More Efficient Seismic Loading for Multidegrees of Freedom Structures
Publication: Journal of Structural Engineering
Volume 132, Issue 10
Abstract
In the equivalent-static-force procedure, the heightwise distribution of seismic load is implicitly related to the linear dynamic response. However, this contradicts the fact that structures undergo large nonlinear deformation during severe earthquakes. Hence, the question arises, how should the lateral loading pattern in seismic design be modified to ensure that the ductility demands are the minimum? This technical note addresses this question in detail. The shear and frame building models of multistory structures have been studied. Employing a new assessment criterion, the adequacy of various distribution patterns is examined, and a more efficient pattern is introduced. It has been shown that for any given earthquake, there can be found a unique strength distribution pattern that leads to the most uniform distribution and the least amount of ductility demand.
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Acknowledgment
The support provided by the Civil Engineering Department of Sharif University of Technology is gratefully acknowledged.
References
Karami Mohammadi, R. (2001). “Effects of shear strength distribution on the reduction of seismic damage of structures.” Ph.D. thesis, Sharif Univ. of Technology, Tehran, Iran.
Moghaddam, H. (1996). Earthquake engineering, 1st Ed., RTRC, Tehran, Iran.
Moghaddam, H., and Esmailzadeh Hakimi, B. (1999). “On the optimum seismic loading of multistory structures.” Proc., 3rd Int. Conf. of Seismology and Earthquake Engineering, Int. Institute of Earthquake Engineering, Tehran, Iran, 669–676.
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© 2006 ASCE.
History
Received: Dec 4, 2001
Accepted: Oct 25, 2005
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Sashi K. Kunnath
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