Quantifying the optimal time gap between consecutive events

Abdollahzadeh, Gholamreza; Pourkalhor, Sahar; Vakhideh, Alaleh; Pourbahram, Zahra; Amirchoupani, Pouya

doi:10.1007/s42107-023-00575-8

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…The zero-length element and mass-proportional Raleigh damping were adopted for SDOF modeling of massspring and damping, respectively. It is worth mentioning that the uniaxial Material ElasticPP and Steel01 from the OpenSEES library was assigned to zero-length element to model the hysteresis behavior of the steel structures as an accepted method by many researchers and specifications [17,34,36,38,41]. Additionally, 30 periods of vibration from 0.1 s to 3 s with 0.1 s time intervals were considered for dynamic analysis.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, stiffness deterioration and strength degradation in structural systems are effective on displacement demand of the system under probable future events. The different stiffness deterioration and strength degradation protocols have not been considered before on Gamma factor (γ), where many researchers have confirmed its significant effect on seismic responses, such as Amirchoupani et al [34,35], Abdollahzadeh et al [36], ASCE/SEI 41-17 [1], and FEMA series [37,38].…”

Section: Introductionmentioning

confidence: 99%

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The Modified Energy-based Method for Seismic Evaluation of Structural Systems with Different Hardening Ratios and Deterioration Hysteresis Models

Nodeh Farahani,

Abdollahzadeh,

Mirza Goltabar Roshan

2023

Period. Polytech. Civil Eng.

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Prediction of target displacement in structural systems plays a significant role in performance-based design and rehabilitation of structures. In this study, the γ factor for different hardening ratios, including 1, 2, 3, 5, 7.5, 10, and 15 percentages, stiffness-strength-deterioration models, and soil type classes is determined to modify the energy balance equation in performance-based plastic design (PBPD). Statistical results indicate that the effect of the hardening ratio, deterioration, and soil type class on the capacity curve is considerable. Therefore, a simple equation based on the period of the vibration and ductility is suggested to estimate the γ factor in different structural systems. Moreover, four 1-, 3-, 7-, and 12-story moment steel structures with various hardening ratios in the material are designed to validate the proposed method. The suggested values for the γ factor show exact results compared to collected displacements from time history analysis, while the error in the previous work was considerable. Statistical results showed that the mean error in the previous method in estimating target displacement for 1-, 3-. 7-, and 12-story structures is about 15%, 20%, 20%, and 32%, respectively. Conversely, the mean error in this study for estimating target displacement of 1-, 3-. 7-, and 12-story structures is about 10%, 7%, 6%, and 15%, respectively. Finally, the proposed method is examined on the empirical reinforced concrete (RC) bridge pier simulated numerically with fiber-based modeling. Similarly, the suggested equation estimates the target displacement appropriately for the concrete model compared to achieved displacements from nonlinear dynamic analysis.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Modified Energy-based Method for Seismic Evaluation of Structural Systems with Different Hardening Ratios and Deterioration Hysteresis Models

Nodeh Farahani,

Abdollahzadeh,

Mirza Goltabar Roshan

2023

Period. Polytech. Civil Eng.

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“…The value of the required time gap primarily depends on damping ratio, ductility capacity, fundamental period of vibration, lateral yield strength of the building, and hysteric modeling parameters of materials. 79,80 Different values of time gap considered by researchers in the past are mentioned in Table 5. Recently, Pirooz et al 79 carried out a detailed investigation to estimate the required time gap to ensure the at-rest condition of the structure after mainshock.…”

Section: Time Gap Between Mainshock and Aftershock Ground Motionsmentioning

confidence: 99%

“…Usually, an adequate time gap is considered so that free vibrations of the structure cease after the occurrence of the mainshock. The value of the required time gap primarily depends on damping ratio, ductility capacity, fundamental period of vibration, lateral yield strength of the building, and hysteric modeling parameters of materials 79,80 …”

Section: Selection and Scaling Of Ground Motion Recordsmentioning

confidence: 99%

Seismic performance evaluation of reinforced concrete hilly buildings under sequence of earthquakes

Aggarwal,

Kulariya,

Saha

2023

Structural Design Tall Build

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SummaryThe present study investigates the effect of earthquake sequences on the response of reinforced concrete hilly buildings having typical configurations, that is, stepback and split‐foundation, with three different story ratios. A set of 30 as‐recorded mainshock‐aftershock sequence of earthquake ground motions is considered for this study. Mainshock acceleration time histories are scaled at two distinct intensity levels to obtain the mainshock‐damaged building. These mainshock‐damaged hilly buildings are then subjected to aftershocks. A comparative study is performed for various response quantities, such as peak interstory drift ratio, peak floor acceleration, and peak roof displacement of undamaged and mainshock‐damaged buildings under aftershocks. Further, fragility analysis is carried out to study the effect of aftershocks on undamaged and mainshock‐damaged hilly buildings. Subsequently, component‐wise seismic loss estimation due to damage in the non‐structural and structural components is performed. It is concluded from the study that the building components that contribute maximum to the expected repair cost ratio vary with respect to the intensity of the aftershocks. Also, the estimated seismic loss is higher in mainshock‐damaged split‐foundation buildings in comparison to stepback buildings.

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The evaluation of target displacement in structural systems using damage-based N2 (DN2) method under far-field ground motions for performance-based design theory

Nodeh Farahani,

Abdollahzadeh,

Mirza Goltabar Roshan

2024

Bull Earthquake Eng

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Quantifying the optimal time gap between consecutive events

Cited by 5 publications

References 32 publications

The Modified Energy-based Method for Seismic Evaluation of Structural Systems with Different Hardening Ratios and Deterioration Hysteresis Models

The Modified Energy-based Method for Seismic Evaluation of Structural Systems with Different Hardening Ratios and Deterioration Hysteresis Models

Seismic performance evaluation of reinforced concrete hilly buildings under sequence of earthquakes

The evaluation of target displacement in structural systems using damage-based N2 (DN2) method under far-field ground motions for performance-based design theory

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