Chapter
Apr 26, 2012
Modal Pushover Analysis for Unsymmetric Buildings
Publication: Structures Congress 2005: Metropolis and Beyond
Abstract
The modal pushover analysis (MPA) procedure for estimating seismic demands is extended to unsymmetric-plan buildings. In the MPA procedure, the seismic demand due to individual terms in the modal expansion of the effective earthquake forces is determined by nonlinear static analysis using the inertia force distribution for each mode, which for unsymmetric buildings includes two lateral forces and torque at each floor level. These "modal" demands due to the first few terms of the modal expansion are then combined by the CQC rule to obtain an estimate of the total seismic demand for inelastic systems. The MPA estimates of seismic demand for torsionally-stiff and torsionally-flexible unsymmetric systems are shown to be similarly accurate as they are for the symmetric building; however, the results deteriorate for a torsionally-similarly-stiff unsymmetric-plan system.
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Copyright
© 2005 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Building design
- Continuum mechanics
- Design (by type)
- Dynamics (solid mechanics)
- Earthquake engineering
- Earthquakes
- Engineering fundamentals
- Engineering mechanics
- Forces (type)
- Geohazards
- Geotechnical engineering
- Lateral forces
- Nonlinear analysis
- Seismic design
- Seismic effects
- Seismic tests
- Solid mechanics
- Structural analysis
- Structural engineering
- Tests (by type)
- Torsion
Authors
Affiliations
Department of Civil & Environmental Engineering, California Polytechnic State University, San Luis Obispo, CA 93407. E-mail: [email protected]
Department of Civil & Environmental Engineering, University of California, Berkeley, CA 94720. E-mail: [email protected]
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