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Wednesday, March 22, 2017




Roll No­­­­­­­­­_________

STRUCTURAL MECHANICS
5th Exam /Civil/5162/May’05
                                                             
Duration 3 Hrs.
Section –A
Note : attempt any ten questions.
1.      
a.     Define the terms: Young’s Modulus of rigidity.
b.     Differentiate between lateral strain and longitudinal strin.
c.      What do you mean by factor of safety ? explain.
d.     Draw B.M.D for a simply supported beam carrying  uniformly  distributed load in whole span.
e.      What do you mean by point of contra flexure.
f.       In a simply supported beam where will the bending moment be maximum and why?
g.     What do you mean by section modulus? What is its value for a rectangular section of width b and depth d?
h.     Explain briefly ‘Theorem of parallel Axis’
i.       Write the formula for maximum defection of a simply supported beam carrying U.D.C on whole span. Where it occurs.
j.       Define periect, important and redundant frames with neat sketches.
k.     Euler’s formula for load carried by a column is applicable for long or short column. Write this formula.
l.       What do you mean by eccentricity. Explain with a sketch.


Section-B


Note : Attempt any three questions
2.      
a.     A steel rod of 30 mm diameter and 5 m long is connected to two grips and the rod is maintained at a temperature of 95 C determine the stress and full exerted when the temperature falls to 30 C , if
                                                             i.      The ends do not yield and
                                                           ii.      The ends yields by 1.2mm. take E = 2x106  N/mm α=12x106˚C

b.     A solid round bar 4 m long and 5 cm in dia was found to extend 4.6 mm under a tensile load of 50 KN this bar is used as a strut with both ends hinged. Determine the buckling load for the bar and also the safe load taking F 0.5 as 4.0.

c.      A short column of rectangular x-section 80 mm by 60 mm caries a load of 40 KN at a point 20 mm form the longer side and 35 mm from the shorter side. Determine the maximum compressive  and tensile stresses in the section.


d.     a simply supported beam of length 10 m carries two point loads of 50 KN and 40 KN at distance 2 m and 6 m from the left end. It also carries a U.D.C of  10KN/m between the point loads. Draw S.F.D and B.M.D for the beam. Also calculate the maximum bending moment.  

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