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Anna University
Department of Civil Engineering
Sixth Semester
CE2351 Structural Analysis - II
(Regulation 2008)
Semester : 6
Department : Civil
Subject Code : CE2351
Subject Name : Structural Analysis - II
Type : 2 Marks with Answers
Edition Details : 2013 Edition (Original Version)
Syllabus Regulation : 2008
Attachment Type : pdf
No. of. Pages : 17
Details : CE2351 Structural Analysis - II - Important 2 marks with answers.
UNIT - I: FLEXIBILITY METHOD FOR INDETERMINATE FRAMES
1. What is meant by indeterminate structures?
Structures that do not satisfy the conditions of equilibrium are called indeterminate structure. These structures cannot be solved by ordinary analysis techniques.
2. What are the conditions of equilibrium?
The three conditions of equilibrium are the sum of horizontal forces, vertical forces and moments at any joint should be equal to zero. i.e. H = 0; V = 0; M = 0
3. Differentiate between determinate and indeterminate structures.
Determinate structures can be solving using conditions of equilibrium alone ( H = 0; V = 0; M = 0). No other conditions are required. Indeterminate structures cannot be solved using conditions of equilibrium because ( H ≠ 0; V ≠ 0; M ≠ 0). Additional conditions are required for solving such structures.
4. Define degree of indeterminacy.
The excess number of reactions that make a structure indeterminate is called degree of
Indeterminacy. Indeterminacy is also called degree of redundancy.
Indeterminacy consists of internal and external indeterminacies.
It is denoted by the symbol ‘i’ Degree of redundancy (i) = I.I. + E.I. Where I.I. = internal indeterminacy and E.I. = external indeterminacy.
5. Define internal and external indeterminacies.
Internal indeterminacy (I.I.) is the excess no of internal forces present in a member that make a
structure indeterminate.
External indeterminacy (E.I.) is excess no of external reactions in the member that make the
structure indeterminate.
Indeterminacy = I.I. + E.I.
E.I. = r – e; where r = no of support reactions and e = equilibrium conditions
I.I. = i – EI e = 3 (plane frames) and e = 6 (space frames)
6. Write the formulae for degree of indeterminacy for:
(a) Two dimensional pinjointed truss (2D Truss)
i = (m+r) – 2j where m = no of members
r = no of reactions; j = no of joints
(b) Two dimensional rigid frames/plane rigid frames (2D Frames)
i = (3m+r) – 3j where m = no of members
r = no of reactions; j = no of joints
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