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INSTRUCTOR: Garrett R. Hagen, S.E.
Purpose and Background
This webinar presents a focused review of the substantive revisions to concrete structural wall provisions in ASCE/SEI 41-23, developed primarily through the research documented in FEMA P-2208. The updates represent the most comprehensive overhaul of concrete wall modeling and acceptance criteria in ASCE 41 since its original publication.
The session explains the new strength-based wall classification framework, replacing earlier geometry-based approaches, and clarifying distinctions between flexure-controlled, shear-controlled, and shear-friction-controlled walls. The technical basis drawn from wall test databases is discussed, along with implications for evaluation and retrofit practice.
Key updates to wall effective stiffness provisions are reviewed, including revised equations for cracked stiffness and improved alignment with observed experimental behavior. The webinar also discusses changes to shear amplification, axial load effects, and flange participation, including interpolation rules for flanged walls.
The session further examines revised nonlinear modeling parameters and deformation acceptance criteria for concrete walls. Practical implications for linear and nonlinear procedures are emphasized, including how the new provisions affect evaluation outcomes, modeling decisions, and retrofit triggers. The presentation clarifies how the updated ASCE/SEI 41-23 wall provisions improve consistency, reduce unconservative classifications, and better align modeling assumptions with observed wall behavior.
Benefits and Learning Outcomes
Upon completion of this course, you will be able to:
- Describe the new strength-based classification framework for concrete structural walls in ASCE/SEI 41-23 and explain how it differentiates flexure-controlled, shear-controlled, and shear-friction-controlled behavior.
- Explain the revised shear and shear-friction strength provisions, including their technical basis and implications for evaluation results.
- Implement the updated modeling parameters and deformation acceptance criteria for concrete walls in both linear and nonlinear analysis procedures.
- Identify practical impacts of ASCE/SEI 41-23 wall updates on seismic evaluation outcomes for existing concrete buildings.
Assessment of Learning Outcomes
Students' achievement of the learning outcomes will be assessed via a short post-test exam involving true-false and multiple-choice questions.
Who Should Attend?
- Civil and structural engineers
- Building officials
- Building owners/mangers
- Federal, state, and city agencies
Outline
- Introduction & Context
- Wall Classification Overhaul
- Stiffness & Dynamic Shear Amplification
- Flexure-Controlled Wall Updates
- Shear-Controlled Wall Updates
- Shear-Friction-Controlled Wall Updates
- Q&A
How to Earn your CEUs/PDHs
This course is worth .1 CEU /1 PDH. To receive your certificate of completion, you will need to complete a short 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]
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