Structural Engineering PE Exam Flashcards
6 cards from real NCEES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Structural Engineering PE Exam flashcards as text
On the NCEES PE Structural exam, what is the 'neutral axis' in a reinforced concrete beam under positive bending?
Answer: The axis where bending stress is zero, separating compression and tension zones
The neutral axis is the theoretical line in the cross-section where bending stress equals zero, with concrete in compression above it and tension steel below it.
In the NCEES PE Structural exam, what does the 'slenderness ratio' KL/r determine for a steel column?
Answer: Whether the column is likely to fail by buckling vs. yielding
The slenderness ratio KL/r governs whether a column behaves as 'short' (yielding controls) or 'long' (elastic buckling controls), determining which design equations apply.
For the NCEES PE Structural exam, what is the purpose of the 'strength reduction factor φ' in ACI 318 design?
Answer: To account for uncertainty in material strengths and construction tolerances
The φ factor reduces nominal strength to design strength, accounting for variability in material properties, dimensions, and construction quality.
On the NCEES PE Structural exam, which condition defines an 'over-reinforced' concrete beam?
Answer: The beam contains more steel than required for balanced failure, causing brittle concrete crushing
An over-reinforced beam has a reinforcement ratio above the balanced value, causing the concrete to crush in compression before the steel yields, resulting in a brittle failure mode.
In NCEES PE Structural exam problems, what does 'composite beam action' achieve in steel-concrete floor systems?
Answer: Allows the concrete slab and steel beam to act together, increasing flexural stiffness and strength
Composite action, achieved through shear studs, forces the concrete slab and steel beam to act as a single unit, dramatically increasing effective section modulus and reducing deflections.
For the NCEES PE Structural exam, what is 'lateral torsional buckling' in a steel beam?
Answer: Out-of-plane buckling where the compression flange displaces laterally and the section twists
Lateral torsional buckling (LTB) is an instability mode where the compression flange of an unbraced beam moves laterally and the section simultaneously twists, reducing moment capacity.
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