Annamalai University 2014 December Question Paper B.Sc.Construction Management : Strength of Materials

Annamalai University 2014 december question paper
B.Sc. DEGREE EXAMINATION December 2014
(CONSTRUCTION MANAGEMENT)
(THIRD SEMESTER)
320: STRENGTH OF MATERIALS-I
Time: Three hours Maximum: 75 marks
 Answer ONE FULL question from each UNIT (5 × 15 = 75)
UNIT-I
1. a) Define young’s modulus. (3)
 b) A steel rod 25mm in diameter and 2m long is subjected to an axial pull
of 50kN. Find (i) the intensity of stress (ii) Elongation. Take
E=2×105N/mm2
(12)
(OR)
2. a) State Hook’s law and Elastic limit. (3)
 b) A square R.C.C column 300mm size is reinforced with 4 nos of 25mm
diameter bars. The permissible compressive stress in concrete is
5N/mm2 modular ratio of steel and concrete is 13.3. Determine the
maximum allowable load on the column.
(12)
UNIT-II
3. a) Define radius of gyration. (3)
 b) Find the moment of inertia for a channel section 300mm × 150mm
× 20mm about it centroidal axis.
(12)
(OR)
4. a) State parallel axis theorem. (3)
 b) Find the Ixx and Iyy for a given I section, also determine the section
modulus and radius of gyration about the centroidal axis.
(12)
2
UNIT-III
5. a) What are the different types of loads? (3)
 b) Draw the SFD and BMD for the beam shown in figure: (12)
(OR)
6. a) What is shear stress? (3)
 b) Draw the SFD and BMD for the beam show in fig. (12)
UNIT-IV
7. a) What are the assumptions made in theory of simple bending? (5)
 b) A simply supported beam 5m long carries an UdL of 20kN/m if the
bending stress is not exceed 12N/mm2. Determine the depth of
rectangular section. Take b=200mm.
(10)
(OR)
8. a) What is the relation between slope, deflection and radius of curvature
of a simply supported beam?
(5)
 b) A simply supported beam AB of span 5 meters is carrying a point load
of 30kN at a distance 3.75m from the left end A. Calculate the slopes at
A and B and deflection under the load. Take EI=26×1012N.mm2(Use
moment area method)
(10)
UNIT-V
9. a) What is circumferential stress? (3)
 b) A spherical shell of 2m diameter is made up of 10mm thick plates.
Calculate the change in diameter and volume of the shell, when it is
subjected to an internal pressure of 1.6Mpa. Take E=200Gpa and
1/m=0.3
(12)
(OR)
10. a) What is difference between a thin cylindrical shell and a thick
cylindrical shell?
(3)
 b) A compound cylinder is made by shrinking a tube of 160mm internal
diameter and 20mm thick over another tube of 160mm external
diameter and 20mm thick. The radial pressure at the common surface,
after shrinking is 8N/mm2. Find the final stresses setup across the
section, when the compound cylinder is subjected to an internal fluid
pressure of 60N/mm2
(12)
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5570

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