Dynamic Shakedown of Structures under Repeated Seismic Loads
Publication: Journal of Engineering Mechanics
Volume 121, Issue 12
Abstract
Elastic, perfectly plastic structures are considered under the action of repeated short-duration exitations of seismic type acting in an unknown time sequence, but belonging to a given polyhedral excitation domain. The basic excitations (vertices of the polyhedron) are chosen as discrete-spectrum waves each with frequencies coincident with the first natural frequencies of the structure, and amplitudes related to the ground features and earthquake intensity (according to the Kanai and Tajimi filter model) in such a way that every admissible excitation—obtained as a linear convex combination of the basic ones—has a maximum power not exceeding a given value. In the framework of unrestricted dynamic shakedown, the classic shakedown theorems are suitably cast and used for establishing alternative methods for the computation of the shakedown limit load multiplier. Considerable computational savings are obtained substituting the preceding basic excitations with single-frequency waves. Particular attention is devoted to bending frame structures. A numerical example is presented.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 121 • Issue 12 • December 1995
Pages: 1306 - 1314
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Dec 1, 1995
Published in print: Dec 1995
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