The 2018 International Building Code (IBC) has adopted the new ASCE 7-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures (Standard) and it is not just the title that is new. The 2018 IBC and the Standard should be widely adopted by 2019. Below are some of the highlights of the new wind provisions from the ASCE 7-16 Standard:
- New Updated Maps
- Based on new test data various regions have been revised.
- Ke Factor *New*
- The new factor, “adjust the velocity pressure to account for the reduced mass density of air as height above sea level increases” (July 2018 Structure Magazine). Most of our work at Lewis & Van Vleet, Inc (LVVI) has been in and around the Willamette Valley, therefore the Ke factor is 1.00. Some of our work has been in Bend, OR which has an elevation of 3,623 feet. In that region the wind would get reduced by a factor of approximately 0.86.
- Rooftop Equipment
- The ASCE 7-10 limited rooftop equipment to a mean roof height to h < 60 feet. ASCE 7-16 has eliminated this limitation thus making it acceptable for buildings for all heights. It should be noted that if an office building is designed for Risk Category II, but the equipment on the roof also serves a facility next door that is a Risk Category IV, then the equipment is design for Risk Category IV.
- Rooftop Solar Panels and Wind
- The past Standard did not have a provision specific to solar panels on roof. The new ASCE 7-16 Standard now provides guidance to the design of wind effects on solar panels. They have provided two methods for design – 1. low-sloped roofs (slope < 7 degrees) and 2. any roof slope.
- For h < 60 feet – Roof Pressure Coefficients and Attached Canopies round out the new and revised provisions.
Safety and reliability has been improved with these new provisions. The engineer will need to assess their previous design methods and adopt those set forth in the upcoming Standard.
Lewis & Van Vleet, Inc. worked with Clark/Kjos Architects, LLC as the structural consultant. The official ribbon-cutting ceremony and open house was on May 16th. From the news article from KTVZ News,
“St. Charles Family Care in La Pine will serve the community of La Pine and nearby underserved communities, including Sunriver, Gilchrist, Crescent, Chiloquin, Chemult, Christmas Valley, Silver Lake and Fort Rock.
Along with expanding services, the clinic will provide a medical home for the region that coordinates care throughout St. Charles Health System with the central point of access — primary care physicians — close to home.
“We’re so excited to celebrate the grand opening of our new clinic,” said John Weinsheim, president of St. Charles Medical Group. “This clinic, which will provide primary care, Immediate Care, radiology, lab, occupational and specialty services, will be a medical home to south county residents.””
Completed. The Powell Apartments on SE 37th and Powell in Portland, Oregon. A three story multi-family complex of all wood construction. One of the unique features was trying to install the wood press plate trusses over power lines. We worked on the project with WDC and Studio 3 Architecture.
Our current commercial project under construction, Cedar Creek Plaza, is six new retail shops in Sherwood, Oregon along Hwy 99. It is the development/construction project of Deacon Development, LLC. From their website:
“Cedar Creek Plaza is approximately 46,000 sf of retail and medical use with an additional 76,000 sf of future development potential, envisioned to be a hotel. It is located in Sherwood, one of the fastest growing cities in Oregon and in the world-renowned wine country of the Willamette Valley. This location has high visibility, is accessible from the highway and offers exposure to high incomes.“
The architect for the project is Novak Architecture.
The St. Charles Family Care will open soon in La Pine, Oregon. It is a project that we worked on with Clark/Kjos Architects. They have provided some of the construction pictures that we have previously posted. General contractor is/was Sunwest Builders.