Quantification of Fundamental Frequencies of 3D Basins and Structures and Site–City Interaction Effects on Responses of Structures

Kumar, Neeraj; Narayan, J.

doi:10.1007/s00024-019-02158-8

Cited by 10 publications

(5 citation statements)

References 35 publications

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“…interaction (SSCI), the structural seismic response [11][12][13][14][15][16][17][18][19][20] and ground motion [21][22][23][24][25][26] within the different regions are disturbed to varying degrees. It means that the two problems concurrently faced in this task include the increased computational effort caused by the surge of structures number as well as the polluted ground motion due to the SSCI effect.…”

Section: Noveltymentioning

confidence: 99%

“…However, the accompanying challenges are the guarantees for the accuracy and timeliness of the simulated results. Due to the site‐structure cluster interaction (SSCI), the structural seismic response 11–20 and ground motion 21–26 within the different regions are disturbed to varying degrees. It means that the two problems concurrently faced in this task include the increased computational effort caused by the surge of structures number as well as the polluted ground motion due to the SSCI effect.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of spatially varying ground motion of urban buildings based on wavelet packet neural network

Guo

Wang

et al. 2023

Earthq Engng Struct Dyn

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Site‐structure cluster interaction (SSCI) has a significant effect on the seismic response of densely distributed buildings, and rationally and effectively quantifying its effect when modelling the urban seismic damage can provide more optimal decisions to mitigate earthquake disasters. This paper focuses on the input motion of the structures, by extracting the main influential parameters of SSCI and adopting the loosely typed wavelet packet neural network to rapidly simulate the spatially varying ground motion in the urban environment. In the proposed framework, the wavelet packet energy ratio is presented to describe the variation of ground motion characteristics and used as the sole output to carry out the multi‐resolution spectral modulation, and the training samples were accumulated by a validated finite element simulation method. The developed surrogate model considers the effects of a series of factors, including the earthquake intensity, site condition, configuration of structure cluster, structural dynamic characteristics and spacing, and is superior to the one using conventional artificial neural network. It is verified by a virtual test that the waveshape and spectral features of the predicted ground motion agree well with the target result with an error of peak acceleration being only 1.23%. The suggested approach has the advantages of better modulation precision and lower sample size requirement. Moreover, it is almost zero cost to use the developed surrogate model to correct the ground motion of urban buildings and to consider the influence of SSCI, and the structural seismic response can be more factually displayed in the time and space domains. These specialties make it a promising technique in the rapid assessment of urban seismic damage.

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Section: Noveltymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of spatially varying ground motion of urban buildings based on wavelet packet neural network

Guo

Wang

et al. 2023

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…Analytical methods are one of the most used technics methods to evaluate the seismic effects in structures. These methods intent to use a limited number of DOF, where the mechanical properties of the system are concentrated in a small number of lumped masses, dashpots, and springs (Mulliken and Karabalis, 1998;Yahyai et al, 2008;Kumar and Narayan, 2019;Cacciola and Tombari, 2020;Vicencio et al, 2024). Lu et al (2018), Lu et al (2019), Lu et al (2020) proposed a simple linear model that allows the SSSI between structures, where the dynamic stiffness matrix is formulated based on compliance matrices.…”

Section: Introductionmentioning

confidence: 99%

Seismic evaluation of Site-City interaction effects between city blocks

Vicencio,

Alexander

2024

Front. Built Environ.

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In urban environments, buildings are often seismically designed with their standalone response, such as isolated structures devoid of surrounding structures. Nonetheless, there is always a chance that a significant seismic interaction between nearby buildings through the underlying soil will occur in big urban areas with high building densities. This paper evaluates the Site-City interaction (SCI) between different city block arrangements under seismic excitation given different parameters of the buildings and centre-to-centre interbuilding distances. A database of strong ground motion records with Far-Field, Near-Field Without Pulse and Near-Field Pulse-Like characteristics are employed. The results suggest that the SCI effects were strongly influenced by the building properties and resonance effects of the soil stratum. Furthermore, as a mean for all the earthquakes considered here, the SCI can amplify or reduce the seismic response of the buildings, depending on the relative position between the city blocks.

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“…It was found that the SSCI could reduce the seismic response of most buildings, while certain buildings suffered more severe earthquake damage, and this might be due to the seismic frequency spectrum, site conditions and structural dynamic characteristics. Additionally, parametric analyses [25][26][27][28][29][30] were conducted on the influence of SSCI in specific situations through numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical study on ground motion characteristics under structure cluster disturbance

Guo

Wang

et al. 2022

Earthq Engng Struct Dyn

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Soil-structure cluster dynamic interaction (SSCI) has a significant effect on structural responses as well as ground motions for soft soil, while investigations on the latter remain limited. In this paper, four test models, including the free field model, soil-single structure model, soil-equal height structure cluster model, and soil-multiple height structure cluster model, were manufactured and investigated through large scale shaking table tests. The effect of structure numbers, layouts, structural dynamic characteristics and seismic spectrum characteristics on the ground motions was discussed. On this basis, finite element analysis and wavelet packet decomposition were employed to further investigate the evolution rule of cluster effect. The results manifested that, due to the structure cluster, the predominant period of the original free field could be elongated notably and earthquake response spectrum in the long period domain was amplified, especially under the excitation of seismic waves with abundant low-frequency components. The influence of SSCI on ground motions is chiefly reflected in the variation of site predominant period and the soil damping during the vibration. In addition, the cluster effect on ground motion presents a monotonous degressive trend with the increase of the structural spacing, and its attenuation rate is negatively correlated with structural height, while the difference in ground motion due to different structure numbers becomes insignificant with the increase of structural spacing.

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Quantification of Fundamental Frequencies of 3D Basins and Structures and Site–City Interaction Effects on Responses of Structures

Cited by 10 publications

References 35 publications

Simulation of spatially varying ground motion of urban buildings based on wavelet packet neural network

Simulation of spatially varying ground motion of urban buildings based on wavelet packet neural network

Seismic evaluation of Site-City interaction effects between city blocks

Experimental and analytical study on ground motion characteristics under structure cluster disturbance

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