AE 1254 – AIRCRAFT STRUCTURES -1 TWO MARK QUESTION & ANSWERS
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AE 1254
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AE 1254
STATICALLY DETERMINATE STRUCTURES
1. Explain with examples the statically determinate structures.
If the structure can be analyzed and the reactions at the support can be determined by
using the equations of static equilibrium such as ™Fx =0, ™)
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1. Explain with examples the statically determinate structures.
If the structure can be analyzed and the reactions at the support can be determined by
using the equations of static equilibrium such as Fx =0, )\ DQG0 WKHQLWLVFDOOHGDVD
statically determinate structure. Example: Simply supported beam, pin jointed truss or frame.
2. Differentiate Truss and Frame?
Truss Frame
Truss is defined as number of members riveted Frame is defined as number of members
together to carry the horizontal, vertical and inclined welded together to carry the horizontal,
loads in equilibrium vertical loads in equilibrium
3What are the types of frames.
Frames are classified into two types.
1. Perfect
2. Imperfect
(i)Deficient frame
(ii) Redundant frame
4. Differentiate the perfect and imperfect frames?
Sl.No. Perfect frame Imperfect frame
1. Perfect frames have sufficient or enough Imperfect frames have less or more members
members to carry the load to carry the load than the required numbers.
2. It satisfies the formula n= 2j-3 It does not satisfy the formula n= 2j-3
Where, n = number of members, j= number of joints.
5. Differentiate the deficient frame and redundant frame?
Sl.No deficient frame redundant frame
1. If the number of members are less than If the number of members are more than the
the required number of members. required number of members
n ‹ 2j-3 n › 2j-3
, 6. Define Plane truss and Space truss? Give some examples.
A Plane truss is a two dimension truss structure composed of number of bars hinged
together to form a rigid framework, all the members are lie in one plane. Eg: Roof truss in
industries
A space truss is a three dimension truss structure composed of number of bars hinged
together to form a rigid framework, the members are lie in different plane. Eg: Transmission line
towers, crane parts.
7. What are the methods used to analyze the plane & space frames?
$QDO\WLFDO method.
1. Method of joints
2. Method of sections (Method of moments)
3. Tension coefficient method.
*UDSKLFDO method.
8. What are the assumptions made in the analyze of a truss?
1. In a frame or truss all the joints will be pin jointed.
2. All the loads will be acting at the joints only.
3.The self-weight of the members of the truss is neglected. Only the live load is
considered
4. The frame is a perfect one.
9. What are conditions of equilibrium used in the method of joints? Why?
The conditions of equilibrium used in the method of joints are, )[ )\ 2QH
of the assumption is all the joints are pin jointed, there is no moment. The equilibrium condition
0[ LVQRWXVHG
10. What is cantilever truss? What is simply supported truss?
If anyone of the member of the truss is fixed and the other end is free, it is called a
cantilever truss. There is no reaction force at the fixed end.
If the members of the truss are supported by simple supports, then it is called simply
supported truss. Reaction forces are at the simply supported ends.
11. What are the hints to be followed while analyzing a cantilever truss using method of joints?
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unknown forces, using the condition of equilibrium )[ DQG)\
$OO the members are assumed to be tensile
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7KHIRUFHFRQYHQWLRQLVXSZDUGIRUFHDVVLJQVSRVLWLYHVLJQDQGGRZQZDUGIRUFH
assigns negative sign.
12.What are the hints to be followed while analyzing a simply supported truss using method of
joints?
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7KHDQDO\VLVLVWREHVWDUWHG from the free end where there is a maximum of two
unknown forces, using the condition of equilibrium )[ DQG)\
$OO the members are assumed to be tensile
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