A damage‐based definition of effective peak acceleration

Basu, Biswajit; Gupta, Vinay K.

doi:10.1002/(sici)1096-9845(199805)27:5<503::aid-eqe739>3.0.co;2-#

Cited by 6 publications

(1 citation statement)

References 12 publications

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“…An et al [5] proposed an improved EPA adjustment method is proposed, which can be applied to all types of seismic waves by using a unified expression, and it is verified that the improved method can evaluate the ground vibration intensity more reasonably. In addition, Biswajit Basu et al [6] studied the dependence of EPA on several control parameters, and the results showed that although EPA was highly dependent on the time period, it was Sustainability 2022, 14, 16985 2 of 17 possible to obtain the "periodic average" EPA value of some ground motion processes in the project, which provided a reasonable basis for obtaining the EPA of a given ground motion. Cao et al [7] performed a statistical analysis of the EPA definition and related parameters in the code based on the response spectra of acceleration records from 222 sets of actual earthquakes, and the results show that the dispersion degree of EPA calculated by EPA = Sa(T )/βmax(T ) is larger than that calculated by the EPA = Sa(0.1-0.5)/β(0.1-0.5).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of EPA of Ground Motion to Soil Slope Dynamic Response

Zhang

Shen²,

Lü

et al. 2022

Sustainability

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To study the influence law of effective peak acceleration (EPA) on the seismic response of soil slope, the finite element method was used to simulate the slope response under earthquake action with 100 actual seismic records were selected, the influence law of the EPA under four different definitions commonly used in domestic and foreign codes on the soil slope seismic response was discussed, and which was compared with the influence law of the peak acceleration (PGA). The results showed that the deformation and the maximum principal stress of soil slope both increased with the EPA and PGA, which had an obvious linear relationship, but the correlation degree were different with the parameters of PGA and EPA by the different definitions. EPA1 by the first definition has the highest correlation with the soil slope seismic response, followed by PGA, which was close to EPA1. Other parameters in order of correlation coefficient were EPA2, EPA3 and EPA4. In this example, EPA1 and PGA could better describe the response degree of soil slope in earthquake. The results are expected to provide a basis for the selection of seismic parameters in soil slope seismic stability evaluation.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of EPA of Ground Motion to Soil Slope Dynamic Response

Zhang

Shen²,

Lü

et al. 2022

Sustainability

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The effective number of cycles of earthquake ground motion

Hancock

Bommer

2005

Earthquake Engng Struct. Dyn.

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SUMMARYThe seismic response of any system that accumulates damage under cyclic loading is dependent not only on the maximum amplitude of the motion but also its duration. This is explicitly recognized in methods for estimating the liquefaction potential of soil deposits. Many researchers have proposed that the e ective number of cycles of the ground motion is a more robust indicator of the destructive capacity of the shaking than the duration. However, as is the case with strong-motion duration, there is no universally accepted approach to determining the e ective number of cycles of motion, and the di erent methods that have been proposed can give widely varying results for a particular accelerogram. Deÿnitions of the e ective number of cycles of motion are reviewed, classiÿed and compared. Measurements are found to di er particularly for accelerograms with broad-banded frequency content, which contain a signiÿcant number of non-zero crossing peaks. The key seismological parameters in uencing the number of cycles of motion and associated equations for predicting this quantity for future earthquakes are identiÿed. Correlations between cycle counts and di erent duration measures are explored and found to be rather poor in the absence of additional parameters.

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A preliminary prediction of seismic damage‐based degradation in RC structures

Gupta

Nielsen

Kirkegaard

2001

Earthq Engng Struct Dyn

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SUMMARYEstimation of structural damage from a known increase in the fundamental period of a structure after an earthquake or prediction of degradation of sti ness and strength for a known damage requires reliable correlations between these response functionals. This study proposes a modiÿed Clough-Johnston singledegree-of-freedom oscillator to establish these correlations in the case of a simple elasto-plastic oscillator. It is assumed that the proposed oscillator closely models the response of a given multi-degree-of-freedom system in its fundamental mode throughout the duration of the excitation. The proposed model considers the yield displacement level and ductility supply ratio-related parameter as two input parameters which must be estimated over a narrow range of ductility supply ratio from a frequency degradation curve. This curve is to be identiÿed from a set of recorded excitation and response time-histories. Useful correlations of strength and sti ness degradation with damage have been obtained wherein a simple damage index based on maximum and yield displacements and ductility supply ratio has been considered. As an application, the proposed model has been used to demonstrate that ignoring the e ects of aftershocks in the case of impulsive ground motions may lead to unsafe designs.

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A damage‐based definition of effective peak acceleration

Cited by 6 publications

References 12 publications

Sensitivity of EPA of Ground Motion to Soil Slope Dynamic Response

Sensitivity of EPA of Ground Motion to Soil Slope Dynamic Response

The effective number of cycles of earthquake ground motion

A preliminary prediction of seismic damage‐based degradation in RC structures

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