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INSTRUCTOR:
Marc Levitan, Ph.D.
Purpose and Background
Until now, tornado hazards have not been considered in the design of conventional buildings, despite the fact that tornadoes and tornadic storms cause more fatalities and insured losses than hurricanes and tropical storms. This gap is addressed for the first time in ASCE 7‐22, which includes requirements for tornado loads. The webinar provides an introduction and overview of the new tornado provisions in ASCE 7‐22, along with background on the need for such requirements and their development. Participants will gain a basic understanding of tornado hazards, the ASCE 7‐22 tornado load methodology, significant differences between procedures for determination of wind loads and tornado loads, and changes to load combinations including tornadoes.
Benefits and Learning Outcomes
Upon completion of this course, you will be able to:
- Identify key properties and defining characteristics of tornadoes and associated hazards and their effects on buildings
- Describe the scope and limitations of ASCE 7‐22 tornado load requirements
- Determine site‐specific tornado speeds as a function of geographic location, building/facility footprint area, and Risk Category
- Evaluate the applicability of ASCE 7‐22 tornado load requirements for site‐specific buildings and other structures
- Develop a basic understanding of the new tornado load requirements in ASCE 7‐22
- Learn about the new ASCE 7 Hazards Tool and how to determine site‐specific tornado speeds
Assessment of Learning Outcomes
Students' achievement of the learning outcomes will be assessed via a short post-assessment (true-false, multiple choice and fill in the blank questions).
Who Should Attend?
- Civil engineers
- Structural engineers
- Architectural engineers
- Forensic engineers
- Engineering Consultants
- Architectural consultants
- Designers
- Principals
- Building Officials
- Risk Managers
Outline
- Tornadoes 101 - definition; formation; frequency; location; losses of life and property
- Tornado Hazards and Tornado‐Structure Interaction - tornadic winds, updrafts; atmospheric pressure change (APC); wind‐borne debris, laydown hazards; falling debris hazards; collapse hazards
- Overview and Scope of ASCE 7‐22 Tornado Requirements - Overview of the new Chapter 32 on Tornado Loads; applicability; limitations; organization; symbols and notation; permitted procedures; performance-based design
- Tornado Speed and Velocity Pressure - design tornado speeds and variation with building footprint size and shape; tornado velocity pressure exposure coefficient; velocity pressure equation; ASCE 7 Hazards Tool
- Tornado Load Coefficients and Equations - tornado directionality factor; gust effect factor; pressure coefficient adjustment factor; enclosure classification; debris impact protection; internal pressure coefficient; MWFRS and C&C design pressure equations; wind tunnel method
- Tornado Load Combinations - ASCE 7‐22 Chapter 2 load combinations including tornadoes
- Summary - review of main themes; where tornado loads are likely to control; additional resources
How to Earn your CEUs/PDHs
This course is worth .2 CEUs /2 PDHs To receive your certificate of completion, you will need to complete a short on-line post-test and receive a passing score of 70% or higher within 30 days of the course.
How do I convert CEUs to PDHs?
1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]