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INSTRUCTORS:
Don Scott, P.E., S.E., F.SEI, F.ASCE
Marc L. Levitan, PhD, F.SEI, A.M.ASCE
Shane Crawford, PhD
Tom Smith, AIA, RRC, F.SEI
Purpose and Background
Until recently, ASCE 7 and model building codes specifically excluded tornado hazards in the design of conventional buildings. Therefore, it is not surprising that our buildings and infrastructure perform poorly in tornadoes – given that they are not designed to resist tornadic loads. As a result, tornadoes kill more people in the U.S. than hurricanes and earthquakes combined, with most tornado fatalities occurring inside buildings. Additionally, tornadoes and tornadic storms cause more insured losses than hurricanes and tropical storms combined. The panelists will provide a brief overview of tornado hazards, the rationale for consideration of tornadoes in conventional engineering design, the latest science on tornadic winds/windbuilding or other structure interaction, and an overview of the new tornado load requirements in the ASCE 7-22 standard and the forthcoming 2024 International Building Code. Key changes to the ASCE 7-22 wind load provisions, which are incorporated into the tornado loads, will also be addressed. The new tornado requirements represent nothing less than a paradigm shift in wind load design – one that will reduce damage from tornadoes as well as other windstorms across much of the central and southeast U.S. Tornado loads on several example buildings at locations across the country will be shown in comparison to wind loads, e.g., uplift loads on roofs can double or more. Impacts of the increased tornado loads on structural and on roof system selection and design will be discussed, along with highlights of an economic analysis examining the estimated cost impacts of the tornado load provisions.
Benefits and Learning Outcomes
Upon completion of this course, you will be able to:
- Demonstrate awareness of the recent and upcoming changes in practice requiring consideration of tornado loads for conventional buildings and other structures, along with the rationale for incorporation of tornado loads in ASCE 7-22 and the 2024 IBC.
- Assess the applicability of ASCE 7-22 tornado load requirements for site-specific buildings and other structures, including determination of design tornado speeds as a function of geographic location, building/facility footprint area, and Risk Category using the new ASCE 7 Hazards Tool.
- Explain the new tornado load requirements in ASCE 7-22 and how they differ from ASCE 7 wind load requirements, based on differences in tornadic versus straight-line wind and wind-structure interaction characteristics.
- Integrate into practice significant changes to wind load design caused by the new tornado load requirements, and impacts on loads, design of roof systems, and costs.
Assessment of Learning Outcomes
Learning outcomes are assessed by responding to the post-session survey. If the course is taken OnDemand, there will also be a 10-question multiple choice post-test.
Who Should Attend?
- Structural Engineers
- Civil Engineers
- Students
How to Earn your PDHs
This course is worth 1.5 PDH. To receive your certificate of completion, you will need to attend the live session and/or watch the recording(s) and complete the post-session survey. If the course is taken OnDemand, there will also be a 10-question multiple choice post-test.