Seismic fragility of lateral force resisting systems under near and far-fault ground motions

Soltangharaei, Vafa; Razi, Morteza; Vahdani, Reza

doi:10.1504/ijstructe.2016.077722

Cited by 5 publications

(4 citation statements)

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“…Based on the analysis method in Section 2.3, a total of 24,000 time history analyses are performed for the following permutations: three storey number of 4, 8, and 12; four strength eccentricity ratios of 0.00, 0.10, 0.20, and 0.30; two earthquake types including 10 pulse‐like ground motions and 10 corresponding non‐pulse‐like ones; and five PGA levels of 0.1–0.9 g with an increment of 0.2 g and 200 samples for each PGA level. The analysis shows that there is no consistent change trend (monotonous increase or decrease) in the seismic fragility with the change of storey number, which can be also observed in other similar studies 4,28 . Additionally, the change trends of the seismic fragility of individual models observed are similar to those averaging from 4‐, 8‐, and 12‐storey frames.…”

Section: Resultssupporting

confidence: 72%

“…The analysis shows that there is no consistent change trend (monotonous increase or decrease) in the seismic fragility with the change of storey number, which can be also observed in other similar studies. 4,28 Additionally, the change trends of the seismic fragility of individual models observed are similar to those averaging from 4-, 8-, and 12-storey frames. Also, as the numerical analyze of the 24,000 cases are extremely time-consuming, the mean values of the numerical results for 4-, 8-, and 12-storey frames are used in the following analysis as Cai et al 11 did in their study.…”

Section: Resultssupporting

confidence: 56%

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Seismic fragility analysis of strength eccentric structures subjected to pulse‐like ground motions

Liu

Jia

et al. 2019

Structural Concrete

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The seismic fragility of reinforced concrete (RC) frame systems considering the disadvantages of both structural eccentricities and pulse-like earthquake effects is investigated. A total of 24,000 nonlinear time history analyses are performed using CANNY program. The influence of pulse-like ground motion and strength eccentricity on the seismic fragility is studied quantitatively, in terms of interstorey drift, ductility, and floor rotation. The results show that the probability of reaching and exceeding a predefined damage state (P f) is apparently higher for pulse-like case than for non-pulse-like case. At a moderate eccentricity level of 0.2 and a moderate damage state (selected moderate case) with a peak ground acceleration (PGA) of 0.4 g, the P f values of interstorey drift and ductility for pulse-like case are 14 and 10% larger, respectively, than those for non-pulse-like case. The strength eccentricity also has a great effect on the structural seismic fragility. The PGA at a given probability level decreases with increasing eccentricity. For the selected moderate case, the PGAs at an exceeding probability of 50% are 0.40, 0.56, and 1.15 g for the P f values of interstorey drift, ductility, and floor rotation, respectively. The obtained fragility curves could help to quantitatively evaluate the seismic behavior of eccentric RC frame structures subjected to pulse-like ground motions.

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Section: Resultssupporting

confidence: 72%

Section: Resultssupporting

confidence: 56%

Seismic fragility analysis of strength eccentric structures subjected to pulse‐like ground motions

Liu

Jia

et al. 2019

Structural Concrete

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“…The varying parameters included building age, number of stories, presence and position of infill panels, plan dimensions, external beams stiffness, and concrete strength. Soltangharaei et al employed the incremental dynamic analysis to derive the fragility curves of buckling restrained braced frames under near-and far-fault ground motions [15]. It was concluded that the seismic performance of the buckling restrained braced frames against near-fault records was similar to special moment frames or even better in some cases.…”

Section: Introductionmentioning

confidence: 99%

Comparison of seismic fragility of special moment frames in recent editions of ASCE 7 and ACI 318 regulations

Behnamfar

Nezhad

2022

NMCE

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The seismic safety levels provided by the three most recent editions of ACI and ASCE regulations for new moment frame structures are determined. Five special RC moment frames having 3, 5, 10, 15, and 20 stories are designed separately based on and the associated seismic regulations of UBC 97,. A suit of 10 consistent earthquake records is selected for non-linear dynamic analysis of buildings. Incremental dynamic analysis is conducted, and the corresponding fragility curves are calculated. The comparison of results shows that seismic safety of special moment frame buildings has considerably improved from ACI 318-99 to ACI 318-11, and from UBC 97 to ASCE 7-10, owing its larger part to the improvements made in the two latter versions of the mentioned building codes. However, the safety enhancement is not uniform and is much less for buildings with larger fundamental periods, especially for periods larger than 1.0 sec. For structures with fundamental periods smaller than 1 sec, the collapse ratio has increased up to more than 70%. For larger fundamental periods, the increase is less than 20%. Changes in ASCE7 with regard to the R-factor and coefficients of the load combination equations and its introduction of stricter requirements for the allowable story drift are pinpointed to be the most important factors. For the ACI codes, stricter requirements regarding the confinement of the plastic hinges and configuration of the longitudinal reinforcement are recognized to be the most influential changes. D

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“…In nonlinear time history analysis, several earthquakes excitations records are utilized as the base-excitation forces, and then the seismic responses of the structure are calculated using a numerical method for solving the differential motion equations. Despite the accuracy of nonlinear time history analysis, it is timeconsuming and sensitive to numerical and modeling parameters [17][18][19]. Pushover analysis is the other analysis technique that potentially would overcome the attributed problems for nonlinear time history analysis.…”

Section: Introductionmentioning

confidence: 99%

Growth Inhibition of Various Pathogenic Microorganisms Using Effective Microorganisms (EM)

Taghinezhad

Mahdavifar

et al. 2018

IJRE

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Abstract:The accurate prediction of story drift and its distribution along the height of the structure is very critical for seismic performance evaluation since the non-structural damage is directly related to the story drift. Pushover analysis is an accepted method for seismic evaluation of existing structures as well as performance-based design of new structures. Regarding assumptions and limitations in pushover analysis, there is a need to estimate the error that would affect the accuracy of story drift. This paper investigates the validity of pushover analysis to predict story drift under different lateral load patterns. For this purpose, several reinforced concrete moment frames with different heights were analyzed using pushover and nonlinear time history analyses and obtained results were compared to evaluate the error level.

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Seismic fragility of lateral force resisting systems under near and far-fault ground motions

Cited by 5 publications

References 0 publications

Seismic fragility analysis of strength eccentric structures subjected to pulse‐like ground motions

Seismic fragility analysis of strength eccentric structures subjected to pulse‐like ground motions

Comparison of seismic fragility of special moment frames in recent editions of ASCE 7 and ACI 318 regulations

Growth Inhibition of Various Pathogenic Microorganisms Using Effective Microorganisms (EM)

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