As described above, revised roof construction details to accommodate increased roof wind pressures include revised fastener schedules for roof sheathing attachment, revised sheathing thickness requirements, and framing and connection details for overhangs at roof edge zones.. One method applies specifically to a low-sloped roof (less than 7 degrees) (Figure 5) and the second method applies to any roof slope where solar panels are installed parallel to the roof. Before linking, please review the STRUCTUREmag.org linking policy. Allows the user to define roof slopes in terms of degrees or as a ratio (x:12) and to input all salient roof dimensions. View More View Less. ASCE 7-16 FORTIFIED Wind Uplift Design Pressure Calculator for Residential Roof Coverings (2:12 or Greater)1,2,3. Before linking, please review the STRUCTUREmag.org linking policy. Printed with permission from ASCE. We now follow the steps outlined in Table 30.3-1 to perform the C&C Calculations per Chapter 30 Part 1: Step 1:We already determined the risk category is III, Step 3: Determine Wind Load Parameters Kd = 0.85 (Per Table 26.6-1 for C&C) Kzt = 1 (There are no topographic features) Ke = 1 (Job site is at sea level) GCpi = +/-0.18 (Tabel 26.13-1 for enclosed building), Step 4: Determine Velocity pressure exposure coefficient zg = 900 ft [274.32] (Table 26.11-1 for Exposure C) Alpha = 9.5 (Table 26.11-1 for Exposure C) Kh = 2.01*(40 ft / 900 ft)^(2/9.5) = 1.044, Step 5: Determine velocity pressure qz = 0.00256*Kh*Kzt*Kd*Ke*V^2 = 0.00256*(1.044)*(1)*(0.85)*(1.0)*(150^2) = 51.1psf. The component and cladding pressure coefficients, (GCp), for roofs on buildings with an h < 60 feet, have been revised significantly in ASCE 7-16. 0: 03-02-2023 by Steven Ray : ASCE 7-22,Table 12.2-1 SFRS confusion. Airfield Pavement Condition Assessment - Manual or Automated? The adjustment can be substantial for locations that are located at higher elevations. Our least horizontal dimension is the width of 100 ft [30.48] and our h is less than this value, so this criteria is met as well. Figure 2. Expert coverage of ASCE 7-16-compliant, wind-resistant engineering methods for safer, sounder low-rise and standard multi-story buildings Using the hands-on information contained in this comprehensive engineering Page 3/14 March, 04 2023 International Building Code Chapter 16 Part 3. Design Example Problem 1b 4. . 26.7.4.4 Components and Cladding (Chapter 30) Design wind pressures for components and cladding shall be based on the exposure category resulting in the highest wind loads for any wind direction at the site. Wind tunnel tests are used 10 predict the wind loads and responses of a structure, structural components, and cladding to a variety of wind c ditions. Table 26.9-1 ASCE 7-16 ground elevation factor. These pressures follow the normal ASCE 7 convention, Positive pressures are acting TOWARD the surface, and Negative Pressures are acting AWAY from the surface. Chapter 30 of ASCE 7-16 provides the calculation methods for C&C, but which of the seven (7) parts in this section do we follow? FORTIFIED Realizes Different Homes have Different Needs . Step 1: The Risk Category is determined from Table 1.5-1 [1] based on the use or occupancy of the building. Explain differences in building characteristics and how those differences influence the approach to wind design. Each of these provisions was developed from wind tunnel testing for enclosed structures. Level 2 framing: a. S2.02 grid F/1.7-3.3 - This is a teeter-totter . Simpson Strong-Tie Releases New Fastening Systems Catalog Highlighting Robust, Code-Compliant, and Innovative Product Lines, Simpson Strong-Tie Introduces Next-Generation, Easy-to-Install H1A Hurricane Tie Designed for Increased Resiliency and Higher Allowable Loads Using Fewer Fasteners, Holcim US Advances Sustainability Commitment with Expansion of ECOPactLow-Carbon Concrete, Simpson Strong-Tie Introduces Titen HD Heavy-Duty Mechanically Galvanized Screw Anchor, Code Listed for Exterior Environments. Also, a small revision was made to the hurricane wind speeds in the Northeast region of the country based upon updated hurricane models. For the wall we follow Figure 30.3-1: For 10 sq ft, we get the following values for GCp. The other determination we need to make is whether this is a low rise building. The tool provides hazard data for all eight environmental hazards, including wind, tornado, seismic, ice, rain, flood, snow and tsunami. Printedwith permission from ASCE. Using all of this criteria, we can then determine that the only two methods of Chapter 30 where we meet all criteria are Part 1 and 4 (see chart). A Guide to ASCE - Roofing Contractors Association Of South Florida We will first perform the calculations manually, and then show how the same calculations can be performed much easier using the MecaWindsoftware. Table 29.1-2 in the ASCE 7-16 [1] outlines the necessary steps to determining the wind loads on a circular tank structure according to the Main Wind Force Resisting System (MWFRS). Reference the updated calculations B pages 7 to 15. Consequently, wind speeds generally decrease across the country, except along the hurricane coastline from Texas to North Carolina. The new Ke factor adjusts the velocity pressure to account for the reduced mass density of air as height above sea level increases (see Table). Donald R. 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Each FORTIFIED solution includes enhancements . S0.01 - Please provide the wind pressure study and the components and cladding study in the permit submittal. Program incorporates all roof types and combinations defined in ASCE 7-05 or ASCE 7-10/16, Chapters 27-28. One new clarification is that the basic design wind speed for the determination of the wind loads on this equipment needs to correspond to the Risk Category of the building or facility to which the equipment provides a necessary service. The first method applies Network and interact with the leading minds in your profession. 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. In Equation 16-15, the wind load, W, is permitted to be reduced in accordance with Exception 2 of Section 2.4.1 of ASCE 7. The new roof pressure coefficients are based on data from recent wind tunnel tests and then correlated with the results from full-scale tests performed at Texas Tech University. The calculations for Zone 1 are shown here, and all remaining zones are summarized in the adjacent tables. Engineering Express 308 subscribers Understand the concepts & inputs for the Engineering Express ASCE 7 16- ASCE 7-10 Wall Components & Cladding Design Pressure Calculator. Example of ASCE 7-16 Risk Category II Hawaii effective wind speed map. ASCE 7-16's zone diagram for buildings 60 feet and less has a Zone 1' in the center of the roof area's field and is surrounded by Zone 1. Per ASCE 7-02 Code for Low-Rise, Enclosed Buildings with h <= 60' and Roof q <= 45. If we calculate the Component and Cladding wind pressure for an exterior wall of a building located in USA Zip Code 32837, we find the . Design Example Problem 1a 3. Other permitted options based on ASCE 7-16 include the 2018 IBC and the 2018 Wood Frame Construction Manual (WFCM). 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. Don and Cherylyn explained the significant changes to the wind maps and provisions in ASCE 7-16 including the differences between ASCE 7-10 and 7-16 low-rise components and cladding roof pressures. Additionally, effective wind speed maps are provided for the State of Hawaii. For gable and hip roofs, in addition to the changes in the number of the roof wind pressure zones, the smallest and largest effective wind areas (EWA) have changed. Don gave an excellent visual demonstration . STRUCTURE magazine is the premier resource for practicing structural engineers. Wind Loads on Rooftop Solar Panels (ASCE 7-16 Sections 29.4.3 and 29.4.4) New provisions for determining wind loads on rooftop solar panels have been added to ASCE 7-16. Skip to content. In first mode, wall and parapet loads are in Questions or comments regarding this website are encouraged: Contact the webmaster. Two methods for specific types of panels have been added.
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