PTU Punjab Technical University B-Tech May 2019 Question Papers 5th Semester Aerospace Engineering
Total No. of Pages : 03
Total No. of Questions : 09
B.Tech.(ANE) (Sem.?5)
AIRCRAFT STRUCTURES-II
Subject Code : ANE-313
M.Code : 60522
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION?A
1. Write briefly :
a) Write statement of energy approach for prediction of buckling of a column.
b) What is dynamic approach for prediction of buckling of a column?
c) Write boundary conditions for a simply supported plate.
d) Explain application of Rayleigh Ritz method for prediction of buckling of a plate.
e) Explain application of Galerkin's method for prediction of buckling of a plate.
f) What do you understand by effective width of a plate?
g) Differentiate between a pure tension field beam and a semi tension field beam.
h) Write stiffness matrix of a single spring of stiffness `k' placed along x axis.
i) What is flexible method used for matrix analysis?
j) What are advantages of finite element method over matrix method of analysis?
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SECTION-B
2.
The pin-jointed column as shown below carries a compressive load P applied eccentrically
at a distance e from the axis of the column. Determine the maximum bending moment in
the column.
y
v
z
e
e
P
P
L
FIG.1
3.
A rectangular plate shown below is compressed by a uniformly distributed load Nx acting
along two opposite ends which are simply supported. Obtain the buckling load of the plate
by Rayleigh-Ritz method.
b
Nx
Nx
a
y
FIG.2
4.
Obtain the buckling load of a curved rectangular plate subjected to uniform compressive
load Nr distributed around the edge of the plate.
5.
Determine the horizontal and vertical components of the deflection of node 2 of the pin-
jointed frame work as shown below. The product AE is constant for all members.
y
3
45?
1
L
2
W
FIG.3
6.
A constant strain triangular element has corners 1(0,0), 2(4,0) and 3 (2,2) referred to a
Cartesian Oxy axes system and is 1 unit thick. Obtain the expressions for displacements `u'
and `v'.
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SECTION-C
7.
Develop stiffness matrix [Kij] for a uniform beam as shown below. The beam has flexural
rigidity EI and length L. It is subjected to nodal forces Fy,i, Fy,j and nodal moments Mi,
Mj in the xy plane.
y
M ,
j i
M ,i i
i
j
x
Fy, j, vj
Fy, j, vj
FIG.4
8.
Consider a column of symmetrical I section as shown below. It is subjected to a
compressive load P all along its flanges and it undergoes torsional buckling. Obtain the
values of critical load and buckling loads due to flexure.
b
t
Y
h
t
X
FIG.5
9.
A diagonal tension field beam is tapered along its lengths as shown below. Calculate the
loads in top and bottom flanges, t and stiffener load P.
W
FT
d
t
F
B
z
FIG.6
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 04 November 2019