Probabilistic predictor of seismic demand on SMRF based on natural-period-dependent spectrum intensity

Autor: Yasuhiro Mori, Taishi Furukawa
Rok vydání: 2021
Předmět:
Zdroj: Structural Safety. 89:102040
ISSN: 0167-4730
DOI: 10.1016/j.strusafe.2020.102040
Popis: The objectives of this study is to develop a framework for estimating the exceedance probability p ex of the maximum inter-story drift ratio (ISDR) at each story of an SMRF based on the previously proposed techniques for predicting the responses for a given ground motion, which comprises the use of the maximum displacement d max of the inelastic oscillator equivalent to the first mode of the original frame and takes into consideration a post-elastic first modal shape that would change as a function of d max of the oscillator. First, a simple technique for estimating p ex of the maximum displacement of the oscillators is proposed. It was found that the relationship between d max and the natural-period-dependent spectrum intensity SI μ can be modeled using a simple linear function. d max was then estimated as the intersection of the linear function and the integrated elastic response spectrum of a given ground motion. The post-elastic first modal shape changes complicated manner because of irregular formations of plastic hinges at the ends of members. Here, it is proposed that the p ex be approximated using a shifted-lognormal distribution function. The accuracy of the proposed method is investigated using five building models, and it is shown that a reasonable degree of accuracy can be obtained. Finally, the procedure for estimating the p ex values of the ISDR of the first inelastic mode is presented, and the p ex values of the total ISDR obtained on considering modal responses higher than the first are demonstrated.
Databáze: OpenAIRE
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