Numerical Analysis of the Interference of Two Active Machine Foundations
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ORIGINAL PAPER
Numerical Analysis of the Interference of Two Active Machine Foundations Saif Alzabeebee
Received: 29 April 2019 / Accepted: 7 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract This study examines the influence of the interference on the dynamic response of two active machine foundations using the finite element analysis. The finite element model has been built carefully to ensure that the finite element model extend, and the mesh size do not influence the obtained results. Furthermore, the methodology of the finite element analysis has been verified using well-known and robust analytical solutions of wave propagation and machine vibration. Loose sand, medium sand, and dense sand and a vibration frequency range of 0.5–20.0 Hz have been considered in the analyses. The results showed that the interference of two active machine foundations remarkably increases the dynamic settlement with a percentage increase range from 1 to 77%. This percentage increase declines as the frequency of vibration or the distance between the foundations increases and rises as the soil stiffness increases. It was also found that the critical distance after which the interference effect terminates depends on the frequency of vibration and the stiffness of the soil, where the critical distance increases as the frequency of vibration declines or as the stiffness of the soil increases. Finally, a methodology has been proposed based on the results of the analyses to
S. Alzabeebee (&) College of Engineering, University of Al-Qadisiyah, Al-Qadisiyah, Iraq e-mail: [email protected]; [email protected]
implicate the effect of interference in the calculation of the dynamic settlement. Keywords Machine foundation Interference effect Finite element analysis Dynamic settlement
1 Introduction Foundations of machines are one of the crucial elements in industrial structures (for example power plants and petrochemical complexes) (Fattah et al. 2017a). The design criteria of machine foundations are based on limiting the dynamic settlement to less than 1 mm based on the frequency of vibration (Srinivasulu and Vaidyanathan 2007); this restricted settlement has been set to enable a satisfactorily operation of these machines (Ali et al. 2017). The soil supporting machine foundations is subjected to abnormal harmonic and periodic vibrations (Swain and Ghosh 2016; Fattah et al. 2017b). The behaviour of the soil and the foundation under such vibrations are very complicated and different from the well-known and understood behaviour under static loads. Thus and because of the loading complexity, this subject has constantly received attention from researchers to understand the effect of these dynamic loads induced due to machines vibration on the behaviour of the foundations using laboratory-based studies (Al-
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Geotech Geol Eng
Homoud, and Al-Maaitah 1996; Al-Wakel et al. 2015; Fattah et al. 2016, 2017a, b, 2018), field-based studies (Swain and Ghosh 2016), and numerica
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