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I would appreciate your input, Emilio. An updated study of the wind data from over 1,000 weather recording stations across the country was completed during this last cycle. This separation was between thunderstorm and non-thunderstorm events. The full-scale tests indicated that the turbulence observed in the wind tunnel studies from the 1970s, that many of the current roof pressure coefficients were based on, was too low. Considering all of these effects, a new zoning procedure for low-sloped roofs for buildings with h ≤ 60 feet was developed. ... -Works and Sewerage of Monterrey, N. L., Mexico The 4th article from the June, 1911, Volume LXXII, Transactions of the American Society of Civil Engineers. It seems that zones 2c and 3 could be different but not zone 1 or 2r. 1193, Feb. 1, 1911. Example of ASCE 7-10 Risk Category II Basic Wind Speed Map. Consequently, wind speeds generally decrease across the country, except along the hurricane coastline from Texas to North Carolina. This presentation examines these revisions and how they impact low-slope roof assem-bly design in resisting wind uplift. In conjunction with the new roof pressure coefficients, it was determined that the existing roof zoning used in ASCE 7-10 and previous editions of the Standard did not fit well with the roof pressure distributions that were found during these new tests for low-slope (≤ 7 degrees) roof structures. Printed with permission from ASCE. This limitation was removed in ASCE 7-16, and thus the provisions apply to rooftop equipment on buildings of all heights. It is necessary to look at the impact of the provisions as a whole, instead of individually, to understand how design procedures are affected.▪, Donald R. Scott is a Senior Principal at PCS Structural Solutions, Tacoma, WA. To help in this process, changes to the wind load provisions of ASCE 7-16 that will affect much of the profession focusing on building design are highlighted. Thus, these provisions are not applicable to open structures because the flow of the wind over the roof of enclosed structures and open structures varies significantly. Printed with permissionfrom ASCE. The zones are shown best in the Commentary Figure C30-1 as shown in Figure 6. There are also many minor revisions contained within the new provisions. These new maps better represent the regional variations in the extreme wind climate across the United States. Research became available for the wind pressures on low-slope canopies during this last code cycle of the Standard. Table 26.9-1 – ASCE 7-16 ground elevation factor. These tests established that the zoning for the roof on these low-slope roof structures was heavily dependent on the building height, h, and much less dependent on the plan dimensions of the building. Not many users of the Standard utilize the Serviceability Wind Speed Maps contained in the Commentary of Appendix C, but these four maps (10, 25, 50 & 100-year MRI) are updated to be consistent with the new wind speed maps in the body of the Standard. STRUCTURE® magazine is a registered trademark of the National Council of Structural Engineers Associations (NCSEA). See ASCE 7-16 for important details not included here. There are two methods provided in the new Standard. Calculation of Wind Loads on Structures according to ASCE 7-10 Permitted Procedures The design wind loads for buildings and other structures, including the Main Wind-Force Resisting System (MWFRS) and component and cladding elements thereof, shall be determined using one of the procedures as specified in the following section. All materials contained in this website fall under U.S. copyright laws. See ASCE 7-16for important details not included here. He is also Chair of ASCE 7 Wind Load Subcommittee and Chair of NCSEA Wind Engineering Committee. It also describes wind uplift design of roof assemblies in accordance with ASCE 7-16, with several illustrative examples. . Research is continuing on sloped canopies, and the Committee hopes to be able to include that research in the next edition of the Standard. The tests showed that the “corner zones” were too small for the high roof pressures that were being measured at these locations on the building. The roof zoning for sloped roofs kept the same configurations as in previous editions of the Standard; however, many of the zone designations have been revised (Figure 7). Minimum Design Loads and Associated Criteria for Buildings and Other Structures, ASCE/SEI 7-16, provides the most up-to-date and coordinated loading standard for general structural design. Example of ASCE 7-16 Sloped Roof Component & Cladding Zoning for 7 to 20 degree roof slopes. Comments posted to STRUCTURE website do not constitute endorsement by NCSEA, CASE, SEI, C3 Ink, or the Editorial Board. 311 29 wind loads on building appurtenances and other structures: main wind force ASCE 7‐16 Wind Provisions “How They Affect the Practicing Engineer” Donald R. Scott, P.E., S.E., F.SEI, F.ASCE Senior Principal, PCS Structural Solutions Chair, ASCE 7‐16 Wind Load Subcommittee Chair, NCSEA Wind Engineering Committee ASCE 7‐16 –Wind Provisions • The Washington Post 3) The wind speed-up effect shall be included in the calculation of the design wind loads by the factor Kzt. Printed with permissionfrom ASCE. Also, the technology available to measure the results of these wind tunnel tests has advanced significantly since the 1970s. Figure 6. See ASCE 7-16 for important details not included here. Figure 2. This study focused on the non-hurricane areas of the country and used a new procedure that separated the available data by windstorm type and accounted for changes in the site exposure characteristics at the recording anemometers. Yield stress = 36ksi 1.6 factor: Live, Soil Loads Allowed stress = 24ksi Load Combinations ASCE 7-05 ASCE 7-10 ASCE 7-16. Note this is only done if the conditions and locations of the structures meet all of the conditions specified above and within Section 26.8.1 as ASCE 7-16. Reprinting or other use of these materials without express permission of NCSEA is prohibited. This revision in zone designations was required because the values in zones around the roof in previous editions of the Standard were shown as having the same pressure coefficient, i.e., corners at the eave versus corners at the ridge have been found to have varying pressures. 3) The wind speed-up effect shall be included in the calculation of the design wind loads by the factor Kzt. This reduction was provided in the Commentary of previous editions of the Standard; however, it is being brought into the body of the Standard to facilitate its use. Example of ASCE 7-16 Figure 29.4-7 Excerpt for rooftop solar panel design wind loads.Printed with permission from ASCE. ASCE 7‐16 Wind Provisions “How They Affect the Practicing Engineer” Donald R. Scott, P.E., S.E., F.SEI, F.ASCE Senior Principal, PCS Structural Solutions Chair, ASCE 7‐16 Wind Load Subcommittee Chair, NCSEA Wind Engineering Committee ASCE 7‐16 –Wind Provisions • The Washington Post ASCE/SEI 7-16 contains a number of revisions in the wind load chapters of the stan-dard. To ASCE 7-16 for important details not included here that are located at higher elevations low-slope roof assem-bly in... 7-16 that affect the wind pressures on canopies attached to buildings with h ≤ 60 feet, 100,,! Roof component & cladding zoning for 7 to 20 degree roof slopes is be... 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