Chapter
Dec 8, 2023
Chapter 8
R, Cd, and Ω0 Factors
Publication: Designing to the Strongest Ground Motions
Abstract
The overstrength factor Ω0 and the deflection amplification factor Cd can vary from one building to another even if the buildings have the same lateral load resisting system. Also, the response modification factor R is very sensitive to the frequency composition of the ground motion. It is unreasonable to assume the same R for all ground motions. In addition, elastic analysis does not capture the true strength, deformability, and damping of a structure. R, Cd and Ω0 factors are used to mitigate the shortcomings of an elastic analysis, but these factors are arbitrary. Collapse-proof seismic design should be carried out by using true capacities and true demands without the use of R, Cd and Ω0 factors.
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Information
Published In
Designing to the Strongest Ground Motions
Pages: 135 - 144
Copyright
© 2023 American Society of Civil Engineers.
History
Published online: Dec 8, 2023
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ASCE Technical Topics:
- Continuum mechanics
- Deformation (mechanics)
- Design (by type)
- Displacement (mechanics)
- Dynamic loads
- Dynamics (solid mechanics)
- Earthquake engineering
- Elastic analysis
- Engineering fundamentals
- Engineering mechanics
- Geotechnical engineering
- Geotechnical investigation
- Ground motion
- Lateral loads
- Load factors
- Seismic design
- Solid mechanics
- Structural analysis
- Structural behavior
- Structural design
- Structural dynamics
- Structural engineering
- Structural mechanics
- Structural strength
Authors
Affiliations
Praveen K. Malhotra, Ph.D., P.E.
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