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Sponsored by ASCE Continuing Education and the Structural Engineering Institute (SEI).
INSTRUCTOR: Robert G. Pekelnicky, P.E., S.E., M.ASCE
Purpose and Background
Since its creation, ASCE 41 has employed an analysis methodology for earthquake forces different from ASCE 7. The ASCE 41 analysis procedures is a combination of displacement-based design and capacity-based design. There are four analysis procedures in the ASCE 41 standards, from a simple linear static procedure to a very complex nonlinear dynamic analysis using response history. This webinar focuses on the changes made to the linear and non-linear analysis procedures based on the 2017 update. The most significant changes relate to the way brittle force-controlled actions are addressed in both linear and nonlinear procedures.
Primary Discussion Topics
- Background of ASCE 41 analysis procedure
- Changes to force-controlled element forces in linear procedures for higher performance levels
- Changes to wall out-of-plane and wall to diaphragm anchorage forces
- Changes to the number of ground motions required for analysis
- How ASCE 41 defines an unacceptable response
- Changes to the computation of demands on force-controlled actions in nonlinear procedures
- Changes to soil-structure interaction procedures
Learning Outcomes
- Understand the reason why the committee chose to increase forces on force-controlled elements in linear procedures
- Describe what the reason for changes to the wall out-of-plane force equations was
- IIdentify four different types of unacceptable response in a nonlinear response history analysis
- Name the different classifications of force-controlled actions and identify a specific example of each
- Calculate the forces on force-controlled elements based on the results of a nonlinear response history analysis
- Learn about changes to the material provisions, including significant revisions to how steel and concrete columns are addressed
Webinar Benefits
- Explain how the modeling parameters and acceptance criteria in ASCE 41 are developed
- Avoid under-predicting demands on force-controlled elements when evaluating for life safety through immediate occupancy performance
- Identify the correct force-controlled action designation for different elements in typical buildings
- Prepare design-criteria to perform a nonlinear response history analysis
- Describe the different items that must be checked to confirm that each analysis run is acceptable
- Explain the two most significant differences in processing results for an evaluation for life safety and immediate occupancy performance
- Identify one example where including soil structure interaction will likely change the results of a seismic evaluation
Intended Audience
- Structural engineers
- Building officials
- Architectural engineers
- Research professors
Webinar Outline
- Introduction to the ASCE 41 analysis procedures
- Development of modeling parameters and acceptance criteria
- Displacement-based design
- M-factor development
- Changes to element backbone curve
- Linear analysis changes
- Force-controlled component forces
- Example of force-controlled change
- Out-of-plane forces
- Example of out-of-plane force change
- Nonlinear dynamic analysis changes
- Ground motion selection and scaling
- Unacceptable response
- What are critical, ordinary, and noncritical force-controlled actions
- Computation of forces on force-controlled actions
- Example demonstrating changes
- Soil structure interaction revisions