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Finite Element Analysis of Machine Foundation Resting on End Bearing Piles

التحلیل بطریقة العناصر المحددة لأساس ماكنة مستند الى ركائز ذات تحمل قاعدي

Ibtihal A. M. Al-Nakdy --- Mohammed Y. Fattah --- Mohammed J. Hamood

Engineering and Technology Journal مجلة الهندسة والتكنولوجيا
ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 1 Part (A) Engineering Pages: 132-153
Publisher: University of Technology الجامعة التكنولوجية

Abstract

Dynamic effects of the machines play a major role in sizing of the foundation where conditions, like resonance is avoided by varying the stiffness and the mass of the structure which leads to modifications in foundation sizes. In this paper, a piled machine foundation in sandy soil is analyzed. A detailed 3D finite element analysis approach is considered using finite element software (ANSYS v.11). Machinefoundations resting on end bearing piles are modeled. Harmonic dynamic load is chosen. A parametric study is carried out to investigate the effect of several parameters including: geometry of the piled machine foundation, the amplitude of the dynamic load, and frequency of the dynamic load.It is concluded that as the pile cap thickness increases, the oscillation of displacement decreases due to geometrical damping of the pile cap. There is a limit of pile cap size at which its stiffness governs its dynamic response, above this size, the weight of the cap overrides its stiffness effect, and the additional weight by cap leadsto increase the foundation displacement. On the other hand, when the pile diameter of the group increases, the frequency, at which the maximum displacement occurs increases hence the system becomes more stable against resonance condition.

Keywords

Machine Foundation --- End Bearing Pile --- Pile Cap --- Dynamic --- Finite Elements.