Energy Conservation Code, or . As before, study case 9 (58 stations) was considered. The results of the convoluted wind map for 2010 are shown in Figure 13. Apply changes to guard heights, wind speed and exposure requirements. RE: Basic Wind Speeds Interactive Map For 2015 I-Codes, please see Bulletin 03-4 and page 14 of the Fall 2016 Construction Code Commincator article, Wind Design Criteria IRC/2015.For previous codes, please see below.
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