SCE Structural Engineering 3

Question 1

Which method is used to analyze indeterminate structures by assuming member end moments as unknowns and satisfying joint equilibrium?

Accepted Answer

Moment distribution method

Answer

The moment distribution method (Hardy Cross method) iteratively distributes unbalanced moments at joints until equilibrium is achieved at every joint.

Question 2

For a rectangular reinforced concrete section under pure bending, the depth of the equivalent rectangular stress block 'a' is related to the neutral axis depth 'c' by:

Accepted Answer

a = β₁ × c

Answer

ACI 318 uses a rectangular stress block approximation where the block depth a = β₁c, with β₁ typically 0.85 for f'c ≤ 28 MPa.

Question 3

In a two-hinged arch under a uniformly distributed load, the horizontal thrust H at the supports depends primarily on:

Accepted Answer

The span length, rise, and load magnitude

Answer

The horizontal thrust in a two-hinged arch is a function of the applied load, span, and rise; larger span or lower rise increases the thrust for the same load.

Question 4

Which of the following best describes 'lateral-torsional buckling' in steel beams?

Accepted Answer

Out-of-plane deflection combined with twisting of the compression flange

Answer

Lateral-torsional buckling involves the beam deflecting laterally out of its original plane while simultaneously twisting, typically occurring in the compression flange region.

Question 5

The modular ratio (n) in reinforced concrete design is defined as:

Accepted Answer

Ratio of modulus of elasticity of steel to that of concrete (Es/Ec)

Answer

The modular ratio n = Es/Ec allows transformed-section analysis by converting steel area into an equivalent concrete area for elastic stress calculations.

SCE Engineering Practice Test

SCE Engineering Practice Test

SCE Structural Engineering 3