Evaluation of site response characteristic using nonlinear method (Case study: Babol, Iran)

Choobbasti, Asskar Janalizadeh; Rezaei, Sadegh; Farrokhzad, F.; Azar, P.

doi:10.1007/s11709-014-0231-4

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…In order to determine the properties of soil layers within the study area, a geotechnical investigation programme including 25 boreholes up to 40-m depth was performed. According to this investigation, a zonation for Babol including riverside, central part, far side, ancient lake and north-west has been proposed by Choobbasti, Rezaei, Farrokhzad, and Azar (2014) with respect to ground characterisation. In this study, however, six boreholes from each zone with the depth of 15 m to 30 m have been selected (Figure 1).…”

Section: Soil Investigationmentioning

confidence: 99%

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Ghalesari

Choobbasti

2016

European Journal of Environmental and Civil Engineering

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Piled raft foundations are the composite construction of a spread foundation and a few number of piles that are usually used in soft soils to compensate the weakness of a raft in satisfying the design requirements. Due to the complex behaviour of piled raft, it is necessary to take into account a number of factors such as pile geometry and arrangement, raft thicknesses, soil properties and loading condition in the design. In this study, a parametric study has been conducted by a three-dimensional finite-element method considering the full interaction between the components of piled raft foundation. The underlying soil consists of Babol clay in drained condition with various stiffness and plasticity, determined from the results of a geotechnical investigation. The results of numerical analyses show that the bearing capacity of piled raft obviously increases with increasing pile length, pile spacing and raft thickness, especially in stiff clay. The effect of load type is more significant for the differential settlement and pile loads than other parameters. Finally, the advantages of using an optimum design method are examined in a special case of analyses and a case history.

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Section: Soil Investigationmentioning

confidence: 99%

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Ghalesari

Choobbasti

2016

European Journal of Environmental and Civil Engineering

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“…Microtremors are ground vibrations with displacement amplitude about 1-10 micron, and velocity amplitude is 0.001-0.01 cm/s that can be detected by seismograph with high magnification (Rezaei and Choobbasti 2014). Many investigations have been conducted to determine the nature of microtremors.…”

Section: Methodsmentioning

confidence: 99%

“…Many theoretical and experimental studies show that, this method has the capability of estimation of two important site response parameters (amplification factor and peak frequency) (Nakamura 1989;Milana et al 2011;Choobbasti et al 2014;Purnachandra Rao et al 2011). …”

Section: Methodsmentioning

confidence: 99%

Application of the microtremor measurements to a site effect study

Rezaei

Choobbasti

2017

Earthq Sci

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Earthquake has left much life and property damages. The occurrence of such events necessitates the execution of plans for combating the earthquakes. One of the most important methods for combating earthquakes includes assessing dynamic characteristics of soil and site effect. One of the methods by which one can state dynamic characteristics of the soil of an area is the measurement of microtremors. Microtremors are small-scale vibrations that occur in the ground and have an amplitude range of about 0.1-1 microns. Microtremor measurement is fast, applicable, cost-effective. Microtremor measurements were taken at 15 stations in the Babol, north of Iran. Regarding H/V spectral ratio method, peak frequency and amplification factor were calculated for all microtremor stations. According to the analysis, the peak frequency varies from 0.67 to 8.10 Hz within the study area. Also, the authors investigated the validity of the results by comparing them with SESAME guidelines and geotechnical conditions of study area. The microtremor analysis results are consistent with SESAME guidelines and geotechnical condition of study area. The results show that the microtremor observations are acceptable methods for assessing dynamic characteristics of soil and site effect in the Babol City.

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“…These are inactive ground motions with displacement amplitudes that can be signified by seismograph with high amplification. Many scholars use the Horizontal Vertical Spectral Ratio (HVSR) Technique to observe soil properties that affect the vulnerability of sites to earthquake (Rezaei and Choobbasti, 2014;Nakamura, 1989;Paudyal et al, 2013;Fnais et al, 2010;Beroya et al, 2009;Jiyang et al, 2016;Stanko et al, 2017;Gosar, 2007;Mucciarelli et al, 2001;Pamuk et al, 2017). By utilizing the H/V ratio, the soil fundamental period (T0) and the amplification factor (Ag) of the site were determined (Tarabusi and Caputo, 2017;Stanko et al, 2017;Hardesty et al, 2010;Özdağ et al, 2015).…”

Section: * Corresponding Authormentioning

confidence: 99%

“…Earthquakes exemplify a massive natural hazard, resulting in casualties and major damage to buildings and businesses. In order to protect human lives and their properties, various scholars indicate the need for a complete research on earthquake`s risks by estimating the ground motions (Choobbasti et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Vulnerability Index Assessment Using Neural Networks (Viann): A Case Study of Nicosia, Cyprus

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Dimililer

Özdağ

et al. 2017

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Many scholars have used microtremor applications to evaluate the vulnerability index. In order to reach fast and reliable results, microtremor measurement is preferred as it is a cost-effective method. In this paper, the vulnerability index will be reviewed by utilization of microtremor measurement results in Nicosia city. 100 measurement stations have been used to collect microtremor data and the data were analysed by using Nakamura's method. The value of vulnerability index (Kg) has been evaluated by using the fundamental frequency and amplification factor. The results obtained by the artificial neural network (ANN) will be compared with microtremor measurements. Vulnerability Index Assessment using Neural Networks (VIANN) is a backpropagation neural network, which uses the original input microtremor Horizontal Vertical Spectrum Ratio (HVSR) spectrum set. A 3-layer back propagation neural network which contains 4096 input, 28 hidden and 3 output neurons are used in this suggested system. The output neurons are classified according to acceleration sensitivity zone, velocity zones, or displacement zones.

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Evaluation of site response characteristic using nonlinear method (Case study: Babol, Iran)

Cited by 11 publications

References 16 publications

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Application of the microtremor measurements to a site effect study

Vulnerability Index Assessment Using Neural Networks (Viann): A Case Study of Nicosia, Cyprus

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