Last modified: 2013-05-01
Abstract
The dynamic analysis of a ball mill foundation is a typical problem of soil-structure interaction, and a sub-structure method is used to estimate the structural vibration. In this study a practical case of a ball mill foundation is investigated to illustrate the approach and the dynamic behaviour of the structure. The foundation and piers are modelled by FEM model, and the stiffness and damping of soil (rock) are generated by a computer program DynaN. Finally the stiffness and damping are input to the FEM model as the base boundary condition. A series of dynamic experiments had been done in the field to verify the values of radiation damping which can be generated from the program. Different design options are compared to obtain the better solution. The large mill foundation is an irregular structure and located in a severe seismic zone. The response spectrum analysis is used to determine the earthquake forces and seismic response.
References
[1] Banerjee, P.K. and Sen, R. Dynamic behavior of axially and laterally loaded piles and pile groups. Chapter 3 in Dynamic Behavior of Foundations and Buried Structures, Elsevier App. Sc., London, 95-133, 1987.
[2] Baranov, V.A., On the calculation of excited vibrations of an embedded foundation.
Voprosy Dynamiki Prochnocti, No.14, 195-209, (in Russian), 1967.
[3] Barkan, D.D. Dynamics of bases and foundations. McGraw-Hill Book Co. New York,
1962.
[4] Dobry, R. and Gazetas, G. Simple method for dynamic stiffness and damping of floating
pile groups. Geotechnique, Vol.38, No.4, 557- 574, 1988.
[5] Gazetas, G. and Makris, N. Dynamic pile-soil-pile interaction. I: Analysis of Axial
Vibration. J. Earthq. Eng. and Struct. Dyn. Vol. 20, No.2, 1991.
[6] Han, Y.C. Coupled vibration of embedded foundation,
Journal of Geotechnical Engineering, ASCE, 115(9), 1227-1238, 1989.
[7] Han, Y.C., Study of vibrating foundation considering soil-pile-structure interaction for
practical applications.
J. of Earthquake Engineering and Engineering Vibration, Vol.7, No.3, 321-327, 2008.
[8] Han, Y.C. and Sabin, G. Impedances for radially inhomogeneous soil media with a non- reflective boundary. J. of Engineering Mechanics, ASCE, 121(9), 939-947, 1995.
[9] Han, Y.C. and Novak, M. Dynamic behavior of single piles under strong harmonic
excitation. Canadian Geotechnical Journal, 25(3), 523-534, 1988.
[10] Luco, J.E. Linear soil – structure interaction: A Review. Applied Mech. Div., Vol.53,
ASME, 41-57, 1982.
[11] Roesset, J.M., Stokoe, K.H., Baka, J.E. and Kwok, S.T.Dynamic response of vertical loaded small-scale piles in sand. Proc. 8th European Conf. Earthq. Eng., Lisbon, Vol. 2, 5.6/65-72, 1986.
[12] Wolf, J.P. Soil – structure interaction analysis in time domain. Englewood Cliffs, NJ:
Printice - Hall, 446p, 1988.