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

Dimova, Svetlana; Hirata, Ken‐ichi

doi:10.1002/1096-9845(200008)29:8<1153::aid-eqe961>3.0.co;2-y

Cited by 36 publications

(11 citation statements)

References 17 publications

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“…For the local collapse states, non-cumulative indicators in terms of displacement, cumulative indicators in terms of energy, and / or mixed indicators (a combination of both groups of indicators) can be used. For instance, Shinozoka's ductility ratio [16], Dimova's stories drift [17], and Ang and Park's collapse indicators by Karim and Yamazaki [18] can be mentioned. Among these introduced indicators, the stories drift or the maximum inter-story displacement ratio are related to the non-cumulative local indicators which have been used by numerous scholars [19].…”

Section: Deterioration States and Criterions Of The Structural Collapsementioning

confidence: 99%

Efficiency of near-fault ground motion pulses to evaluate seismic performance of the SMRF Systems

Mobinipour¹,

Pourzeynali²

2019

J. vibroeng.

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Earthquake accelerograms recorded in the near-fault regions have special characteristics including the long-period pulse in velocity records as well as high frequency content in acceleration records. In the present study, by using a wavelet analysis, the long period pulses exist in the velocity records of 28 near-fault ground motions, selected from the PEER NGA database, were first separated from the original records. Subsequently, an incremental non-linear dynamic analysis (IDA) was conducted to evaluate the non-elastic response of an example frame subjected to these original records and their extracted pulses to examine the efficiency of the extracted pulse of the records instead of the original accelerograms in dynamic analysis. The results of this study revealed that the efficiency of the extracted pulses to estimate the structure capacity depends on the structural performance levels. From the numerical analysis performed in the present study, it is found that if a given structure is designed for immediate occupancy (IO) performance level (low drift), the application of the extracted pulses overestimates the structure capacity, which is in the unsafe side. Nevertheless, if the structure is designed for collapse prevention (CP) performance level and experiences high level of non-elastic displacements, the extracted pulses provide a conservative estimation of the collapse capacity, which is in the safe side.

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Section: Deterioration States and Criterions Of The Structural Collapsementioning

confidence: 99%

Efficiency of near-fault ground motion pulses to evaluate seismic performance of the SMRF Systems

Mobinipour¹,

Pourzeynali²

2019

J. vibroeng.

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“…Figure 7 shows the steel moment frame without the proposed systems. It consists of (degrees) 10 20 Figure 8(a) portrays the damping device detail that comprises VEDs, tension rods, and a pin-supported seesaw member. Figure 8(b) shows the analysis model in which some rigid truss members form both the seesaw member and the pin-support.…”

Section: Design Of the Steel Moment Framementioning

confidence: 99%

Seismic response of steel structures with seesaw systems using viscoelastic dampers

Kang

Tagawa

2012

Earthq Engng Struct Dyn

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SUMMARY Vibration control systems are being used increasingly worldwide to provide enhanced seismic protection for new and retrofitted buildings. This paper presents a new vibration control system on the basis of a seesaw mechanism with viscoelastic dampers. The proposed vibration control system comprises three parts: brace, seesaw member, and viscoelastic dampers. In this system, only tensile force appears in bracing members. Consequently, the brace buckling problem is negligible, which enables the use of steel rods for bracing members. By introducing pre‐tension in rods, long steel rods are applicable as bracing between the seesaw members and the moment frame connections over some stories. Seesaw mechanisms can magnify the damper deformation according to the damper system configuration. In this paper, first, the magnification factor, that is, the ratio of the damper deformation to the story drift, is delivered, which includes the rod deformation. Results of a case study demonstrate that the magnification factor of the proposed system is greater than unity for some cases. Seismic response analysis is conducted for steel moment frames with the proposed vibration control system. Energy dissipation characteristics are examined using the time‐history response results of energy. The maximum story drift angle distributions and time‐history response results of displacement show that the proposed system can reduce the seismic response of the frames effectively. Copyright © 2012 John Wiley & Sons, Ltd.

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“…Rossetto and Elnashai (2003) question the reliability of this method as a result of varying expert opinion. Analytical curves (Dimova and Hirata, 2000) are derived from damage distributions of simulated damage data by either nonlinear quasi-static or inelastic time history dynamic methods or both. This involves a lot of computational effort and modelling deficiencies in an attempt to reduce variability of damage estimates.…”

Section: Fragility-based Assessment Of Non-ductile Rc Frame Buildingsmentioning

confidence: 99%

Generation of analytical fragility curves for Ghanaian non-ductile reinforced concrete frame buildings

Adom-Asamoah

2012

Int. J. Phys. Sci.

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This study is on seismic safety evaluation of non-ductile reinforced concrete (RC) frame buildings in Ghana. Generic 3-, 4-and 6-storey non-ductile RC buildings were characterised for assessment. The generic buildings were designed according to British Standard (BS) 8110. The fragility curve parameters were generated using inelastic time history analyses for seismic demand and inelastic pushover analyses for structural capacity of the buildings. As a result of lack of real time histories in Ghana, 3 suites of 100 synthetic time history records each were generated in order to generate lower and upper bounds for inelastic dynamic response. Parameters of collapse fragility curves with 50% probability of exceedance were established for the generic non-ductile Ghanaian frame buildings using short duration near-fault like records. All the curves represent the probability of exceeding the collapse limit state as a function of the peak ground acceleration (PGA) and spectral acceleration at the fundamental mode period of the generic buildings. Using the data from the nonlinear dynamic analysis of the generic buildings under all 300 synthetic time histories, a pair of three sets of fragility curves was developed. Results obtained showed that the generic non-ductile 3 to 6 storey RC frame buildings subjected to near-fault like ground motions may record high probabilities of collapse, if they are situated in 0.25 to 0.35 g PGA seismic zones.

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

Cited by 36 publications

References 17 publications

Efficiency of near-fault ground motion pulses to evaluate seismic performance of the SMRF Systems

Efficiency of near-fault ground motion pulses to evaluate seismic performance of the SMRF Systems

Seismic response of steel structures with seesaw systems using viscoelastic dampers

Generation of analytical fragility curves for Ghanaian non-ductile reinforced concrete frame buildings

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