Time-domain two-dimensional site response analysis of non-homogeneous topographic structures by a hybrid BE/FE method

Kamalian, Mohsen; Jafari, Mohammad Kazem; Sohrabi-Bidar, Abdollah; Razmkhah, Arash; Gatmiri, Behrouz

doi:10.1016/j.soildyn.2005.12.008

Cited by 88 publications

(45 citation statements)

References 17 publications

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“…G N +1−n ij and F N +1−n ij are the convoluted elastodynamic displacement and traction kernels, respectively, derived upon their corresponding fundamental solutions F ij and G ij , presented in Reference [31].…”

Section: Numerical Formulationmentioning

confidence: 99%

“…Equations (9) and (10) were implemented in a general purpose 2D non-linear two-phase BEM/ FEM code named as HYBRID [14][15][16]. Several examples including site response analysis of half-plane, horizontally layered sites, canyons, alluvial valleys and ridge sections subjected to incident P and SV waves were solved in order to show the accuracy and efficiency of this implemented BE algorithm in carrying out site response analysis of topographic structures [31,35,36]. Figure 1 shows the geometry and discretization of a semi-circular canyon subjected to vertically propagating incident SV and P waves of the Ricker type ( Figure 2)…”

Section: Numerical Formulationmentioning

confidence: 99%

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Amplification pattern of 2D semi‐sine‐shaped valleys subjected to vertically propagating incident waves

Kamalian

Gatmiri

Sohrabi-Bidar

et al. 2006

Commun. Numer. Meth. Engng.

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SUMMARYThis paper presents the preliminary results of an extensive numerical parametric study on seismic behaviour of two-dimensional semi-sine-shaped valleys subjected to vertically propagating incident in-plane compression and shear waves. The medium is assumed to have a linear elastic constitutive behaviour. All calculations are executed in time-domain using the direct boundary element method. Clear perspectives of the amplification patterns of the valley are presented by investigation of the frequencydomain responses. It is shown that wavelength, site geometry and in a less order of importance, wave type and material parameters, are the independent key parameters governing the valley's amplification pattern. Some simple rules are obtained which could be used in seismic microzonation and seismic design of structures founded inside the valley.

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Section: Numerical Formulationmentioning

confidence: 99%

Section: Numerical Formulationmentioning

confidence: 99%

Amplification pattern of 2D semi‐sine‐shaped valleys subjected to vertically propagating incident waves

Kamalian

Gatmiri

Sohrabi-Bidar

et al. 2006

Commun. Numer. Meth. Engng.

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“…Generally, numerical studies of the e ect of topographic irregularities on the ground response are multidimensional analyses, which use various approaches such as Finite Element Method (FEM) (e.g., [9,10]); Boundary Element Method (BEM) (e.g., [11,12]); Spectral Element Method (SEM) (e.g., [13]); Finite Di erence Method (FDM) (e.g., [14]); and hybrid methods such as coupled Finite and In nite Element method (FE-IFE) (e.g., [15,16]), and coupled Finite and Boundary Element Method (FEM-BEM) (e.g., [17,18]). Detailed explanation of multidimensional analyses and comparison of results may be found in some references (e.g., [9,19,20]).…”

Section: Introductionmentioning

confidence: 99%

“…The study was also conducted on the e ects of di erent parameters on seismic ground motion, which was based on the vertical propagation of SV waves. Kamalian et al [17] studied the e ects of topography on a medium with heterogeneous materials. They used two-dimensional modeling method based on FEM-BEM.…”

Section: Introductionmentioning

confidence: 99%

Non-linear Seismic Ground Response Analysis Considering Two-dimensional Topographic Irregularities

Soltani

Bagheripour

2017

Scientia Iranica

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Abstract. In the occurrence of an earthquake, local site conditions such as soil characteristics, dimension of topographic irregularities, seismic bedrock depth, etc. as well as characteristics of incident wave have important e ects on seismic ground response. In this study, Finite Element Method (FEM) coupled with viscous boundaries is used to evaluate the e ect of empty two-dimensional valleys on ampli cation or attenuation of seismic waves. Parametric studies are carried out and the e ects of dimension of the topography, frequency of the incident wave, and bedrock depth on the seismic ground response are considered using non-linear method in a time domain analysis. Results are shown by means of horizontal and vertical ampli cation ratios in valley span and its surrounding area. It is concluded that displacement variation on ground surface due to topographical e ects is a considerable factor to select a site location or design structures in the valley mount and its surrounding area.

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“…Study was also conducted on the e ects of di erent parameters on seismic ground motion and based on the vertical propagation of SV waves. Kamalian et al [19] studied the e ects of topography on a medium with heterogeneous materials. They used a two-dimensional modeling method based on Finite Element coupled with Boundary Element (FEM-BEM).…”

Section: Introductionmentioning

confidence: 99%

Seismic Wave Scatter Study in Valleys Using Coupled 2D Finite Element Approach and Absorbing Boundaries

Soltani

Bagheripour

2017

Scientia Iranica

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KEYWORDSGround response; Finite element; Absorbing boundary; Topographic irregularity.Abstract. Topographical and mechanical properties of soil layers can lead to ampli cation or attenuation of seismic waves. Such a phenomenon can be theoretically explained by means of ground response analysis. De nition of boundaries is of great concern in modeling ground response, and application of boundaries with any constrain can lead to the socalled \trap box" e ect on seismic waves in the model, and hence to ctitious results. In the present study, two-dimensional Finite Element Method (FEM) is applied in which boundaries, known as \absorbing boundaries", are used to study the e ect of wave scatter on valleys with di erent forms of the ampli cation or attenuation of SV waves. Comparison of the results is conducted for the current approach and those of the coupling Finite Element and the In nite Element (sometimes called as FE-IFE) method. The results are also presented in non-dimensional diagrams of A u and A v for horizontal and vertical displacement amplitudes, respectively, through the valley span and its surrounding area. Comparison of the results indicate that the proposed boundaries can improve the seismic analysis when coupled with the FEM. Also, because of topographic irregularities, variations of displacement are seen inside the valley and around it.

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Time-domain two-dimensional site response analysis of non-homogeneous topographic structures by a hybrid BE/FE method

Cited by 88 publications

References 17 publications

Amplification pattern of 2D semi‐sine‐shaped valleys subjected to vertically propagating incident waves

Amplification pattern of 2D semi‐sine‐shaped valleys subjected to vertically propagating incident waves

Non-linear Seismic Ground Response Analysis Considering Two-dimensional Topographic Irregularities

Seismic Wave Scatter Study in Valleys Using Coupled 2D Finite Element Approach and Absorbing Boundaries

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