Seismic Fragility Analysis for Base-Isolated Structure

Hirata, Ken‐ichi; Ootori, Yasuki; Somaki, Takahiro

doi:10.3130/aijsx.452.0_11

Cited by 3 publications

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“…In the early seismic fragility analysis, the seismic fragility curves were usually represented as functions of the peak ground acceleration (PGA) [3]. Hirata et al [4,5] tried to express the seismic fragility as a function of the peak ground velocity (PGV) as well as of the spectral pseudovelocity for base-isolated reactor structures. Dimova and Hirata [6] investigated several seismic intensity parameters, including PGA, PGV and the pseudovelocity spectrum (PVS) for a seismic fragility analysis of building structures.…”

Section: Introductionmentioning

confidence: 99%

PDF interpolation technique for seismic fragility analysis of bridges

Kim

Kushiyama

2007

Engineering Structures

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Section: Introductionmentioning

confidence: 99%

PDF interpolation technique for seismic fragility analysis of bridges

Kim

Kushiyama

2007

Engineering Structures

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“…For base isolated fast breeder reactor structures Hirata et al [12,15] expressed the seismic fragility as a function of the peak ground velocity < . Hirarta et al evaluated the conditional probability of failure for base-isolated reactor building using spectral pseudovelocity S (¹"2.0 s) as the ground motion intensity parameter [14]. The considered ¹"2.0 s is the fundamental period of the reactor corresponding to tangential sti!ness of the bi-linear load}displacement relationship of isolators after yielding, which is considered to be equivalent sti!ness in the region where the ductility factor is considerably large.…”

Section: Selection Of Seismic Intensity Parameter For Fragility Analysismentioning

confidence: 99%

“…The e!ect of modelling uncertainty herewith is not taken into account. When needed, it could be expressed in the manner, for example as a present con"dence interval [3,14].…”

Section: S (E)"r/s(e)mentioning

confidence: 99%

Simplified seismic fragility analysis of structures with two types of friction devices

Dimova

Hirata

2000

Earthquake Engng. Struct. Dyn.

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SUMMARYThis paper presents a method and results of seismic fragility estimation of frame structures with friction devices and with friction devices and restrictors. The seismic intensity parameter, de"ned as the mean value of the pseudovelocity spectrum in a speci"ed periods band, is proved to allow the use of linear regression analysis of the response parameters of the considered non-linear structures on seismic intensity. A simpli"ed method of fragility estimation is proposed, based on the concept of &mean seismic excitation' and linear regression of the seismic response parameters on seismic intensity parameter. The key risk contributors for the system with friction devices and for the system with friction devices and restrictors are identi"ed on the basis of the fragility analysis, and recommendations for improvement of the seismic response of the respective systems are derived. The results of the fragility study show that when the initial &bare' frame is retro"tted by rigidly connected bracings the e!ect is much lower than in the case of connecting the bracings by friction devices and especially by friction devices and restrictors.

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Assessment of Seismic Fragility of Structures with Consideration of the Quality of Construction

Dimova

Negro

2006

Earthquake Spectra

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A method for the assessment of the seismic vulnerability of structures with consideration of the quality of construction is demonstrated on the example of single-story, industrial reinforced-concrete frames designed according to Eurocodes. Two experimental models of the prototype are considered: a structure erected under strict control of the workmanship and a structure with significant deficiencies in the arrangement of the reinforcement. Fragility analysis is performed for four damage states. The epistemic and aleatory uncertainties in the seismic demand and capacity for each damage state are determined. Among the considered different errors in the assembling of the reinforcement, the tying of the stirrups and the arrangement of the reinforcement in the beam-column joints are identified as critical deficiencies, which should be strictly controlled. The damage states of the studied structures are related to the European Macroseismic Scale and it is illustrated that the quality of construction does influence considerably the observed macroseismic intensity.

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Seismic Fragility Analysis for Base-Isolated Structure

Cited by 3 publications

References 0 publications

PDF interpolation technique for seismic fragility analysis of bridges

PDF interpolation technique for seismic fragility analysis of bridges

Simplified seismic fragility analysis of structures with two types of friction devices

Assessment of Seismic Fragility of Structures with Consideration of the Quality of Construction

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