Jawaharlal Nehru Technological University Hyderabad 2007 B.E Civil Engineering SOIL DYNAMICS AND MACHINE FOUNDATION - Question Paper

1. (a) Classify machine foundations according to I.S.Code with neat sketches [8]
(b) explain the values of permissible amplitudes suggested by B.I.S for the foun-
dations of various kinds of machines. [8]
2. Starting from fundamentals, find the equations of motion for over damped, crit-
ically damped and under damped systems. [16]
3. (a) Out line Barken?s method for finding natural frequency. [6]
(b) A machine weighing 100kg is supported directly on springs having a stiffness of
200kg/m. The unbalanced rotating mass outcomes in a disturbing force of 20kg
at a speed of 3000r.p.m. The damping factor is 0.1. Determine the amplitude
of vibration and the force transmitted to the foundation. [10]
4. (a) elaborate the various methods of vibration isolation [8]
(b) explain properties of vibration isolating materials. [8]
5. (a) Write the generalized wave formula find expression for compression and
shear waves. [8]
(b) The subsequent data was found in a cyclic plate load test, using a plate of
size 0.3m × 0.3m
Load intensity (kN/m2) Settlement (mm)
25 0.5
0 0.4
50 0.95
0 0.8
75 1.6
0 1.25
100 2.5
0 1.9
150 3.6
0 2.6
Plot the necessary graph and determine the values of CuCandC for a base
of 10 sq.m. [8]
6. (a) Elucidate briefly Pauw’s analogy of foundation soil system. [8]
(b) Explain: [8]
1 of 2
Code No: RR410105 Set No. 2
i. Viscous damping and
ii. Logarithmic decrement.
7. (a) How do you analyse a block foundation based on elastic half-space theory? [8]
(b) discuss Quinlan and Sung’s changes. [8]
8. (a) elaborate the factors to be considered in the design of block foundations for
reciprocating foundation? [8]
(b) Draw the models for analysis of impact kind machines, according to I.S.code.
elaborate their limitations?

Earning:   Approval pending.