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Estimation of strength-reduction factors for elastoplastic systems: a new approach

✍ Scribed by Ordaz, M.; Pérez-Rocha, L. E.

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
161 KB
Volume
27
Category
Article
ISSN
0098-8847

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✦ Synopsis

A new rule is presented to estimate strength-reduction factors in single-degree-of-freedom elastoplastic oscillators, in which reduction factors depend only on displacement elastic spectra, so they are not an explicit function of structural period. It is found that the proposed rule yields good results when applied to accelerograms recorded in firm and soft soils, and for damping ratios of 2, 5 and 10 per cent of the critical. It is shown that the proposed reduction rule is more general than others previously published, and at least as accurate.

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This paper deals with the problem of model reduction based on an optimization technique. The objective function being minimized in the impulse energy of the overall system with unity, single-sided and doublesided weightings. A number of properties of the gradient flows associated with the objective