2D non-linear seismic response of the Dinar basin,TURKEY

Khanbabazadeh, Hadi; İyisan, Recep; Ansal, Atilla; Haşal, M. Emre

doi:10.1016/j.soildyn.2016.07.021

Cited by 18 publications

(7 citation statements)

References 25 publications

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“…Somerville et al (2003) asserted that commonly used empirical approaches do not reflect the additional effects of sedimentary basins. In relevant studies, Semblat et al (2005), Bard et al (2010), Iyisan and Hasal (2011), Iyisan and Khanbabazadeh (2013), Abraham et al (2016), Khanbabazadeh et al (2016), Riga et al (2016), Chávez-García (2016), Chávez-García FJ et al (2018), Cipta et al (2018), Moczo et al (2018), Zhu et al (2018), the results found in the two-dimensional numerical analyses support this situation. In the current researches, Hasal et al (2018), Khanbabazadeh et al (2018;2019), Ozaslan et al (2020), it has been studied by time-domain dynamic analyses in idealized 2D models of Dinar and Düzce basins.…”

Section: Introductionmentioning

confidence: 73%

Assessment of the Design Spectrum with Aggravation Factors by 2D Nonlinear Numerical Analyses: A Case Study in Gemlik Basin, Turkey

Özaslan

İyisan

Hasal

et al. 2021

Preprint

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The response spectra of multidimensional analyses are compared with the one-dimensional (1D) local models to couple the irregular soil stratification effect in a site. In recent studies, the surface motion spectra ratios of 2D/1D or 3D/1D are defined as spectral aggravation factors for each region in a site. Particularly in alluvial basins, where the soil media is typically formed by fault ruptures or topographic depressions filled with sediments, the inclination of the rock outcrop in the edge of the basin has a considerable effect on the site response, and such effect has not yet been taken into consideration of recent seismic building codes and general engineering applications. In this study, the natural alluvial basin near the North Anatolian Fault in Gemlik, Maramara Region, Turkey, was investigated by 40 seismic site tests and 4 validation borings. The 2D and 1D nonlinear response history analyses in north-south and east-west directions of the Gemlik basin were performed by numerical model on finite difference scheme considering nonlinear elasto-plastic material behaviors and geometric discontinuities. 22 strong ground motions recorded on rock site are excited vertically as SH waves. The numerical results exhibited the narrow basin effects are derived not only by reflection, refraction, and shifting behavior but also by focusing and superposition of the seismic waves propagating from both opposite basin edges. As a result, the site-specific spectral aggravation factors, SAF2D/1D defined by the ratio between the 2D and 1D acceleration response spectra for each period and any location on the site, were proposed for the Gemlik basin. The variations of the aggravation factors were observed as increasing values to 1.2–2.2 on the near edge and basin center.

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Section: Introductionmentioning

confidence: 73%

Assessment of the Design Spectrum with Aggravation Factors by 2D Nonlinear Numerical Analyses: A Case Study in Gemlik Basin, Turkey

Özaslan

İyisan

Hasal

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Somerville et al (2003) asserted that commonly used empirical approaches do not reflect the additional effects of sedimentary basins. In relevant studies, Semblat et al (2005), Bard et al (2010), Iyisan and Hasal (2011), Iyisan and Khanbabazadeh (2013), Abraham et al (2016), Khanbabazadeh et al (2016), Riga et al (2016), Chávez-García (2016), Chávez-García FJ et al (2018), Cipta et al (2018), Moczo et al (2018), Zhu et al (2018), the results found in the two-dimensional numerical analyses support this situation. In the current researches, Hasal et al (2018), Khanbabazadeh et al (2018;2019), Ozaslan et al (2020, it has been studied by time-domain dynamic analyses in idealized 2D models of Dinar and Düzce basins.…”

Section: Introductionmentioning

confidence: 74%

Assessment of the design spectrum with aggravation factors by 2D nonlinear numerical analyses: a case study in the Gemlik Basin, Turkey

Özaslan

İyisan

Haşal

et al. 2022

Bull Earthquake Eng

Self Cite

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The response spectra of multidimensional analyses are compared with the one-dimensional (1D) local models to couple the irregular soil stratification effect in a site. In recent studies, the surface motion spectra ratios of 2D/1D or 3D/1D are defined as spectral aggravation factors for each region in a site. Particularly in alluvial basins, where the soil media is typically formed by fault ruptures or topographic depressions filled with sediments, the inclination of the rock outcrop in the edge of the basin has a considerable effect on the site response, and such effect has not yet been taken into consideration of recent seismic building codes and general engineering applications. In this study, the natural alluvial basin near the North Anatolian Fault in Gemlik, Maramara Region, Turkey, was investigated by 40 seismic site tests and 4 validation borings. The 2D and 1D nonlinear response history analyses in north-south and eastwest directions of the Gemlik basin were performed by numerical model on finite difference scheme considering nonlinear elasto-plastic material behaviors and geometric discontinuities. 22 strong ground motions recorded on rock site are excited vertically as SH waves. The numerical results exhibited the narrow basin effects are derived not only by reflection, refraction, and shifting behavior but also by focusing and superposition of the seismic waves propagating from both opposite basin edges. As a result, the site-specific spectral aggravation factors, SAF2D/1D defined by the ratio between the 2D and 1D acceleration response spectra for each period and any location on the site, were proposed for the Gemlik basin. The variations of the aggravation factors were observed as increasing values to 1.2-2.2 on the near edge and basin center.

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“…Also, the 2D site response results were compared with conventional 1D site response results using the program DEEPSOIL. These are the two commonly used programs in the field of site response analysis for the last two decades [DEEPSOIL - Hashash and Park, 2001;Phanikanth et al, 2011;Abhishek et al, 2013;FLAC 2D -Movahedasi and Ghayamghamian, 2015;Khanbabazadeh et al, 2016;Rayhani et al, 2007].…”

Section: Radar (Gpr) Multi-channel Analysis Of Surface Waves (Masw) mentioning

confidence: 99%

2D nonlinear site response analysis of shallow bedrock sites using integrated subsurface profiles

Chandran

Anbazhagan

2020

Annals of Geophysics

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In this study, an attempt has been made to generate the subsurface profiles using integrated geophysical approach and a site-specific 2-D nonlinear site response analysis at shallow bedrock sites in Peninsular India. The site selected for the study is Tarapur, India in which three survey lines were selected for the sub-surface mapping. The subsurface profiling of these three locations was done by an integrated geophysical approach by carrying out Multichannel Analysis of Surface Waves-2D survey, Ground Penetrating Radar survey, and conventional drilling borehole and measurement of Standard Penetration Test N values. Thirteen intraplate recordings from all around the world are selected for the site response analysis. The subsurface profiles generated by the integrated geophysical approaches are modeled in FLAC-2D nonlinear module and site response parameters are estimated. Further 1D site response analyses are carried out at selected points in 2-D profiles using the program DEEPSOIL and the 2D site response results are compared. Results of site response analysis are expressed in terms of short-period amplification factor (Fc) and long period amplification factor (Fs) and the results show that the 2D geometry of sub-surface is more sensitive to the higher frequency content of ground motion especially for subsurface with more heterogeneities. Also, a parametric study has been done on a synthetic 2D profile to quantitatively evaluate the effect of different ground motion characteristics like amplitude and frequency content on 2D site response analysis. The parametric study shows that underground heterogeneity is very sensitive to the ground motions with high-frequency content and low amplitude.

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2D non-linear seismic response of the Dinar basin,TURKEY

Cited by 18 publications

References 25 publications

Assessment of the Design Spectrum with Aggravation Factors by 2D Nonlinear Numerical Analyses: A Case Study in Gemlik Basin, Turkey

Assessment of the Design Spectrum with Aggravation Factors by 2D Nonlinear Numerical Analyses: A Case Study in Gemlik Basin, Turkey

Assessment of the design spectrum with aggravation factors by 2D nonlinear numerical analyses: a case study in the Gemlik Basin, Turkey

2D nonlinear site response analysis of shallow bedrock sites using integrated subsurface profiles

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