The ductility-based strength reduction factor for the mainshock–aftershock sequence-type ground motions

Zhai, Changhai; Wang, Wen; Li, Shuang; Xie, Lili

doi:10.1007/s10518-015-9744-z

Cited by 48 publications

(17 citation statements)

References 45 publications

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“…Ruiz‐García, [ 2 ] Goda, [ 3 ] and Goda et al [ 4 ] studied the differences in characteristics between a mainshock and major aftershock records, providing useful insights into the MSAS records selection or generation. The response spectra of MSAS sequences were proposed for the performance evaluation [ 5–9 ] and seismic design [ 10–14 ] after considering the effects of aftershocks. The influence of MSAS sequences on the seismic response of buildings, mainly including steel frames [ 15–18 ] and reinforced concrete (RC) frames, [ 19–21 ] was also investigated with recorded or artificial MSAS sequences.…”

Section: Introductionmentioning

confidence: 99%

Vulnerability assessment of a high‐rise building subjected to mainshock–aftershock sequences

Wang

Zhai

2020

Structural Design Tall Build

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Summary Strong aftershocks have the potential to further aggravate the damage state of structures, and much less attention has been given to the seismic vulnerability of high‐rise buildings than that of low‐ to medium‐rise buildings. This study assesses the seismic vulnerability of a 32‐storey frame–core tube building by performing the incremental dynamic analysis on the material‐based three‐dimensional numerical model. A storey damage model based on the material damage is developed using the weighted average method. Eighteen recorded mainshock–aftershock sequences, whose mainshock records match the target spectrum, are selected. The results indicate that the developed stroey damage model can effectively reflect the additional damage induced by aftershocks. Strong aftershocks have high potential to change the location of weak storeys. Notably, shifts of weak storeys are observed in more than 30% of aftershocks with relative spectral acceleration of 0.8. As the mainshock‐induced damage state becomes more severe, the mainshock‐damaged building becomes increasingly fragile to the aftershock excitation and more sensitive to aftershock intensities. The probability of exceeding severe damage state increases from 35.3% to 62.1% due to the effects of strong aftershocks. The results in this study can provide supports to the seismic resilience assessment of this high‐rise building.

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Section: Introductionmentioning

confidence: 99%

Vulnerability assessment of a high‐rise building subjected to mainshock–aftershock sequences

Wang

Zhai

2020

Structural Design Tall Build

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“…[6] which explain that multi-story moment resisting frames experience extensively damage due to multiple earthquake in comparison with the single earthquake effect. Recent studies regarding repeated earthquake are conducted using single degree of freedom system by Zhai et al [7,8] in order to investigates the damage and the reduction factor. Hatzivassiliou and Hatzigeorgiou [9] evaluates the extensive damage of RC frames due to repeated earthquakes in more detail using three dimensional model.…”

Section: Introductionmentioning

confidence: 99%

Performance of Moment Resisting RC Frames under Repeated Earthquakes Containing Fling-Step Effect

2019

IJRTE

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The ground motion record from near-field earthquake may have forward and backward directivity effects. The first has pulse and fling-step signatures in its velocity and displacement motions, respectively. It is well recognized that the ground motion with pulse and fling-step effects amplified the building drift larger than the ground motion with no pulse and fling-step effects. The building damage also occurs due to earthquakes that are not singly exhibited. This includes the ground motion with fling-step, which is not many studied so far, especially in comparison with ground motion with pulse effect. Therefore, the goals of this study are to find out the effect of repeated earthquakes containing fling-step on the reinforced concrete (RC) moment resisting frames (MRF) in form of interstory drift ratio (IDR) and collapse probability. The 5-, 10-, and 15-story RC frames are taking into account as special, moderate and ordinary MRF, which is based on the R-factor of R = 8, R = 5, and R = 3. Based on the result of incremental dynamic analysis, the cumulative distribution function is statistically developed to define the fragility function. This function is treated as the probability of collapse of RC frames. The result shows that the performance of RC frames induced by single ground motion containing fling-step is at least 2 times larger than the single ground motion with pulse effect. The repeated earthquakes containing fling-step effect propagate the drift of 1.32 and 1.50 times larger than single earthquake with fling-effect. These motions cause the 10- and 15-story RC frames with R = 8 to have 100% of probability of collapse.

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Section: Introductionmentioning

confidence: 99%

“…During the last decade, many researchers have paid their attentions to the effects of seismic sequence or multiple events on the structural performance. Lots of works have been conducted to study the engineering problems related to the MSAS sequences, including ground motion characteristics of MSAS sequences, 1 response spectra of MSAS ground motions, [2][3][4][5][6][7][8][9][10] and effects of aftershocks on the damage of multiple degrees of freedoms (MDOF) structures. How to accurately and quickly estimate the cumulative damage induced by MSAS sequences is the key step in the process of incorporating the aftershocks into seismic design and resilience assessment.…”

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confidence: 99%

Damage spectra of global crustal seismic sequences considering scaling issues of aftershock ground motions

Wang

Zhai

2018

Earthq Engng Struct Dyn

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Summary Recent studies and earthquakes have shown that the mainshock‐aftershock (MSAS) sequences would induce significant cumulative damage, and it is urgent to incorporate the MSAS sequences into performance‐based seismic design and resilience assessment. For this purpose, one of the key problems is how to accurately and quickly estimate the cumulative damage induced by MSAS sequences. This manuscript investigates the damage spectra of global crustal MSAS sequences and proposes a prediction equation of damage spectra as a tool to quantify the cumulative damage caused by MSAS sequences. The recorded MSAS ground motions from global crustal seismic sequences are collected. The structures are modeled by 4 different kinds of single degree of freedom systems with/without degradation and pinching behavior. The scaling indicator and scaling factor SF of aftershock ground motions are studied from the point of view of efficiency and accuracy. The results indicate that scaling aftershock ground motions with spectra acceleration Sa present the best efficiency. Applying the condition of SF smaller than or equal to 5.0 (ie, SF ≤ 5.0) can clearly reduce the bias induced by over‐scaling and meanwhile has no change on the dispersion of results. Strong aftershocks (eg, relative Sa greater than 0.8) can increase the damage spectra by the minimum level of 20% for non‐degrading systems, and quantitative effects of aftershocks strongly depend on the period of vibration, strength reduction factor, hysteretic behavior, and intensity of the aftershock ground motions. The proposed prediction equation shows high accuracy on the estimation of the cumulative damage induced by MSAS sequences.

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The ductility-based strength reduction factor for the mainshock–aftershock sequence-type ground motions

Cited by 48 publications

References 45 publications

Vulnerability assessment of a high‐rise building subjected to mainshock–aftershock sequences

Vulnerability assessment of a high‐rise building subjected to mainshock–aftershock sequences

Performance of Moment Resisting RC Frames under Repeated Earthquakes Containing Fling-Step Effect

Damage spectra of global crustal seismic sequences considering scaling issues of aftershock ground motions

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