GAF is happy to share our website content with you through our free media sharing service. In the 2009, 2012, 2015, and 2018 versions of the IBC, for wind resistance of nonballasted roofs, the codes state that built-up, modified bitumen, adhered or mechanically attached single-ply roof systems, metal panel roof systems applied to a solid or closely fitted deck and other types of membrane roof coverings shall be tested in accordance with FM 44746, UL 5807, or UL 18978. Photo detail for ASCE 7-10 Wind Speed Map: Title: ASCE 7-10 Wind Speed Map Date: September 13, 2018 Size: 2548kB Resolution: 4300px x 3062px Download Image. © Copyright 2018 SE Solutions, LLC (providers of SE University) | Website by, SE University, Provided by SE Solutions, LLC, Continuing Education Requirements by State, Applied Technology Council’s (ATC) WINDSPEED BY LOCATION, “SEU Speaker Inspires” Organization of the Month: Harvest Hope, “SEU Speaker Inspires” Organization of the Month: World Wildlife Fund, “SEU Speaker Inspires” Organization of the Month: Doctors without Borders, “SEU Speaker Inspires” Organization of the Month: Structural Engineers 2050 Commitment Program SE2050. This three-part webinar series discusses how to use the wind load provisions of ASCE 7-16 Minimum Design Loads for Buildings and Other Structures. Select roof systems that have been tested in accordance with code-approved test methods by accredited testing laboratories. Conceptually, the goal is to determine the design wind loads, then select the appropriate roof system with a tested resistance greater than the design wind loads.  Overall, the new improvements made to the ASCE 7-16 wind provisions will result in more accurate reflections of the wind speeds being witnessed at various anemometer locations throughout the United States. Wind Loads are important consideration in structural engineering in the design of a structure. El Paso, TX, “Feedback I’ve been getting from others (in my office) is that these seminars are excellent, not at all like the standard seminars that we have seen from others. Addition of a new Classification: “Partially Open Building” Wind Maps for Hawaiian Islands added; New Wind map for Risk Category IV added ASCE 7-16: Changes to Wind Calculations for Rooftop Solar Joe Cain, P.E. Wind Examples ASCE 7-10/ ASCE 7-16 Illustration of Calculations Meca Enterprises, Inc. 836 West Jasper St. Roof systems that have the tested capacity to resist calculated wind loads can be found in approval listings (e.g., UL, FM). This is a beta release of the new ATC Hazards by Location website. Asce 7 Wind Map ASCE 7-16 Wind Load Provisions Tools Of The Trade: Wheatland Wind Load Fence Post Size ASCE 7 10 To 7 16 Changes For Glass & Glazing Design. However, the factors selected by a conservative owner (e.g., choosing Partially Enclosed) also have an effect on the design wind loads. The loads acting on a roof must be calculated in order to select a roof system that has the necessary capacity (i.e., wind uplift resistance). The web based format is very cost-effective and beneficial as it allows our staff to attend each session in our own conference room and have a concurrent open discussion about how best to utilize the information presented.”, ~Donald G. Corson, P.E. Shaded (Special Wind Region) areas, mountainous terrain, gorges, and ocean promontories should be examined for unusual wind conditions. Before we get into a discussion about the wind design process, it's appropriate to discuss the requirements in the building code. Dates and registration coming soon. . What Wind Speed Should I Use For My Project?  Since ASCE had not made changes to the non-hurricane wind speeds since 7-95, there was a significant increase in new anemometer locations and data gained from these locations. These are shown in Figure 5. Note: This blog is not going to try to explain the difference between ASD and Strength Design loads. Testing laboratories that have listings of rated roofing assemblies include Underwriters Laboratories and FM Approvals. This presentation will provide the background for the changes and an overview of the... Speaker: Matthew Rechtien, PE, Esq Walter P. Moore   Handout and registration emails for this session will be sent to SE University companies on Friday, February 5th. The first step is to determine velocity pressure; the second step is to use velocity pressure to determine design wind loads for roof zones (e.g., field, perimeters, and corners). Minimum Design Wind Loads for the respective direction according to ASCE/SEI 7‑16 27.1.5; Case 1: Full design wind pressure acting on the projected area perpendicular to each principal axis of the structure, considered separately along each principal axis. There are a number of factors that determine the design wind uplift loads for the field, perimeter, and corners of a roof. Brookfield, WI, “SE University has become an integral part of American Structurepoint’s training and continuing education program. Simplifying the Complicated Process of Wind Design for Roof Systems. Exposure D also applies where the ground surface roughness immediately upwind of the site is B or C, and the site is within a distance of 600 ft. or 20 times the building height, whichever is greater, from an Exposure D condition. Ground Elevation Factor New. Exposure D is applicable where Surface Roughness D prevails in the upwind direction for a distance greater than 5,000 ft. or 20 times the building height, whichever is greater. Thus when ASCE … Each version of ASCE 7 uses a variation of the above equation. Sign up to receive the latest trends and insights for you. For more in-depth information about determining wind loads, read this blog. Enter your email address to subscribe to the GAF ProBlog and receive notifications of new posts by email. The series will cover the basics of wind engineering including the atmospheric and aerodynamic effects of wind on buildings. What is a Ridge Vent, and When Is One Used? Select a roof system with a tested capacity that meets or exceeds the design wind loads.  Don covered the changes to the new wind speed maps and explained how to determine the design wind speed. Exposure C is applicable for all cases where Exposure B and D do not apply. Please complete the information below. Key Definitions • DESIGN PRESSURE, P: (ASCE/SEI 7-10, same at 7-16) Equivalent static pressure to be used in the determination of wind loads for buildings • EAVE HEIGHT, h e: (ASCE/SEI 7-10, same at 7-16) The distance from the ground surface adjacent to the … The handout email for this session will be sent to SE University companies on Friday, January 8th. is due to the kinetic energy contained in moving air, which is a function of wind speed and the density of air. Using "Partially Enclosed" as the building type results in an increase of about one third in the design wind pressures in the field of the roof versus an "Enclosed" or "Partially Open" building—all other factors held equal. Recognizing how a safety factor is included in the approval listing is critical to ensuring an appropriate roof system is selected and installed. ASCE 7-05 uses Occupancy Category to determine the value to use for the Importance Factor. In November 2018, Don Scott, SE, from PCS Structural Solutions, presented ASCE 7-16 Wind Provisions – Changes Affecting the Design Provisions. Carmel, IN. The tested roof systems are found in approval listings. Effective wind area is the tributary area for the element being considered, and 10 sq. Exposure Category is based on the roughness of a building's nearby terrain.  The first option is the Applied Technology Council’s (ATC) WINDSPEED BY LOCATION website which available free of charge. The final wind speed map used in ASCE 7-98 was developed using design =V V 500 / 1.5 . 2020 has been a year of monumental change, pushing many companies to consider how they can be better, how they can do things differently, and—most importantly—how they can help.Corporate social responsibility (CSR) efforts allow GAF to bring about meaningful change in the communities it serves and within its own company. C1.3.1.3 of ASCE 7-10 to Section 1.3.1.3 of ASCE 7-16. Approval listings are maintained by various entities, such as government agencies, testing laboratories, and even a trade association. ASCE 7-16 also revised how the dimensions of the zones are sized; it is based on a building's height. Speaker: Kim Olson, PE Steel Tube Institute AISC 360, Chapter K underwent a significant change in the 2016 Specification. FM Approvals, Underwriters Laboratory, Intertek, NEMO, PRI, and others can perform testing—according to the code-approved test methods—that can be used to determine a roof system's capacity. The Importance Factor was absorbed into the wind maps, which means for ASCE 7-10 and ASCE 7-16, the Velocity, V, is adjusted within the wind speed maps. It has given us the flexibility to meet other obligations while keeping our technical development up to date in engineering topics as well as BIM. This is where much of the concern with ASCE 7-16 lies—the increase in the External Pressure Coefficients—and how the increases will affect design wind pressures. The values for External Pressure Coefficients have been significantly increased in ASCE 7-16. The location of the building within the United States tells us two things which must be determined in specific order. The 2018 IBC, in Section 1603, Construction Documents, states: The 2018 IBC further states, in Section 1603.1.4, Wind design data that the following is to be included on construction documents. Speaker: Ashley Cagle, PE, SE WoodWorks Handout and registration emails for this session will be sent to SE University companies on Friday, April 2nd. 209 ... COMMENTARY TO STANDARD ASCE/SEI 7-16 ASCE 7 addresses these speed-up effects by applying a multiplier to account for topography in the velocity pressure calculations. Don't mix and match methods; for instance, don't use the wrong wind map with the online application that you are using. Figure 4 shows possible roof-zone configurations based on ASCE 7-16.  The second option is ASCE 7 HAZARD TOOL which is available to registered members. This process results in Design Wind Pressures for each roof zone and determines the dimensions for each of the zones (although not discussed in here). Speaker: Aldo E. McKay, PE Protection Engineering Consultants   Handout and registration emails for this session will be sent to SE University companies on Friday, March 5th. Are you familiar with the changes to the wind provisions in ASCE 7-16? to ASCE 7-16 The wind pressure on building surfaces . Therefore, step one is to determine the loads acting on the roof of a specific building. Chair, SEIA Codes & Standards Working Group David Banks, PhD, P.Eng ... ASCE 7-16 Wind Speed Maps Revised (again) • Risk Category II • Mean Recurrence Interval (MRI) 700 years) • ASCE 7-16 wind speed Purpose and Background. Date change due to speaker availability – Session will also be rebroadcast on January 13th Speaker: Kim Olson, PE Steel Tube Institute AISC 360, Chapter K underwent a significant change in the 2016 Specification. McComas Engineering I wanted to take a minute to explain some of the major changes that occurred in ASCE 7-16. These classifications determine the values to use for the Internal Pressure Coefficient, GCpi. . 2020 was a tumultuous year, full of unknowns and adjustments—some natural and others forced by the pandemic. And lastly, SPRI sponsors the Directory of Roofing Assemblies (DORA) which is an online database of tested assemblies. The registration email will be sent on Tuesday, January 12th. In the end, the design architect's responsibility is to provide the necessary design wind loads; the manufacturer is responsible for testing roof systems in order to determine wind uplift capacity (See Determining Resistance, below); and the roofing contractor is responsible for proper installation that follows the construction documents and installation instructions. All of the previously discussed assumptions and selections and characterizations of the building are used to determine the Velocity Pressure for a roof project. Wind ASCE 7-10 v ASCE 7-16 • Except in hurricane areas, wind speeds have reduced by about 10% – More weather stations available now – Increased forestation & urbanization – Reliabilities of old maps “not right” • At high altitude locations wind pressures can be … Don offered two permitted web based tools that may be used to access wind speed data for various locations in the United States. Don was able to provide much insight as to what went into the changes to the wind speed maps and roof pressure coefficients. The primary method for determining a roof system's wind uplift resistance (aka, capacity) is through physical testing. The equation to determine velocity pressure varies slightly in ASCE 7-05, ASCE 7-10 and ASCE 7-16.  He also presented the changes to the roof pressure coefficients, and explained the effects of the new Elevation Factor. Eventually, we will all use ASCE 7-16 as the basis for determining design wind loads for our roofs. It's important to recognize there are two basic steps used to determine design wind pressures acting on a roof. Research and experience has shown that wind speeds can increase significantly due to topographic effects. ASCE 7-10 and 7-16 incorporates Risk Category (i.e., importance factor) into the wind speed maps, and that is why there are 3 maps in ASCE 7-10, and 4 maps in ASCE 7-16.  The new maps now reflect more regional variability in extreme wind climates.  Wind speeds in the great plains remain unchanged, but for the rest of the country wind speeds have decreased, most significantly along the west coast. The key difference being that FM did not adopt the wind maps utilized by ASCE 7-16 and the 2018 International Building Code. Ground MOTION, LONG-PERIOD TRANSITION, and even a trade association new technologies and products, K! Special wind Region ) areas, mountainous terrain, gorges, and a. 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