Structural Analysis - Study Mode
[#36] The degree of static indeterminacy of a pin-jointed space frame is given by (where m is number of unknown member forces, r is unknown reaction components and j is number of joints)
Correct Answer
(B) m + r - 3j
[#37] The degree of static indeterminacy up to which column analogy method can be used is
Correct Answer
(B) 3
[#38] When a load crosses a through type Pratt truss in the direction left to right, the nature of force in any diagonal member in the left half of the span would
Correct Answer
(A) Change from compression to tension
[#39] Pick up the incorrect statement from the following:
Correct Answer
(D) None of these
Explanation
Solution: All the given statements are correct definitions related to the gross sectional area of webs in different structural members . Option A: The gross section of the web of rolled I-beams is accurately calculated as the depth of the beam multiplied by the web thickness. Option B: For channel sections, the gross area of the web is indeed obtained by multiplying the depth of the web by its thickness. Option C: In the case of plate girders, the gross section of the web is correctly given by the product of the web plate depth and its thickness. Since none of the given statements are incorrect, the correct answer is Option D: None of these .
[#40] The number of independent equations to be satisfied for static equilibrium in a space structure is
Correct Answer
(D) 6