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Posted By: sunil Member Level: Diamond Posted Date: 14 Aug 2008
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2006 Jawaharlal Nehru Technological University Civil Engineering III B.Tech I Semester Supplementary Examinations, November 2006,STRUCTURAL ANALYSIS-I Question paper
Code No: NR310102 NR
III B.Tech I Semester Supplementary Examinations, November 2006
STRUCTURAL ANALYSIS-I
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. Draw the bending moment and shear force diagram of a propped cantilever beam
of span 6 m due to a point load of 6 kN at the mid span. [8+8]
2. Find the fixed end moments for the fixed beam shown in figure2. [16]
Figure 2
3. Four straight wires AO, BO, CO and OD are made of the same material and have
the same cross section. Their upper ends are connected to a horizontal ceiling, the
points A, B, C and D forming a rectangle in which AB = 2m and BC = 2.5m. The
junction O is 3m vertically below a point Q on the ceiling, 1m from AB and 0.75m
from AD. The connections are adjusted so that initially there is no slackness in any
wire and a load of W is then suspended from O. Denoting the pull in the wire AO
as P, find the pull in each of the remaining wires in terms of P and W. Use the
method of tension coefficients. [16]
4. A two span continuous beam of constant moment of inertia is loaded as shown in
Figure4. Find the support moments using Clapeyron’s theorem of three moments.
Also plot BM and SF diagrams for the beam. [10+4+2]
Figure 4
5. Define Strain energy. Derive an expression for Strain energy for a linear elastic
system under shear force. [4+12]
6. A system of wheel loads crosses a girder of 21.60m span, which is simply supported
at its ends. The loads and their distances are as follows.
Wheel load (kN) : 100 100 200 200 150
Distance between
centre (metres) : 1.80 2.70 2.40 2.10
Determine
(a) the maximum B.M at quarter span
(b) the maximum B.M in the girder. [8+8]
7. An over hanging beam DABC , 14m long is supported at A and B . DA=BC=2m;
AB=10m. Draw the influence lines for the reactions at A and B, shear and bending
moment at section 3m from A. Hence obtain their values for a uniformly distributed
load of 10kN/m, 5m long acting from A. [4+4+4+4]
8. A beam of 9m long rests on two supports one at 1.5m from the left hand end and
the other at 3m from the right hand end. The beam carries a u.d.l of 60kN/m over
a length of 6m from the left hand end and a concentrated load of 30kN at the right
hand end. Draw shear force and bending moment diagram. Find the position and
magnitude of maximum bending moment. Also locate the points of contra flexure.
Use graphical procedure. [4+4+4+4]
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