Probabilistic advantage of vibrational redundancy in earthquake-resistant steel frames
✍ Scribed by J. Iyama; H. Kuwamura
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 428 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0143-974X
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✦ Synopsis
Steel frames are, in general, indeterminate and thus they do not necessarily fail when some elements constituting the system are subjected to fracture or buckling during a severe earthquake. The purpose of this paper is to assess the advantage of such redundancy inherent in indeterminate structural systems in a probabilistic sense. Two structural models are introduced to clarify the benefits of vibrational redundancy. One is a dual system composed of two parallel subsystems which have different natural periods. The other is a single system composed of a single subsystem. The former is exemplified by a moment-resisting frame associated with bracing, while the latter by a bracing system. It is demonstrated numerically that the dual system can survive with a higher degree of safety than the single system under the uncertainty condition that earthquake ground motions which hit the systems have random spectral properties.