Soil properties and applications review with NERA (nonlinear earthquake site response analyses) in İstanbul-MARMARAY Project between Kazliçeşme to Sirkeci

Beyhan, Günay; Keskinsezer, Ayhan; Öztürk, Sema

doi:10.1007/s12665-015-4783-y

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…Therefore, it is possible to narrow down the studies in which analyses were performed for shallower depths (Yıldız, 2022). Especially, for large investigation areas, the number of boreholes can be very large; accordingly, the thickness and properties of the soil strata along the boreholes can vary considerably, requiring the adoption of NLA (Beyhan et al., 2016). In the first place, it should be remembered that the thickness of the soil profile directly affects the dominant frequency of the soil column (Krylov et al., 2021).…”

Section: Resultsmentioning

confidence: 99%

Influence of input motion and surface layer properties on seismic site response: A stochastic simulation method–based MLR model

Yıldız

2023

Near Surface Geophysics

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Seismic site response analyses are simulations in which the effects of geological conditions on seismic waves are examined. The uncertainties that make these analyses crucial are defined as the source of motion, the travel path of seismic waves, and geological conditions. In this study, a series of non-linear seismic response analyses were performed using data from site investigation studies. The results of non-linear analyses performed under earthquakes with different characteristics based on real soil data were investigated in terms of acceleration time histories and response spectra. The relationship between site response with the surface layer properties and input motion properties used in the simulations was examined in a parametrical manner. Based on the results obtained, Monte Carlo simulation, which is a stochastic data simulation method, was performed. Additionally, multiple regression and variance analysis (ANOVA) was performed on the dataset created by both site response analysis and stochastic simulations. The MLR model displayed highly accurate results with a coefficient of determination, R 2 of 0.9763, and a standard error of 0.109. The efficiency level of the independent variables used as input parameters in the simulations on the dependent variable, AF was examined. It was revealed that the coefficient of lateral earth pressure at rest (K o ), earthquake motion (i.e., PGA of input motion) and surface layer thickness (d surface ) from the soil properties had the highest effect on the amplification factor.

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Section: Resultsmentioning

confidence: 99%

Influence of input motion and surface layer properties on seismic site response: A stochastic simulation method–based MLR model

Yıldız

2023

Near Surface Geophysics

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“…The equivalent linear model has been one of the most commonly used approaches in modeling the ground linearity. The fact that the soil is nonlinearity can significantly affect the seismic response of the soil [ Beyhan et al, 2016;Biondi et al, 2014;Campione et al, 2013] and therefore must be determined with caution. By approximating the actual nonlinear, inelastic response of soil, an equivalent linear approach was suggested by Schnabel et al [1972].…”

Section: Es4004mentioning

confidence: 99%

Investigation of the soil structure of the area between Yedikule to Sirkeci (\.{I}stanbul) using PS logging and earthquake data

Keskinsezer¹,

Beyhan²,

Gallajov³

2019

Russ. J. Earth Sci.

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Marmara Region is located in northwestern Turkey, and the average elevation is of the least. Despite the small size of the region population, its density is above the average of Turkey. The North Anatolian Fault Zone (NAFZ) passing through this region is a fracture that can be observed clearly in its structural characteristics. This region is one of the very active regions in terms of seismic activity when viewed in the historical process. For this reason, earthquake risk analysis is very important for urban planning, construction and major engineering projects such asİstanbul Metro. This engineering project, which has a worldwide design, has a length of 76 km. Not only it connects Asia and Europe with railways, but also provides urban transportation in a fast and convenient way. In this study, the part of theİstanbul Metro between Yedikule and Sirkeci on the European continent is investigated. Numerous boreholes were opened in this project line, but here 7 of the best representatives of the region were selected and examined in this study. These boreholes have a depth of about 60 m and have penetrated many geological layers and formations in this region. In this study, we used average velocities of P and S waves in layers, density, and thickness and formation data based on the PS logs in selected 7 boreholes of Yedikule-Sirkeci line. The influences of linearity on the site response analysis have been detected and evaluated with numerical examples. The earthquake data needful for the Equivalent Linear Earthquake Site Response Analyses computer program solution is the Kocaeli earthquake data on 17 August 1999, which was recorded at the earthquake station in Beşiktaş-İstanbul. In addition to Kocaeli earthquake data, the soil parameters from the boreholes are also transferred and calculated. Thus, important ground features of the area where the engineering structure with huge dimensions are to be constructed have been determined.

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“…In another study, the ground response functions at the free surface in different geological locations in the metropolitan area of İstanbul have been obtained using average wave velocities, thicknesses, and densities of the geological layers based on the PS logs from seven different boring logs with depth ranging from 43 to 60 m during the MARMARAY Project. The E-W component of the acceleration record of the August 17, 1999 Kocaeli earthquake at Beşiktas¸ district on the rock has been transferred to NERA software to obtain response and design spectrums that are considered to be crucial during earthquake strong ground motion [26].…”

Section: Introductionmentioning

confidence: 99%

A comparative study on Soil Properties and Applications Review with EERA and NERA in İstanbul-MARMARAY Project between Kazlıçeşme to Sirkeci

Beyhan¹,

Keskinsezer²,

Beyhan³

2017

PEN

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Over the course of history Marmara region in Northwestern Turkey has been the site of numerous destructive earthquakes. Based on historical and instrumental earthquake records, the Marmara sea region is one of the most seismically active regions of the Eastern Mediterranean. The Marmara region is under the influence of the western part of the North Anatolian Fault Zone (NAFZ) and the N-S extensional regime of Western Turkey. Therefore, the earthquake risk analysis is very important for the MARMARAY Project. 76 km-long MARMARAY Project is an important project not only for Turkey but also for the world because it joins the two continents through railway. It will also serve for a comfortable and healthy way of environment, providing a contemporary solution for urban transportation. Geotechnical and geological parameters of the region were obtained from analyses of seven boreholes. In this paper, using average wave velocities in layers, thickness, density and formation data based on the PS logs, 43 m and 65.5 m depths ranging from 7 different boring logs in a ground-wise different geological regions in İstanbul, ground response functions were obtained. Based on the soil profiles transferred to EERA (Equivalent-Linear Earthquake Site Response Analyses of Layered Soil Deposits) and NERA (Nonlinear Earthquake Site Response Analyses of Layered Soil Deposits) softwares, the rock soil record of August 17, 1999 Kocaeli earthquake in İstanbul-Beşiktaş Ministry of Public Works and Settlement (IBMPWS), response and design spectrums that may be considered crucial in case of an earthquake were obtained. The acceleration record was used as an input motion having PGA value of 0,04287 g (east-west component) which was applied on sublayers (i.e. sand, gravel, clay) using EERA and NERA programs. The analysis is done by keeping constant damping ratio of 5%. Also nonlinear analysis was compared with the linear method of analysis. Stages involved in ground response analyses to develop site-specific response spectra at a soil site are summarized. Some of the known site response analysis methods are summarized and similarities and diff erences between linear and nonlinear methods.

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Soil properties and applications review with NERA (nonlinear earthquake site response analyses) in İstanbul-MARMARAY Project between Kazliçeşme to Sirkeci

Cited by 5 publications

References 23 publications

Influence of input motion and surface layer properties on seismic site response: A stochastic simulation method–based MLR model

Influence of input motion and surface layer properties on seismic site response: A stochastic simulation method–based MLR model

Investigation of the soil structure of the area between Yedikule to Sirkeci (\.{I}stanbul) using PS logging and earthquake data

A comparative study on Soil Properties and Applications Review with EERA and NERA in İstanbul-MARMARAY Project between Kazlıçeşme to Sirkeci

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