A. change from compression to tension
B. change from tension to compression
C. always be compression
D. always be tension
Structural Analysis
For stable structures, one of the important properties of flexibility and stiffness matrices is that the elements on the main diagonal________________?
i) of a stiffness matrix must be positive
ii) of a stiffness matrix must be negative
iii) of a flexibility matrix must be positive
iv) of a flexibility matrix must be negative
The correct answer is
A. (i) and (iii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)
In the displacement method of structural analysis, the basic unknowns are__________________?
A. displacements
B. force
C. displacements and forces
D. none of the above
If there are m unknown member forces, r unknown reaction components and j number of joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by__________________?
A. m + r + 2j
B. m – r + 2j
C. m + r – 2j
D. m + r – 3j
The number of independent displacement components at each joint of a rigid-jointed space frame is_______________?
A. 1
B. 2
C. 3
D. 6
The principle of virtual work can be applied to elastic system by considering the virtual work of_________________?
A. internal forces only
B. external forces only
C. internal as well as external forces
D. none of the above
In the slope deflection equations, the deformations are considered to be caused by________________?
i) bending moment
ii) shear force
iii) axial force
The correct answer is
A. only (i)
B. (i)and(ii)
C. (ii) and (iii)
D. (i), (ii) and (iii)
Degree of kinematic indeterminacy of a pin-jointed plane frame is given by______________?
A. 2j – r
B. j – 2r
C. 3j – r
D. 2j + r
Which of the following methods of structural analysis is a force method ?
A. slope deflection method
B. column analogy method
C. moment distribution method
D. none of the above
The three moments equation is applicable only when___________________?
A. the beam is prismatic
B. there is no settlement of supports
C. there is no discontinuity such as hinges within the span
D. the spans are equal
