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Posted By: kondapalli Member Level: Gold Posted Date: 01 May 2008
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2007 Jawaharlal Nehru Technological University B.E Civil SOIL DYNAMICS AND MACHINE FOUNDATION (set no1) Question paper
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1. (a) Classify machine foundations according to I.S.Code with neat sketches [8]
(b) Discuss the values of permissible amplitudes suggested by B.I.S for the foun-
dations of different types of machines. [8]
2. (a) Write a critical note on Logarithmic decrement [6]
(b) The exciting force in a constant force amplitude excitation is 120kN. The
natural frequency of the machine foundation is 4Hz. The damping factor is
0.36. Determine the magnification factor and the transmitted force at an
operating frequency of 10 Hz. [10]
3. (a) Discuss Tschebotarioff?s reduced natural frequency. [8]
(b) Describe the factors affecting co-efficient of elastic uniform compression. [8]
4. (a) What are the different methods of vibration isolation [8]
(b) Discuss properties of vibration isolating materials. [8]
5. What are the laboratory methods used to determine the dynamic properties of
soils? Explain them in brief. [16]
6. (a) What is apparent soil mass? Explain how Pauw used this concept to arrive
at the natural frequency of a machine foundation soil system? [10]
(b) What is a bulb of pressure concept? [6]
7. (a) What are the modifications made by Quinlan and Sung to Reissner?s theory?
Explain. [10]
(b) Explain Hsiegn’s equation for vertical vibrations. [6]
8. (a) List the basic differences in analyzing a reciprocating machine foundation by
the two approaches namely [8]
i. Linear weightless spring-mass system, and
ii. Elastic half-space theory.
(b) Derive the expressions of natural frequency and amplitude of a block founda-
tion subjected to vertical vibration.
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