Spectral analysis of layered sites using shaking table tests

Fan, Gang; Zhang, Jianjing; Wu, Jinbiao; Yan, Kongming

doi:10.1371/journal.pone.0212766

Cited by 4 publications

(5 citation statements)

References 21 publications

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“…were applied to the model slopes with a gradually increasing amplitude [29][30][31][32][33][34][35][36][37][38][39]. The loading sequence in Table 4 allowed an insight into the evolution of the slope response from linear to nonlinear, assuming that the effect of minor deformation of model slope can be neglected under small-amplitude excitations.…”

Section: Plos Onementioning

confidence: 99%

“…Besides numerical simulation and field monitoring, shaking table tests are widely used in studying the seismic behaviors of rock slopes. The majority of test models simulated rock slopes with soil covering [26,27] or with discontinuous structures, such as jointed rock slopes [28][29][30], bedding rock slopes [31,32], counter-bedding rock slopes [10,33], and horizontally layered rock slopes [34,35]. These studies generally focused on the dynamic responses of acceleration/displacement and seismic failure, including the topographic/stratigraphic amplification of slope responses and the spatial development of discontinuities and their relations with the seismic forces controlling the failure modes of rock slopes.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic acceleration response of a rock slope with a horizontal weak interlayer in shaking table tests

Liu

Qiu

2021

PLoS ONE

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The weak interlayer in a rock slope often plays a significant role in seismic rockslides; however, the effect of weak interlayer on the seismic slope response and damage process is still not fully understood. This study presents a series of shaking test tests on two model slopes containing a horizontal weak interlayer with different thicknesses. A recorded Wenchuan earthquake ground motion was scaled to excite the slopes. Measurements from accelerometers embedded at different elevations of slope surface and slope interior were analyzed and compared. The effect of the weak interlayer thickness on the seismic response was highlighted by a comparative analysis of the two slopes in terms of topographic amplification, peak accelerations, and deformation characteristics as the input amplitude increased. It was found that the structure deterioration and nonlinear response of the slopes were manifested as a time lag of the horizontal accelerations in the upper slope relative to the lower slope and a reduction of resonant frequency and Fourier spectral ratio. Test results show that under horizontal acceleration, both slopes exhibited significant topographic amplification in the upper half, and the difference in amplification between slope face and slope interior was more pronounced in Slope B (with a thin weak interlayer) than in Slope A (with a thick weak interlayer). A four-phased dynamic response process of both slopes was observed. Similar deformation characteristics including development of strong response zone and macro-cracks, vertical settlement, horizontal extrusion and collapse in the upper half were observed in both slopes as the input amplitude increased; however, the deformations were more severe in Slope B than in Slope A, suggesting an energy isolation effect of the thick interlayer in Slope A.

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Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic acceleration response of a rock slope with a horizontal weak interlayer in shaking table tests

Liu

Qiu

2021

PLoS ONE

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“…Given the limitation for article length, both the two earthquake acceleration time-history curves and the spectrum analysis results are elucidated in the Supplemental Materials. By comparing with some previous references (Fan et al, 2019;Vaseghi Amiri et al, 2008), the accuracy of our frequency spectrum analysis results can be validated. The critical spectrum regions are mainly located in lowfrequency range smaller than 5 Hz.…”

Section: Seismic Mitigation Case Studiesmentioning

confidence: 70%

Nonlinear dynamic analysis of the bridge bearing and genetic algorithm–based optimization for seismic mitigation

Liang

Cheng

Liu

et al. 2020

Advances in Structural Engineering

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Seismic mitigation for bridges by the specific bearing with highly elastoplastic dissipaters is very important to ensure safety of superstructures exposed to earthquakes. To study the lateral vibration of the bridge bearing, a nonlinear dynamic model is developed while thoroughly considering highly nonlinear mechanical properties of the bearing in this article. The generalized- α method is specifically adapted to solve the nonlinear equations. Moreover, nonlinear behavior of the bearing is fully incorporated through direct path-following of the practical experimental hysteresis curve. The proposed method is validated through careful comparison between the dynamic simulation and the quasi-static experimental results. Mechanical responses of the bridge-pier system under earthquake excitations can be calculated in a more reliable manner. On this basis, a parametric optimization model involving several key parameters of the bearing-pier system is developed. The optimization problem is solved by the genetic algorithm as the searching tool. Numerical examples show that mechanical responses of the bridge-pier system subjected to the earthquake excitations can be effectively mitigated after parametric optimization. The extensive applicability of the proposed method is validated through finding the optimized parameters for the bearing when multiple different earthquakes are considered. Moreover, the accumulative energy absorption of the bearing is also considered to enhance the seismic performance of the bearing. This work provides a reliable way of dynamic performance prediction and seismic mitigation study of nonlinear bridge bearing under earthquake excitations given any complex experimental hysteresis curve.

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“…Fan et al. studied the difference in the dynamic response between bedded and anti‐dip rock slopes with muddy interlayers in detail 12,13 . Guo et al.…”

Section: Introductionmentioning

confidence: 99%

“…11 Fan et al studied the difference in the dynamic response between bedded and anti-dip rock slopes with muddy interlayers in detail. 12,13 Guo et al studied the dynamic response and failure mechanism of thin/thick interlayered rock slopes and the dynamic response of bedded rock slopes with weak interlayers. 14 Zhang Dan et al studied the ground motion response of fractured soil slopes by shaking table testing.…”

Section: Introductionmentioning

confidence: 99%

Study on the strain response of slopes containing cavities under the effect of strong earthquakes

Wang,

Huang,

Wang

et al. 2024

Earthq Engng Struct Dyn

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The weak points in a slope often control its deformation and failure mode. Under the action of earthquakes, the complex influence of seismic waves on slopes with cavities is rarely considered. By studying the strain response of this kind of slope, the triggering mechanism of the slope under a strong earthquake can be further discussed. On the basis of the existing research, a shaking table test of a slope model with a cavity structure is carried out. The following conclusions were made: (1) Under the condition of a strong earthquake, the initial crack of the slope with cavities mainly occurs around the cavities, the top of the slope, and the boundary of the slope. (2) During the vibration process, the peak air pressure in a cavity has a good correlation with the peak strain in the surrounding material. The peak strain appears just after the peak air pressure, indicating that the sudden change in the air pressure in the cavity will lead to significant tensile damage to the cavity wall. Repeated air pressure changes in the cavity cause progressive damage to the slope near the cavity structure, accelerating fracture expansion and leading to the fracture penetrating the slope boundary. (3) The overall failure of the slope is somewhat related to the development of cracks around the cavity structure, but failure does not necessarily occur along the cavity zone. The failure site is closely related to the free surface condition and the upper slope structure.

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Spectral analysis of layered sites using shaking table tests

Cited by 4 publications

References 21 publications

Dynamic acceleration response of a rock slope with a horizontal weak interlayer in shaking table tests

Dynamic acceleration response of a rock slope with a horizontal weak interlayer in shaking table tests

Nonlinear dynamic analysis of the bridge bearing and genetic algorithm–based optimization for seismic mitigation

Study on the strain response of slopes containing cavities under the effect of strong earthquakes

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