Relevant bibliographies by topics / Impedance of foundation

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Impedance of foundation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Impedance of foundation"

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Crouse, C. B., George C. Liang, and Geoffrey R. Martin. "Experimental Foundation Impedance Functions." Journal of Geotechnical Engineering 111, no. 6 (June 1985): 819–22. http://dx.doi.org/10.1061/(asce)0733-9410(1985)111:6(819).

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Lian, Jiang, Dong, Zhao, and Zhao. "Dynamic Impedance of the Wide-Shallow Bucket Foundation for Offshore Wind Turbine using Coupled Finite–Infinite Element Method." Energies 12, no. 22 (November 16, 2019): 4370. http://dx.doi.org/10.3390/en12224370.

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The dynamic impedances of foundation play an important role in the dynamic behavior and structural stability of offshore wind turbines (OWT). Though the behaviors of bucket foundation, which are considered as a relatively innovative foundation type under static loading, have been extensively investigated, the corresponding dynamic performances were neglected in previous research. This study focuses on the dynamic impedances of wide-shallow bucket foundations (WSBF) under the horizontal and rocking loads. Firstly, the numerical model was established to obtain the dynamic impedances of WSBF using the coupled finite-infinite element technique (FE-IFE). The crucial parameters affecting the dynamic responses of WSBF are investigated. It is shown that the skirt length mainly affects the rocking dynamic impedance and the diameter significantly affects the horizontal and coupling impedances, especially when the diameter is larger than 34 m. The overall dynamic responses of WSBF are profoundly affected by the relative soil thickness and the multi-layer soil stiffness. Additionally, dynamic impedances of WSBF are insensitive to the homogeneous soil stiffness. Lastly, the safety threshold curve was calculated according to the OWT, which can provide essential reference for the design of the OWT supported by large scale WSBF.
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Crouse, C. B., Behnam Hushmand, J. Enrique Luco, and H. L. Wong. "Foundation Impedance Functions: Theory Versus Experiment." Journal of Geotechnical Engineering 116, no. 3 (March 1990): 432–49. http://dx.doi.org/10.1061/(asce)0733-9410(1990)116:3(432).

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Ashoori, Taha, and Keivan Pakiman. "Dynamic Response of Different Types of Shallow Foundation over Sandy Soils to Horizontal Harmonic Loading." International Journal of Geotechnical Earthquake Engineering 6, no. 1 (January 2015): 1–14. http://dx.doi.org/10.4018/ijgee.2015010101.

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Increasing requirements of industries and research institutes to analytically results of interaction soil-foundation related systems, reveals the importance of the dynamic impedance functions than ever before. The dynamic impedance function relations are presented for mass less rigid foundations which is possible to obtain dynamic response of foundations for different frequencies and masses accordingly. In this study, the dynamic impedance functions were investigated using physical modeling tests on sandy soil with finite thickness soil stratum over bedrock. The tests were carried out inside a steel container of dimensions 1×1×0.8m in length, width and height respectively which was filled into container with Babolsar sand by using air – pluviation technique after calibration test with relative density of 55.1 percent. The selected foundations were square and circular with same surface area and rectangular with length to width ratio of 2 that were investigated to determine effects of shape, inertia, embedment ratio, dynamic force amplitude and bedrock on horizontal impedance.
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Wang, Hong Fang, Jiang Chun Hu, and Zhen Xia Yuan. "The Mathematical Foundation of Rock Electrochemical Impedance Spectroscopy." Advanced Materials Research 446-449 (January 2012): 1703–8. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1703.

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The electromagnetic characteristics of rock and ore play an important role in resources, engineering and environmental fields. The high frequency part of rock electrochemical impedance spectroscopy can reveal its crack characteristics according to the test results and rock physical model and equivalent circuit. The mathematical foundation of high frequency part of rock electrochemical impedance spectroscopy is studied, and the ideal Nyquist figure is obtained from that, and the response characteristics of rock electrochemical impedance spectroscopy volume arc are been proofed. It provides the theory basis for further study rock electrochemical detection technology.
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He, Fang Ding, Guang Jun Guo, and Yang Yang. "Research on Dynamic Impedance Function for Horizontal Vibration of Single Pile." Applied Mechanics and Materials 90-93 (September 2011): 393–401. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.393.

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The horizontal vibration characteristic of the pile foundation is a key technology in dynamic design of foundation engineering. By researching on the horizontal harmonic loads in layered foundation, use horizontal vibration answers of buried foundation to deal with horizontal vibration impedance problems of pile tip. The transition matrix can be used to analyze the dynamic impedance function for horizontal vibration of pile foundation in layered foundation. And results in the paper is checked with traditional methods, which shows the both results fitting well.
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LIOU, Gin-Show. "IMPEDANCE FOR RIGID SQUARE FOUNDATION ON LAYERED MEDIUM." Doboku Gakkai Ronbunshu, no. 471 (1993): 47–57. http://dx.doi.org/10.2208/jscej.1993.471_47.

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Wang, Hong Fang, Jiang Chun Hu, and Zhen Xia Yuan. "The Mathematical Foundation of Rock Electrochemical Impedance Spectroscopy." Advanced Materials Research 446-449 (January 2012): 1703–8. http://dx.doi.org/10.4028/scientific5/amr.446-449.1703.

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Luco, J. E., and H. L. Wong. "Identification of Soil Properties from Foundation Impedance Functions." Journal of Geotechnical Engineering 118, no. 5 (May 1992): 780–95. http://dx.doi.org/10.1061/(asce)0733-9410(1992)118:5(780).

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Ahmad, S., and A. K. Rupani. "Horizontal impedance of square foundation in layered soil." Soil Dynamics and Earthquake Engineering 18, no. 1 (January 1999): 59–69. http://dx.doi.org/10.1016/s0267-7261(98)00028-1.

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Dissertations / Theses on the topic "Impedance of foundation"

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Yilmazok, Ozgun. "An Investigation Of Accuracy Of Inertial Interaction Analyses With Frequency-independent Impedance Coefficients." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12609030/index.pdf.

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AN INVESTIGATION OF ACCURACY OF INERTIAL INTERACTION ANALYSES WITH FREQUENCY-INDEPENDENT IMPEDANCE COEFFICIENTS Yilmazok, Ö
zgü
n M.S., Department of Civil Engineering Supervisor: Assoc. Prof. Dr. B. Sadik Bakir November 2007, 79 pages The inertial interaction between the soil and structure alters dynamic response characteristics of a structure due to foundation deformability, such that the flexibility and energy dissipation capability of surrounding soil may lead to a significant increase in period and damping of structural oscillations. The inertial interaction analyses can be accomplished through utilisation of frequency dependent foundation impedance coefficients that are reported in literature for various soil conditions and foundation types. However, such analyses should be performed in frequency domain, and applicable to only cases that linear structural response is considered. Alternatively, equivalent frequencyindependent foundation impedance coefficients can be employed, such that a constant excitation frequency is assumed in calculation of these coefficients. In this study, it is assumed that the fundamental frequency of a fixed-base structure, which can be obtained through employing available empirical relationships or a modal analysis, can be substituted for excitation terms in impedance expressions. The error induced in calculation of peak structural distortions is investigated through comparisons of structural response due to frequency-dependent and frequency-independent foundation impedance coefficients. For analyses, a linear single-degree of freedom oscillator is considered for modeling the structure. The frequency-dependent impedance of a rigid disk foundation resting on elastic halfspace is simulated by a limited number of discrete elements. The response calculations are performed in frequency domain, through employing 72 acceleration records. It is concluded that, the natural frequency of fixed-base building can be considered as effective excitation frequency for calculation of foundation impedance coefficients, when the effect of inertial interaction on structural response is moderate. Through employing equivalent-linear approximation for the structural response, it is shown that the conclusion is also valid in cases that nonlinear structural response is considered. However, when the inertial interaction has more profound effects on the structural response, the use of natural frequency of flexible-base structure, which is calculated iteratively due to its dependence on foundation-impedance factors is recommended.
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Taymus, Refik Burak. "An Assessment Of Winkler Model For Simulation Of Shallow Foundation Uplift." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609784/index.pdf.

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Foundation uplift is the partial separation of a shallow foundation from soil due to excessive load eccentricity. Foundation uplift can significantly change the seismic response of slender structures, and frames as well. In literature, different support models for foundations are employed in order to simulate foundation uplift in seismic analysis of structures. One of the most widely used models is the Winkler model which assumes distributed tensionless springs beneath a shallow foundation. In this study, two simple algorithms are developed in order to compute static and dynamic response of foundations on tensionless supports. Any formula given in literature for calculation of foundation impedance coefficients can be easily introduced in these algorithms. Hence, the use of Winkler model is critically evaluated through comparisons with the response of a foundation on elastic halfspace. For that purpose, available impedance formulas given for a shallow rectangular foundation on elastic halfspace are used. It is concluded that, the coupling between vertical displacement and rocking of foundation is very significant during uplift. Therefore, the accuracy of Winkler model in uplift v simulation is limited, since the model cannot simulate vertical and rocking response of a shallow foundation concurrently with a single spring coefficient.
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Theland, Freddie. "Prediction and experimental validation of dynamic soil-structure interaction of an end-bearing pile foundation in soft clay." Licentiate thesis, KTH, Bro- och stålbyggnad, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291021.

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In the built environment, human activities such as railway and road traffic, constructionworks or industrial manufacturing can give rise to ground borne vibrations. Such vibrations become a concern in urban areas as they can cause human discomfort or disruption of vibration sensitive equipment in buildings. In Sweden, geological formations of soft clay soils overlying till and a high quality bedrock are encountered in densely populated areas, which are soil conditions that are prone to high levels of ground borne vibrations. Under such soil conditions, end-bearing piles are often used in the design of building foundations. The dynamic response of a building is governed by the interaction between the soil and the foundation. It is therefore essential that models used for vibration predictions are able to capture the dynamic soil-structure interaction of pile foundations. The purpose of this thesis is to experimentally and numerically investigate dynamic soil-structure interaction of an end-bearing pile group in clay by constructing a test foundation of realistic dimensions. The small-strain properties in a shallow clay deposit are estimated using different site investigation and laboratory methods. The results are synthesised into a representative soil model to compute the free-field surface response, which is validated with vibration measurements performed at the site. It is found that detailed information regarding material damping in the clay and the topmost soil layer both have a profound influence on the predicted surface response, especially with an increasing distance from the source. Dynamic impedances of four end-bearing concrete piles driven at the site are measured. Pile-soil-pile interaction is investigated by measuring the response of the neighbour piles when one of the piles in the group is excited. The square pile group is subsequently joined in a concrete cap and measurements of the impedances of the pilegroup and acceleration measurements within the piles at depth are performed. A numerical model based on the identified soil properties is implemented and validated by the measurements. A good agreement between the predicted and measured responses and impedances of the pile group foundation is found, establishing confidence in the ability to predict the dynamic characteristics of end-bearing pile foundations under the studied soil conditions.
Mänsklig verksamhet i urbana miljöer så som väg- och järnvägstrafik, byggnation eller maskindrift inom industri kan ge upphov till vibrationer som sprider sig via marken i närområdet. Dessa vibrationer kan ge upphov till kännbara vibrationer eller påverka vibrationskänslig utrustning i byggnader. I Sverige förekommer ofta mjuka lerjordar ovanpå berg, och inte sällan i tätbebyggda områden. Under sådana jordförhållanden används ofta spetsbärande pålar för grundläggning av byggnader. Det dynamiska verkningssättet för byggnader är beroende av interaktionen mellan jorden och byggnadens grund. Det är därför viktigt att modeller som används för vibrationsanalys i byggnader kan beskriva denna interaktion mellan jord och byggnadsfundament. Syftet med denna avhandling är att experimentellt och via numeriska modeller studera dynamisk jord-struktur-interaktion av ett spetsbärande pålfundament i lera. Jordensmekaniska egenskaper vid små töjningar utvärderas för en lerjord som är avsatt på morän och berg genom både fältförsök och laboratorieanalyser av prover. Informationen kombineras för att konstruera en lagerförd jordmodell av platsen för att beräkna jordens dynamiska respons till följd av en punktlast. Modellen valideras med vibrationsmätningar som utförts på platsen. Studien visar att detaljerad information angående lerans materialdämpning och de mekaniska egenskaperna av jordens översta lager har en stor inverkan på förutsägelser av jordens dynamiska respons vid ytan, speciellt vid stora avstånd från vibrationskällan. Experimentella tester utförs för att mäta dynamiska impedanser av fyra slagna spetsbärande betongpålar. Interaktionen mellan pålarna utvärderas genom att utföra mätningarav de omgivande pålarnas respons till följd av excitering av en påle. Pålgruppen sammanfogas därefter i ett betongfundament och impedanserna samt accelerationer inuti pålarna uppmäts. En numerisk modell baserad på de identifierade mekaniska egenskaperna av jorden upprättas och valideras genom mätningarna. De numeriska resultaten är i god överensstämmelse med de uppmätta vilket styrker användningen av numeriska modeller för att förutsäga interaktionen mellan jord och spetsbärandepålar under de studerade jordförhållandena.

QC 20210302

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Strand, Tommy, and Johannes Severin. "Soil-Structure Interaction of Pile Groups for High-Speed Railway Bridges." Thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231413.

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Kermani, Behnoud. "Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods." Master's thesis, Temple University Libraries, 2013. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/234113.

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Civil Engineering
M.S.C.E.
Proper design of bridge structures requires an appreciation for the possible failure mechanisms that can develop over the lifetime of the bridge, many of which are related to natural hazards. For example, scour is one of the most common causes of bridge failures. Scour occurs due to the erosion of soil and sediment within a channel with flowing water. During a flood event, the extent of scour can be so great that it can destabilize an existing bridge structure. In order to evaluate the scour potential of a bridge, it is necessary to have information regarding the substructure, particularly the bridge foundations. However, as of 2011 there are more than 40,000 bridges across United States with unknown foundations. Generally for these bridges there are no design or as-built plans available to show the type, depth, geometry, or materials incorporated into the foundations. Several non-destructive testing (NDT) methods have been developed to evaluate these unknown foundations. The primary objective of this research is to identify the most current and widely used NDT methods for determining the embedment depth of unknown bridge foundations and to compare these methods to an ultrasonic P-wave reflection imaging system. The ultrasonic P-wave reflection system has tremendous potential to provide more information and address several short-comings of other NDT methods. A laboratory study was initiated to explore various aspects related to the P-wave system performance, in order to characterize the limitations of the system in evaluation of unknown foundations prior to deployment in field studies. Moreover, field testing was performed using the P-wave system and a number of the current NDT methods at two selected bridge foundations to allow comparison between the results.
Temple University--Theses
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Ropars, Pierre. "Modélisation des vibrations d'origine ferroviaire transmises aux bâtiments par le sol." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00681780.

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Ce document propose une modélisation indirecte par sous-structuration des vibrations d'origine ferroviaire transmises aux bâtiments par le sol. La méthodologie globale est empruntée à la méthode des mobilités dans laquelle chaque sous-structure est caractérisée par sa mobilité. L'excitation est représentée par une force ponctuelle en surface du sol ou par une ligne de forces décorréllées. Elle est néanmoins calibrée sur des résultats expérimentaux. Une attention particulière a été portée à la caractérisation des comportements vibratoires des éléments du problème. La plupart des représentations de l'ensemble sol-fondations est effectuée à l'aide d'un code FEM-BEM en 2 et 2.5 dimensions. Le bâtiment est modélisé par différentes techniques : FEM, BEM, SEA et ondulatoire. Une approche probabiliste permet d'évaluer l'impact de la variabilité des sols environnent sur la mobilité des fondations. Les impédances stochastiques qui en découlent sont intégrées aux modèles de propagation. Leurs impacts sur les vibrations du bâtiment sont alors accessibles. La méthodologie permet d'obtenir les niveaux vibratoires des composantes du bâtiment
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LIANG, LI-ZHONG, and 梁立忠. "Impedance matrix for embedded axial symmetric foundation." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/63093244211026141380.

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Huai-Yu, Kao, and 高懷豫. "Effects of Foundation Flexibility on Dynamic Impedance Functions." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/48377615242661347000.

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碩士
中原大學
土木工程研究所
86
In the past few decades, researchers have proposed many methods to investigate the dynamic impedance functions for different foundation-soil systems. However, compared with the work on rigid foundations, the research for the impedance functions of flexible foundations has been very limited due to its complexity. By applying a finite element methodology performed in the time domain, the impedance functions for various shapes of flexible foundations subject to vibration in different directions are systematically investigated in this study. Accordingly, the effects of foundation flexibility on the impedance functions can be extensively assessed. Furthermore, a reliable methodology is established for future applications to more complicated soil-foundation system. From the results obtained in the study, the effects of foundation flexibility on the impedance functions of circular foundations under vertical vibration is much more prominent than all the other vibrating directions. On the other hand, the effects of foundation flexibility are not significant for strip foundations under horizontal vibration whereas the corresponding impedance functions under rocking vibration are considerably affected. As to the square foundations, the effects of foundation flexibility are more prominent in vertical and rocking vibrations than in horizontal and torisional vibrations. In addition, it is also found that the rigid core ratio is also one of the important factors to affect the dynamic impedance functions if the foundation possesses a rigid core.
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Chung, Ie-Lung, and 鍾瑜隆. "Impedance matrices for circular foundations embedded in a single layer." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/62613477860733609542.

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博士
國立交通大學
土木工程系所
97
A computer program is developed in the thesis for calculating torsional, vertical, horizontal, coupling and rocking impedances in frequency domain for axial-symmetric foundations embedded in layered medium. In this process of formulating the impedances, the soil medium is divided into interior and exterior domains. The analytical solutions are formed separately with unknown coefficients for both domains. In order to find the unknown coefficients for both domains, the variational principle is employed using the continuity conditions (both displacements and stresses) at the interfaces between interior and exterior domains, interior domain and foundation, and exterior domain and foundation to find impedance functions. To solve those problems, the analytic solution for the interior domain is the combination of a homogeneous solution and a particular solution, the exterior domain is described by a homogeneous solution only. To obtain the homogeneous solution, one has to solve the complex root of the transcendental equations. A numerical scheme has been proposed. The wave numbers of transcendental equations have been employed for finding impedance matrices. Some numerical results of torsional, vertical, horizontal, coupling and rocking impedances with different embedded depths will be presented in layered medium and comments on the numerical scheme will be given. The impedance matrices of axial-symmetric foundations embedded in an elastic half-space medium approximated using analytical solutions in layer. To approximate the situation of half-space medium, the thickness of one layer medium gradually increased to see if the impedance function is approaching those for the case of half-space medium. However, as the thickness increases the numerical instability problem will be arisen. To overcome this numerical problem, a new numerical technique will be developed. Some numerical results of torsional, vertical, horizontal, coupling and rocking impedances with different embedded depths will be presented in an elastic half-space medium and comments on the numerical scheme will be given.
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Chung, Rui-Bin, and 鍾瑞濱. "Assessments of reduced vibrations in impedances of stiffened foundations." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/04480821872935577223.

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碩士
中華科技大學
土木防災工程研究所
99
The focus of this research is to perform a three-dimension analysis of soil-structure interaction of the foundations in impedances and vibrations. Solid Pile Method (SOPM) and Simplified Pile Method (SIPM) have been incorporated in the version of SASSI2007, a versatile computer program developed for soil-structure interaction, to verify the validity of this package, particularly in the Simplified Pile Method. The comparison is employed between the field measured data of Southern Taiwan Science Park (STSP) and simulated results on the basis of SASSI2007. Both SOPM and SIPM provided a promising result. SOPM is to utilize solid elements to account for the symmetric and the anti-symmetric modes to the impedance, whereas SIPM is to adopt one individual point to represent the pile element and a rigid link between the pile cap and the pile element. However, these two approaches reveal the similar results. Therefore, SIPM can be considered as an alternative to SOPM to reduce the computation efforts. For the active reduction scheme (stiffened foundation), the effects in this scheme for near and far fields demonstrate that the better the reduced vibration, the shorter the distance, and 20 m of horizontal vibration wave traveling distance is superior to those of 50m.However, the validity of this is disappeared in the vertically vibrated reduction with P wave. For the passive reduction scheme (elastic walls as a buffer), the effects in this scheme for near and far fields demonstrate that the better the reduced vibration, the longer the distance, and 50 m of horizontal vibration wave traveling distance is superior to those of 30m.However, the validity of this is disappeared in the vertically vibrated reduction with P wave if the stiffened foundation scheme is implemented. Nevertheless, without this stiffened scheme on the foundation, the vibrations can be reduced accordingly if distance beyond 50 m, the longer distances, the better results.
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Book chapters on the topic "Impedance of foundation"

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Lin, Gao. "Dynamic Impedance of Foundation on Multi-Layered half-Space." In Seismic Design of Industrial Facilities, 525–46. Wiesbaden: Springer Fachmedien Wiesbaden, 2013. http://dx.doi.org/10.1007/978-3-658-02810-7_44.

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Elzinga, G., and N. Westerhof. "End-Diastolic Volume and Source Impedance of the Heart." In Ciba Foundation Symposium 24 - Physiological Basis of Starling's Law of the Heart, 241–55. Chichester, UK: John Wiley & Sons, Ltd, 2008. http://dx.doi.org/10.1002/9780470720066.ch13.

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Sbartai, Badreddine. "Dynamic Impedance Functions of a Square Foundation Estimated with an Equivalent Linear Approach." In Facing the Challenges in Structural Engineering, 460–70. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61914-9_35.

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Lin, Gao, and Zejun Han. "A 3D Dynamic Impedance of Arbitrary-Shaped Foundation on Anisotropic Multi-Layered Half-space." In Seismic Design of Industrial Facilities, 591–602. Wiesbaden: Springer Fachmedien Wiesbaden, 2013. http://dx.doi.org/10.1007/978-3-658-02810-7_49.

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Gupta, Ashok, and Ramesh Prasad Singh. "Foundation Impedances." In Lecture Notes in Engineering, 93–119. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82899-7_4.

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Owyang, Gilbert H. "Impedance and Mode Transformers." In Foundations for Microwave Circuits, 324–97. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4613-8893-7_7.

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Liingaard, M., L. Andersen, and L. B. Ibsen. "Vertical impedance for stiff and flexible embedded foundations." In Environmental Vibrations: Prediction, Monitoring, Mitigation and Evaluation (ISEV 2005), 255–63. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003209379-39.

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McKinley, Arnold. "Lossy Thin Loops and Rings with Multiple Impedance Loads." In The Analytical Foundations of Loop Antennas and Nano-Scaled Rings, 135–56. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5893-7_7.

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Song, Aiguo, Lizheng Pan, Guozheng Xu, and Huijun Li. "Impedance Identification and Adaptive Control of Rehabilitation Robot for Upper-Limb Passive Training." In Foundations and Applications of Intelligent Systems, 691–710. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37829-4_58.

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McKinley, Arnold. "The Driving Point Impedance and Admittance of Thin, PEC Loops and Rings." In The Analytical Foundations of Loop Antennas and Nano-Scaled Rings, 93–105. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5893-7_4.

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Conference papers on the topic "Impedance of foundation"

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Tabatabaie, Mansour, and Thomas Ballard. "Time-Domain Nonlinear SSI Analysis of Foundation Sliding Using Frequency-Dependent Foundation Impedance Derived From SASSI." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61556.

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Dynamic soil-structure interaction (SSI) analysis of nuclear power plants is often performed in frequency domain using programs such as SASSI [1]. This enables the analyst to properly a) address the effects of wave radiation in an unbounded soil media, b) incorporate strain-compatible soil shear modulus and damping properties and c) specify input motion in the free field using the de-convolution method and/or spatially variable ground motions. For structures that exhibit nonlinearities such as potential base sliding and/or uplift, the frequency-domain procedure is not applicable as it is limited to linear systems. For such problems, it is necessary to solve the problem in the time domain using the direct integration method in programs such as ADINA [2]. The authors recently introduced a sub-structuring technique called distributed parameter foundation impedance (DPFI) model that allows the structure to be partitioned from the total SSI system and analyzed in the time domain while the foundation soil is modeled using the frequency-domain procedure [3]. This procedure has been validated for linear systems. In this paper we have expanded the DPFI model to incorporate nonlinearities at the soil/structure interface by introducing nonlinear shear and normal springs arranged in series between the DPFI and structure model. This combination of the linear far-field impedance (DPFI) plus nonlinear near-field soil springs allows the foundation sliding and/or uplift behavior be analyzed in time domain while maintaining the frequency-dependent stiffness and radiation damping nature of the far-field foundation impedance. To check the accuracy of this procedure, a typical NPP foundation mat supported at the surface of a layered soil system and subjected to harmonic forced vibration was first analyzed in the frequency domain using SASSI to calculate the target linear response and derive a linear, far-field DPFI model. The target linear solution was then used to validate two linear time-domain ADINA models: Model 1 consisting of the mat foundation+DPFI derived from the linear SASSI model and Model 2 consisting of the total SSI system (mat foundation plus a soil block). After linear alignment, the nonlinear springs were added to both ADINA models and re-analyzed in time domain. Model 2 provided the target nonlinear solution while Model 1 provided the results using the DPFI+nonlinear springs. By increasing the amplitude of the vibration load, different levels of foundation sliding were simulated. Good agreement between the results of two models in terms of the displacement response of the mat and cyclic force-displacement behavior of the springs validates the accuracy of the procedure presented herein.
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2

Amendola, Chiara, Filomena de Silva, Dimitrios Pitilakis, and Francesco Silvestri. "ON THE EFFECTIVENESS OF EXPERIMENTALLY-DERIVED FOUNDATION IMPEDANCE FUNCTIONS." In 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research National Technical University of Athens, 2021. http://dx.doi.org/10.7712/120121.8734.18958.

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3

Gassman, Sarah L., and Hongfen Li. "Impedance Logs for Drilled Shafts at the Northwestern NGES." In International Foundation Congress and Equipment Expo 2009. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41021(335)73.

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4

Liu, Bo, Jun Hao, Hongyue Ma, and Hongmei Cui. "Mechanical impedance method and stiffness calculation formula for detecting the foundation pile." In Instruments (ICEMI). IEEE, 2009. http://dx.doi.org/10.1109/icemi.2009.5274881.

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5

Lind Östlund, Johan, Andreas Andersson, Mahir Ülker-Kaustell, and Jean-Marc Battini. "THE EFFECTS OF MODEL ASSUMPTIONS ON THE DYNAMIC IMPEDANCE FUNCTIONS OF A SHALLOW FOUNDATION." In XI International Conference on Structural Dynamics. Athens: EASD, 2020. http://dx.doi.org/10.47964/1120.9235.19373.

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6

Mao, Wei-Min, Shi-Jian Zhu, and Hui-Ming Jiang. "Study on Optimization Design of Hybrid Vibration Isolation System on Flexible Foundation." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84315.

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This article analyzes the process to design hybrid vibration isolation system on flexible foundation. The dynamic model of a hybrid vibration isolation system on flexible foundation is build and the character of power flow transmission is analyzed by sub-system structure impedance synthesis technique and four poles parameter method. The global sensitivity analysis with the Sobol’ method is used to study the global sensitivity behavior of the hybrid vibration isolation system. The multi-objective optimization design method of hybrid vibration isolation system is studied and the mathematic optimization model has been built. Gene algorithm has been used to solve the global optimization problem, and the numerical simulation is carried out.
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7

Holder, D. "Electrical impedance tomography of brain function: its potential advantages for imaging epileptic activity." In IEE Seminar on Electrical Engineering and Epilepsy: A Successful Partnership in conjunction with the Epilepsy Research Foundation. IEE, 1998. http://dx.doi.org/10.1049/ic:19980706.

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8

Ahmed, Riaz, and Kenneth Reifsnider. "Study of Influence of Electrode Geometry on Impedance Spectroscopy." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33209.

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Electrochemical Impedance Spectroscopy (EIS) is a powerful and proven tool for analyzing AC impedance response. A conventional three electrode EIS method was used to perform the investigation in the present study. Saturated potassium chloride solution was used as the electrolyte and three different material rods were used as working electrodes. Different configurations of electrode area were exposed to the electrolyte as an active area to investigate electrode geometry effects. Counter to working electrode distance was also altered while keeping the working electrode effective area constant to explore the AC response dependence on the variation of ion travel distance. Some controlled experiments were done to validate the experimental setup and to provide a control condition for comparison with experimental results. A frequency range of 100 mHz to 1 MHz was used for all experiments. In our analysis, we have found a noteworthy influence of electrode geometry on AC impedance response. For all electrodes, impedance decreases with the increase of effective area of the electrolyte. High frequency impedance is not as dependent on geometry as low frequency response. The observed phase shift angle drops in the high frequency region with increased working electrode area, whereas at low frequency the reverse is true. Resistance and capacitive reactance both decrease with an increase of area, but resistance response is more pronounce than reactance. For lower frequencies, small changes in working area produce very distinctive EIS variations. Electrode material as well as geometry was systematically varied in the present study. From these and other studies, we hope to develop a fundamental foundation for understanding specific changes in local geometry in fuel cell (and other) electrodes as a method of designing local morphology for specific performance.
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9

Esmaeilzadeh, Hamed, Keqin Zheng, Junwei Su, Joey Mead, Margaret J. Sobkowicz, and Hongwei Sun. "Experimental Study of Drag Reduction on Superhydrophobic Surfaces Using Quartz Crystal Microbalance (QCM)." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72314.

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A durable superhydrophobic coating formulation with epoxy binder thermoset was used to coat on surfaces, which provide high quality for corrosion protection, reduced biofouling and improved hydrodynamic behavior. The single and double layers coating of these nanostructured epoxy were fabricated and coated on a novel quartz crystal microbalance (QCM) technique to investigate their hydrophobic properties. Different static and dynamic wettability were obtained and characterized by evaluating the electrical impedance of QCM coated with nanostructured epoxy in air and DI water. It was found that QCM is able to quantitatively characterize the hydrophobicity of these nanostructured polymer surfaces. For double layer coating, the frequency shift in DI water was smaller in comparison to the single layer one. The reduction in mechanical impedance of QCM clearly demonstrates the effect of enhanced hydrophobicity for both single and double layers. The experimental results show that the hydrophobic surface resulted in smaller mechanical impedance loading, while the hydrophilic surface exerted much larger mechanical impedance. The outcome of this research will build a solid foundation for the further improvement of vehicles coated with superhydrophobic surfaces operating in water and increased equipment life.
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10

Costantino, Michael C., Thomas W. Houston, and Andrew S. Maham. "Development of Acceptance Criteria for Soil-Structure Interaction Solutions Using Linear SSI Techniques." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63682.

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Seismic analysis and design of high-hazard nuclear facilities requires evaluation of soil-structure interaction (SSI) effects on structure and soil response due to earthquake ground motions. The industry-wide methodology of computing SSI response of buildings is through linear SSI techniques using the computer code SASSI. Technical issues were identified by users and regulators (Ref. 1) resulting in the U.S. Department of Energy (DOE) commissioning a large scale, multi-year Validation and Verification (V&V) Project for SASSI (Ref. 2). The project was a highly peer reviewed process that included an esteemed Participatory Peer Review Team, DOE oversight, as well as regulatory and stakeholder input. The project goal was to develop benchmark SSI solutions for the range of SSI problems associated with high-hazard facilities within the DOE complex. As per industry software quality control requirements, an acceptance limit for the benchmark solutions must be provided to define the acceptable accuracy of the results produced by SASSI relative to the benchmark. In order to define this limit, variation in the solution of foundation impedance must be related to an expected level of accuracy in structural design quantities of interest (e.g., response spectra, base shear, etc.). Therefore, extensive parametric analyses were performed for coupled soil-structure systems having a broad range of SSI parameters defined by foundation size, soil properties, building stiffness and mass properties, building height, etc. Based on the results of the parametric analyses, ASCE 4 code guidance, and engineering judgment of CJC&A and the peer review team, an acceptable level of accuracy in computed foundation impedance was determined for SASSI solutions. This supported the successful qualification of SASSI for use in two large-scale DOE projects.
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