Abstract
By using the harmonic response analysis in the finite element analysis method, the seismic dynamic interaction of the three-dimensional urban building group-homogeneous sedimentary basin is studied. The viscoelastic artificial boundary is introduced, which can overcome both the defects of low-frequency drift and high-frequency instability, and the equivalent load in frequency domain is obtained by fast Fourier transform for loading, to explore the influence of the different incident frequencies (0.5–5.0 Hz), different numbers (196, 400, 676), and spacing (55 m, 62.5 m, 70 m) of building groups on the ground motion of homogeneous sedimentary basin under the incidence of SV wave. Numerical results illustrate that at low frequency, the displacement cloud image of the homogeneous sedimentary basin model shows an obvious phenomenon of “central focusing.” With the increase of frequency, the displacement cloud image gradually changes from “central focusing” to “multipoint focusing.” Meanwhile, the displacement peak gradually moves from the surface to the center of the basin. At a certain incident frequency, the existence of dense building groups will change the spatial distribution of displacement amplitude in the basin. Under the action of high-frequency incident waves, denser building groups with more buildings and smaller building spacing have a more pronounced weakening effect on the seismic response of homogeneous sedimentary basins. The displacement response of the center of the basin is generally large. When planning important buildings, the center area should be avoided as much as possible. For existing buildings, structural reinforcement is needed. It is of great significance for the planning and layout of buildings in the soft sedimentary basin and the reasonable spacing of buildings to reduce the risk of urban earthquake disaster.
Highlights
Site-City Interaction (SCI) under seismic wave incidence is an active research topic in many fields such as the geotechnical engineering, earthquake engineering, and geophysics
Tsogka and Wirgin [29] used the finite element method to study the “SCI” problem of soft soil-building groups under SH wave excitation, and the results showed that the seismic response of building groups showed great heterogeneity due to multiple coherent effects of seismic waves
It is worth noting that the above studies mainly focus on the single two-dimensional or three-dimensional site effect, as well as the dynamic interaction between the site and several buildings, and there is a lack of research on the dynamic interaction between the three-dimensional sitebuilding groups. is paper uses the viscoelastic boundary wave finite element simulation method, build up to 676 buildings 3D building groups-homogeneous sedimentary basin model, and harmonic response analysis is introduced into solving the frequency domain solution, and explores the effects of the number and spacing of urban dense building groups on the ground motion of homogeneous sedimentary basins, so as to provide the theory basis for seismic fortification, etc
Summary
Site-City Interaction (SCI) under seismic wave incidence is an active research topic in many fields such as the geotechnical engineering, earthquake engineering, and geophysics. Using the periodic green function, Volkov and Zheltukhin [32] proposed an efficient method to study the interaction between building groups and the overall resonance effect He et al [33] used the wave finite element method to establish a two-dimensional model of buildings and sedimentary valley. Is paper uses the viscoelastic boundary wave finite element simulation method, build up to 676 buildings 3D building groups-homogeneous sedimentary basin model, and harmonic response analysis is introduced into solving the frequency domain solution, and explores the effects of the number and spacing of urban dense building groups on the ground motion of homogeneous sedimentary basins, so as to provide the theory basis for seismic fortification, etc It is worth noting that the above studies mainly focus on the single two-dimensional or three-dimensional site effect, as well as the dynamic interaction between the site and several buildings, and there is a lack of research on the dynamic interaction between the three-dimensional sitebuilding groups. is paper uses the viscoelastic boundary wave finite element simulation method, build up to 676 buildings 3D building groups-homogeneous sedimentary basin model, and harmonic response analysis is introduced into solving the frequency domain solution, and explores the effects of the number and spacing of urban dense building groups on the ground motion of homogeneous sedimentary basins, so as to provide the theory basis for seismic fortification, etc
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