3D time‐domain nonlinear analysis of soil‐structure systems subjected to obliquely incident SV waves in layered soil media

Zhang, Wenyang; Taciroğlu, Ertuǧrul

doi:10.1002/eqe.3443

Cited by 16 publications

(11 citation statements)

References 30 publications

(65 reference statements)

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“…Initially developed by Bielak et al [26] and verified in the companion paper by Yoshimura et al [27] in 2003, the DRM is implemented in the Real-ESSI Simulator. Although the DRM is still not widely used in practice, lately it has gained ground within the research community [28][29][30][31][32]. As implied by its name, the objective of DRM is to reduce a large computational domain (that includes the seismic source, wave propagation through rock and soil layers, and the structure of interest) to a much smaller domain (that includes only local soil and the structure of interest), allowing realistic modelling of a seismic event with the same accuracy, but with orders of magnitude less computational cost.…”

Section: The Domain Reduction Methods (Drm)mentioning

confidence: 99%

Seismic Resonant Metamaterials for the protection of an elastic-plastic SDOF system against vertically propagating seismic shear waves (SH) in nonlinear soil

Kanellopoulos¹,

Psycharis²,

Han³

et al. 2022

Preprint

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The paper explores the key mechanisms that govern the dynamic interaction between resonant metamaterials (consisting of multiple unit cells embedded in the soil, with horizontally vibrating internal masses) and an existing nonlinear structure on nonlinear soil. Elastic behavior of the soil and of the SDOF system, representing the structure, is also investigated for comparison. The Real-ESSI Simulator is employed to develop in-plane (2D) finite element (FE) models, and an extensive parametric analysis is conducted to evaluate the influence of key parameters on the protective efficiency of resonant metamaterials. Both artificial and real ground motions are used as seismic excitation, vertically propagated through the soil as shear waves (SH), employing the Domain Reduction Method (DRM). Two protective mechanisms are identified. The first mechanism is related to the inertial interaction of the metamaterials with the surrounding soil, namely, it is the out-of-phase resonant oscillation of the internal metamaterial masses with respect to the soil at periods close to the natural period of the structure. The maximum reduction in structural response is achieved when the resonant period of the metamaterials is equal or a bit larger than the effective period of the structure. The second mechanism is related to the kinematic interaction of the metamaterials with the surrounding soil, namely, the presence of empty unit cells (no internal masses) in the soil next to the structure creates a protective "shadow" zone. This kinematic interaction mechanism becomes effective when the wavelength of the incoming seismic waves is comparable to the size of the metamaterials, and at the same time, the period of the waves is close to the natural period of the structure. When both soil and structural nonlinearities are considered, the effect of metamaterials remains always beneficial, and their action is localized, making them practically harmless to neighboring structures.

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Section: The Domain Reduction Methods (Drm)mentioning

confidence: 99%

Seismic Resonant Metamaterials for the protection of an elastic-plastic SDOF system against vertically propagating seismic shear waves (SH) in nonlinear soil

Kanellopoulos¹,

Psycharis²,

Han³

et al. 2022

Preprint

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“…The input excitations are applied to the lower boundary of the model as a shear wave of SV according to the common assumption in numerical simulations. 83,84 Figure 8 shows the design spectrum along with the 5% damped average elastic spectrum of accelerations for different records. It should be noted that as a simplification, the one-dimensional ground motion that has no varying spatial components is assumed for the bedrock excitation in this study.…”

Section: Seismic Motionsmentioning

confidence: 99%

“…The mentioned code suggests a minimum seismic time duration (D 5 ‐D 95 ) of 10 s. The dominant periods of records range from 0.16 to 0.44 s. Other specifications of records are provided in Table 4. The input excitations are applied to the lower boundary of the model as a shear wave of SV according to the common assumption in numerical simulations 83,84 . Figure 8 shows the design spectrum along with the 5% damped average elastic spectrum of accelerations for different records.…”

Section: Numerical Modeling Proceduresmentioning

confidence: 99%

Slope topographic effects on the nonlinear seismic behavior of groups of similar buildings

Shamsi

Shabani

Zakerinejad³

et al. 2022

Earthq Engng Struct Dyn

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The occurrence of vibrational energy exchange between neighboring buildings via soil is a well-known issue today as structure-soil-structure interaction (SSSI) problems. Furthermore, the seismic performance of buildings near the slopes considering seismic topography-soil-structure interaction (TSSI) is entirely different from their performance on the flat grounds considering seismic soilstructure interaction (SSI). Therefore, this study evaluates the seismic response of three moments resistant frame steel buildings with 15, 10, and 5 stories using three dimensional numerical analysis as a new topography-structure-soilstructure interaction (TSSSI) problem. This issue has not been investigated in previous studies to the best of the authors' knowledge. In each case of TSSSI, two, three, and four buildings with similar dynamic properties were simulated simultaneously. The effects of foundation's rocking, numbers of buildings, and the 2D and 3D arrangements of buildings were investigated, and the results of TSSSI cases were compared with the corresponding SSSI cases. The inelastic behavior for both building components and soil was considered in the simulations. Analyzes are performed based on seven earthquake records from which the average value was taken as final results. Results show that it is essential to consider the TSSSI effect, and it can completely change the seismic performance of buildings near the slopes. Although the effects of TSSI and SSSI on the seismic responses of the low-rise similar structures are negligible relative to the SSI cases, the results show that the nonlinear TSSSI effects of adjacent buildings should be fully considered even for 5-story low-rise structures.

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“…It is deduced based on the finite element method for external-source problems, in which the ground near structures can be considered as elastic or elastoplastic, homogeneous, or heterogeneous. Regarding analysis under inclined motions, Zhang et al [18] used this method to analyze the responses of a rectangular underground structure under obliquely incident SV waves in homogeneous ground. They further developed their method for a layered ground [19].…”

Section: Introductionmentioning

confidence: 99%

A numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness matrix and domain reduction methods

Yang

Yuan

et al. 2023

Front. Struct. Civ. Eng.

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A numerical framework was proposed for the seismic analysis of underground structures in layered ground under inclined P-SV waves. The free-field responses are first obtained using the stiffness matrix method based on plane-wave assumptions. Then, the domain reduction method was employed to reproduce the wavefield in the numerical model of the soil—structure system. The proposed numerical framework was verified by providing comparisons with analytical solutions for cases involving free-field responses of homogeneous ground, layered ground, and pressure-dependent heterogeneous ground, as well as for an example of a soil—structure interaction simulation. Compared with the viscous and viscous-spring boundary methods adopted in previous studies, the proposed framework exhibits the advantage of incorporating oblique incident waves in a nonlinear heterogeneous ground. Numerical results show that SV-waves are more destructive to underground structures than P-waves, and the responses of underground structures are significantly affected by the incident angles.

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3D time‐domain nonlinear analysis of soil‐structure systems subjected to obliquely incident SV waves in layered soil media

Cited by 16 publications

References 30 publications

Seismic Resonant Metamaterials for the protection of an elastic-plastic SDOF system against vertically propagating seismic shear waves (SH) in nonlinear soil

Seismic Resonant Metamaterials for the protection of an elastic-plastic SDOF system against vertically propagating seismic shear waves (SH) in nonlinear soil

Slope topographic effects on the nonlinear seismic behavior of groups of similar buildings

A numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness matrix and domain reduction methods

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