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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
Significant changes to how seismic evaluations and retrofits will be carried out are just around the corner with the pending publication of the 2017 edition of ASCE/SEI 41 Seismic Evaluation and Retrofit of Existing Buildings. This webinar highlights the most significant updates to the provisions including specific discussions on revisions to the basic performance objective for existing buildings, revised Tier 1 and Tier 2 procedures, significant linear and nonlinear analysis provision changes, nonstructural provision changes, and changes to the criteria for steel and concrete columns.
Primary Discussion Topics
- Revisions to the basic performance objective for existing building
- Changes to force-controlled element forces in linear procedures
- Significant updates to the nonlinear dynamic procedure
- Updates to the tier 1 and tier 2 deficiency-based procedures
- High level summaries of changes to the construction material specific provisions in ASCE 41-17
Learning Outcomes
- Identify changes to the BPOE and explain how they may affect seismic evaluation and retrofit in different parts of the country
- Identify the reasons for the updated tier 1 and tier 2 procedures
- Explain how and why demands on force-controlled actions are being changed for both linear and nonlinear procedures
- Explain why the nonlinear response history analysis procedure was updated and identify what is different from the previous edition's
- List the changes to the material provisions, including significant revisions to how steel and concrete column modeling and acceptance criteria will affect evaluation and retrofit
Webinar Benefits
- Find out the coming changes to a widely used national consensus standard from those who led the development of it
- Avoid using a seismic hazard that under-predicts the hazards your building site faces
- Examine how to specify target seismic performance objectives for existing buildings that you are tasked with evaluating
- Develop an understanding on how to apply the nonlinear dynamic procedure to better assess an existing building
- Learn why using the most recent edition of the standard will provide better prediction of steel frame building performance
- Determine the most appropriate performance objective for nonstructural components
- Become aware of changes in the evaluation procedures for unreinforced masonry buildings
Intended Audience
- Structural engineers
- Building officials
- Architectural engineers
- Research professors
Webinar Outline
- Introduction to the updated standard
- Performance objective revisions
- Issue with BPOE in the central & eastern US
- Tier 1 & 2 BSE-2e performance objective revisions
- Nonstructural position retention performance level
- Linear analysis changes
- Force-controlled component forces
- Out-of-plane forces
- Nonlinear dynamic analysis changes
- Ground motion selection and scaling
- Unacceptable response
- Force-controlled actions
- Soil structure interaction revisions
- Tier 1 screening revisions
- Tier 2 revisions
- Steel frame provision updates
- Concrete provision updates
- Unreinforced masonry provision updates
- Wood frame provision updates
- Nonstructural provision updates