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INSTRUCTOR:  Michael O’Rourke, P.E., Ph.D., F.SEI

Purpose and Background

The webinar will review the changes to the Snow Load Provisions in ASCE 7-22. The next version of ASCE 7 will have many changes to the snow load provisions, likely the most since ASCE 7 was first published in 1988. Topics to be covered are new ground snow loads for the nation, the winter wind parameter for drift load estimation, thermal factors for recently increased levels of roof insulation, new width relations for windward drifts, drift reduction factors for large roof steps, effective fetch distance for roof steps in series and drift mitigation via snow capture walls.

Benefits and Learning Outcomes

Upon completion of this course, you will be able to:

• Explain the reasons for the new ground snow load values in ASCE 7-22
• Use the new winter wind parameter in drift load determination
• Explain the new provisions for snow capture walls and large step reduction factors – provisions that practitioners have requested in the past
• Determine if the ground snow loads in your region will increase or decrease
• Determine if the drift loads in your region will increase or decrease based upon the new winter wind parameter
• Explain the reasons for the big changes to the snow load provisions in ASCE 7-22
• Explain the influence of renovation triggered increases in roof insulation upon roof snow loading in general and the Thermal factor in particular
• Explain the height requirements for snow capture walls between an existing low roof and a new higher-level addition

Assessment of Learning Outcomes

Achievement of the learning outcomes will be assessed through a short post-test (true-false, multiple choice and fill in the blank questions).

Who Should Attend?

• Structural engineering
• Project engineering

Outline

• Ground Snow Loads in ASCE 7-22
• Drift Loads using the Winter Wind Parameter
• Width of Windward Drifts
• Reduction Factor for Large Roof Steps
• Mitigation using Snow Capture Walls
• Effective Fetch Distance for Roof Steps in Series
• Thermal Factors for Roofs with Modern Insulation Levels

How to Earn your CEUs/PDHs and Receive Your Certificate of Completion

This course is worth .1 CEUs/1 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 60 days of the course.