Civil Engineering
Structures, surveying, soil mechanics
Showing 21–24 of 24 questions
In Williot-Mohr diagram for a truss, what do the lines represent?
Correct Answer:
B. Deflected position of joints
EXPLANATION
Williot-Mohr diagram graphically represents the deflected shape showing displaced position of all joints in a truss.
The Castigliano's first theorem relates:
Correct Answer:
C. Partial derivative of strain energy to load equals deflection
EXPLANATION
Castigliano's first theorem: ∂U/∂P = δ, where U is strain energy and δ is deflection at point of load P.
A frame with 'j' joints, 'm' members, and 'r' reaction components is indeterminate with degree:
Correct Answer:
A. DI = m + r - 2j
EXPLANATION
For planar frames: DI = (m + r) - 2j, where 2j accounts for 2 equilibrium equations per joint in 2D.
In matrix method of structural analysis, the stiffness matrix [K] is:
Correct Answer:
C. Symmetric and positive definite for stable structures
EXPLANATION
Stiffness matrix [K] is symmetric (reciprocal theorem) and positive definite for stable structures without rigid body movements.