降伏耐力のばらつきを考慮した全体崩壊メカニズム骨組の設計

概要

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A weak-beam-strong-column philosophy is generally recommended for the design of earthquake-resistant multistory structures, because the associated overall collapse mechanism exhibits a high ductility against a strong earthquake. A simple method for designing a weak-beam-strong-column structure is proposed using the concept of column overdesign factor. Some uncertainty factors, however, may impair the overall collapse mechanism, such as randomness in members' yield strengths, randomness in earthquake motions, and randomness in massdistribution over the height of the building. Monte Carlo simulations on the static and dynamic performance of a 6-story rigid plane frame designed by the proposed method showed that the randomness in the yield strengths has a predominant influence on the failure mechanism and consequently on the system ductility. In practice, weak-beam-strong-column structures will be realized only when the randomness in the yield strengths is reduced by means of a higher quality control in manufacturing and construction processes, otherwise a considerably high margin should be provided to column strengths. And this suggestion must be more emphasized for tall buildings with more stories in which it is less probable that the overall collapse mechanism shows the minimum load factor under the uncertainty of member strengths.
社団法人日本建築学会の論文
1989-07-30