A numerical study on the basin edge effect on soil amplification

İyisan, Recep; Khanbabazadeh, Hadi

doi:10.1007/s10518-013-9451-6

Cited by 27 publications

(8 citation statements)

References 24 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: 72%

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: 72%

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 verification of this analysis has been done by comparing to the solution of Kawase and Aki (1989) [28], and presented at [29] and Khanbabazadeh and Iyisan (2014 a,b) [30][31]. The solution of the trapezoidal valley by Kawase and Aki (1989) [28] has been tested by Zahradnik (1995) [32] and Gil-Zepeda et al (2003) [33], among the others.…”

Section: Analysis Methodsmentioning

confidence: 99%

Basin Edge Effect at Turkish Basins: The Case Study of Dinar and Duzce Basins

Khanbabazadeh¹,

İyisan²,

Hasal³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Several studies have revealed that the inclined bedrock at the sides of the basins bring about the concentration of damages, which well known as basin edge effect. As a seismically active area much of the Turkey lies on the Anatolian Plate. This small plate bounded by two major strike-slip fault zones, the North Anatolian Fault and East Anatolian Fault. During the history, Turkey has been the site of devastating earthquakes. Severe structural damage at basin sides during recent major earthquakes around the world strongly pointed out the importance of basin edge effect. Some of its notable examples can be tracked in Turkey. With respect to the fact that Turkey is among the top 20 percent of all countries exposed to earthquake hazard with regard to mortality and economic losses, the necessity of the investigation and consideration of the basin edge effect in earthquake design codes is revealed. In this study, the dynamic behavior at the edge of two real basins is investigated. In this study, at the first, the basin edge model of the basins are extracted from the data obtained from extensive microtremor surveys and geotechnical investigations as well as insitu studies including SPT, CPT, PS logging tests. Then, the idealized geometry of the Dinar and Duzce basins edge models are proposed. Afterwards, the basins are subjected to the collection of strong ground motions using a fully nonlinear method which works based on explicit finite difference scheme FLAC3D code. The 5566 COMPDYN 2019 7 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

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“…It was found in seismic damage investigation of Tonghai earthquake in 1970, Yongshan-Daguan earthquake of Yunnan province in 1974 and Haicheng earthquake in 1975 that the top and its neighboring positions of low hill site or isolated mounds have a larger seismic response [1,2] . Previous literatures [3][4][5][6] had studied the effects of terrain conditions on the seismic ground motion, analytical solutions of different terrain problems such as arc mounds, depressed river alluvial, and side slope had been given. Wei Rulong et.al [7] had studied the seismic response of bank slope surface in the transition region between rivers and terraces, and it was found that there existed amplification phenomenon of surface ground acceleration.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Analysis on Seismic Response of a Multi-Geomorphic Composite Site

Chen¹,

Dandan²,

Hongmei³

et al. 2015

Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Based on the explicit FE method and parallel computing cluster platform of ABAQUS, a large-scale two-dimensional (2D) nonlinear analytical model for a multi-geomorphic composite site consisting of valley flat, terraces, undulating hilly terrain was established by considering the inhomogeneity of ground soils and influence of terrain change. Nonlinear seismic effect characteristics of the composite site were analyzed, including the peak ground acceleration (PGA), spectral acceleration, duration and acceleration transfer functions. The main results demonstrated that: (1) the PGA of different observation points on the ground surface vary with each other, which was caused by the terrain differences. For the same input motions, the ground surface PGA of valley flat area show obviously larger than that of the first terrace area. (2) the horizontal spectral acceleration of ground surface appears a double-peak or multi-peak phenomena, the spectra shape peak moves to a larger period in the floodplain area compared with that in first terrace area and the period difference comes to be from 0.05s to 0.25s. (3) the sensitive frequency band of seismic site response was 0.5Hz to 1.75Hz, when the frequency is lower than 0.2Hz or higher than 2Hz, the seismic amplification characteristics is not apparent. （4）PGA exhibits spatial variation characteristics which varies in both lateral and depth directions, and there is a non-monotonic decreasing characteristic with soil depth, greater motion amplification and focusing effect of some shallow soil layers were found. In some degree, the 2D results can reflect nonlinear site effect and the influence of lateral heterogeneity of soils on seismic wave propagation.

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A numerical study on the basin edge effect on soil amplification

Cited by 27 publications

References 24 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

Basin Edge Effect at Turkish Basins: The Case Study of Dinar and Duzce Basins

Nonlinear Analysis on Seismic Response of a Multi-Geomorphic Composite Site

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