EI Structural Analysis & Design 3

Question 1

According to ASCE 7, which load combination governs for a building subjected to dead load (D) and live load (L) using strength design (LRFD)?

Accepted Answer

1.2D + 1.6L

Answer

1.0D + 1.0L

Answer

0.9D + 1.6L

Answer

1.4D + 1.2L

Question 2

The degree of static indeterminacy of a structure is defined as:

Accepted Answer

The number of unknowns minus the number of independent equilibrium equations

Answer

The number of reactions plus the number of members

Answer

The number of members minus twice the number of joints

Answer

The number of supports minus the number of loads

Question 3

In reinforced concrete design, the Whitney stress block depth 'a' used in ACI 318 is related to the neutral axis depth 'c' by:

Accepted Answer

a = β₁ × c

Answer

a = c / β₁

Answer

a = c + β₁

Answer

a = c²/β₁

Question 4

For a steel W-shape beam in AISC LRFD, the design flexural strength is φMn, where φ equals:

Accepted Answer

0.90

Answer

0.75

Answer

0.85

Answer

0.95

Question 5

An influence line for a structure shows how a response quantity (e.g., reaction, shear, or moment) varies as:

Accepted Answer

A unit load moves across the span

Answer

The magnitude of a fixed load increases

Answer

The cross-section properties change along the span

Answer

Temperature varies along the beam

Question 6

The virtual work method (unit load method) for computing beam deflections uses which energy principle?

Accepted Answer

The actual internal work equals the virtual external work when virtual forces are in equilibrium

Answer

The strain energy equals twice the complementary energy

Answer

Deflection equals the integral of the moment divided by EI

Answer

Stiffness times displacement equals applied force

Question 7

Which type of structural connection is designed to transfer moment, shear, and axial force between connected members?

Accepted Answer

Moment (rigid) connection

Answer

Simple (pinned) connection

Answer

Shear tab connection

Answer

Slotted hole connection