Dynamic Behavior of Machine Foundations on layered sandy soil under Seismic Loadings
محتوى المقالة الرئيسي
الملخص
In this paper, a dynamic investigation is done for strip, rectangular and square machine foundation at the top surface of two-layer dry sand with various states (i.e., loose on medium sand and dense on medium sand). The dynamic investigation is performed numerically using finite element programming, PLAXIS 3D. The soil is expected as a versatile totally plastic material that complies with the Mohr-Coulomb yield criterion. A harmonic load is applied at the base with an amplitude of 6 kPa at a frequency of (2 and 6) Hz, and seismic is applied with acceleration – time input of earthquake hit Halabjah city north of Iraq. A parametric study is done to evaluate the influence of changing L/B ratio (Length=12,6,3 m and width=3 m), type of sand, and frequency of the machine for soil with two layers (dense and medium sand) and (loose and medium sand). It was noticed that the displacement decreases when the foundation is strip, and has the highest values when the foundation is square. At the same time, the maximum vertical stress of the foundation (L/B = 4 and L/B = 1) appears to be (1262) kPa and (1255) kPa, respectively, due to increasing the foundation mass as a result of increasing its dimensions. Then again, the displacement increases by 20% for vertical displacement when decreasing the relative density. In addition, it has been noticed that there is a decrease in displacement when the frequency value changes from (2 to 6) Hz.
تفاصيل المقالة
القسم
كيفية الاقتباس
المراجع
Abdul-Kaream, K. W., 2020. Effect of Uncertainties of Soil Shear Strength Parameters on the Reliability of Machine Foundations, Ph.D. Thesis, Building and Construction Engineering Department, University of Technology, Iraq.
Abd Al-Kaream, K. W., 2013. The dynamic behavior of machine foundation on saturated sand, M. Sc. Thesis, Building and Construction Engineering Department, University of Technology, Iraq.
Al-Ameri, A. F. I., 2014. Transient and Steady State Response Analysis of Soil Foundation System Acted upon by Vibration, Ph.D. Thesis, Civil Engineering Department, University of Baghdad, Iraq.
Al-Hasso, N. K. I., 2020. Analysis and Design of machine foundation Using Analytical and Numerical Methods, M.Sc. Thesis, Civil Engineering Department, University of Mosul, Iraq.
Al-Helo, H. K., 2015. Dynamic Behavior of Machine Foundation on Two-Layer Soil System, In Journal of Engineering and Development, Vol. 19, Issue 1.
Al-Taie, A. J., and Albusoda, B. S., 2019. Earthquake Hazard on Iraqi Soil Halabjah Earthquake as a Case Study, Geodesy and Geodynamics, 10(3), 196–204.
Al-Azawi, T. K., Al-Azawi, R. K., and Al-Jaberi, Z. K., 2006. Stiffness and Damping Properties of Embedded Machine Foundations, Journal of Engineering, 12(2).
Boumekik, A., Belhadj-Mostefa, S., and Meribout, F., 2010. Experimental Analysis of the Dynamic Stress Distribution at the Soil Foundation Interface, Asian Journal of Civil Engineering (Building and Housing), 11, No. (5), pp 575-583.
Chandrakaran, S., Vijayan, P. and Ganesan, N., 2007. A Simplified Procedure for Design of Machine Foundations Subjected to Vertical Vibrations, Journal of the Institution of Engineers, India, Civil Engineering Division, 88, No. (5), pp. 3-12.
Fattah, M. Y., Al-Neami, M. A., and Jajjawi, N. H., 2014. Prediction of Liquefaction Potential and Pore Water Pressure Beneath Machine Foundations, Central European Journal of Engineering, 4(3), 226–249.
Fattah, M. Y., Salim, N. M., and Al-Shammary, W. T., 2015. Effect of Embedment Depth on Response of Machine Foundation on Saturated Sand, Arabian Journal for Science and Engineering, 40(11), 3075–3098.
Fattah, M. Y., Al-Mufty, A. A., and Al-Badri, H. T., 2007. Design Charts For Machine Foundations, Journal Of Engineering, 13(4).
Mitchell, J. K., and Soga, K., 2005. Fundamentals of Soil Behavior”, Vol. 3, John Wiley and Sons New York.
Nagaraj, T. K., and Ullagaddi, P. B., 2010. Experimental study on load settlement behavior of sand foundations, Indian Geotechnical Conference 2010, GEO Trendz December, 16–18.
Piyush, K. B., and Ayan, S., 2014. Dynamic Analysis of Machine Foundation, Assistant Professor, Dept of Civil Eng., PDVVP COE, Ahmednagar, Maharashtra, India.
PLAXIS 3D Manual (2020), Delft University of Technology & PLAXIS bv, Netherland.
Srinivasulu, P., and Vaidyanathan, G. V., 1990. Machine foundations, McGraw-Hill Publishing Company Limited.
Tutunchian, M. A., Shahnazari, H., Salehzadeh, H., and Asadi, M., 2011. Study on Dynamic Behavior of Shallow Foundations on Liquefiable Sand Using Video Processing Technique, Electronic Journal of Geotechnical Engineering, 16, 945–960.