NCEES Structural Engineering PE Exam 1 — Questions and Answers
Question 1: According to NCEES PE Structural exam standards, which load combination from ASCE 7 governs strength design for a building subjected to dead, live, and wind loads?
- 1.2D + 1.6L
- 1.2D + 1.0W + 1.0L (Correct answer)
- 0.9D + 1.0W
- 1.4D
Correct answer: 1.2D + 1.0W + 1.0L
ASCE 7 load combination 1.2D + 1.0W + 1.0L (or +0.5S) governs when wind load is a primary variable action alongside dead and live loads.
Question 2: In the NCEES PE Structural exam, what is the purpose of a moment frame in a building's lateral force-resisting system?
- To transfer gravity loads to foundations
- To resist lateral forces through bending in beams and columns (Correct answer)
- To isolate floor vibrations
- To distribute vertical loads uniformly
Correct answer: To resist lateral forces through bending in beams and columns
A moment frame resists lateral (wind or seismic) forces through flexural rigidity developed by moment connections between beams and columns.
Question 3: For the NCEES PE Structural exam, what does the term 'effective length factor K' represent in column design?
- The ratio of actual column length to cross-section radius
- A modifier that accounts for end conditions affecting buckling length (Correct answer)
- The factor of safety against yielding
- The ratio of live load to dead load
Correct answer: A modifier that accounts for end conditions affecting buckling length
The effective length factor K adjusts the actual column length to an equivalent pin-ended length based on end restraint conditions for Euler buckling calculations.
Question 4: On the NCEES PE Structural exam, which failure mode governs the design of a short, stocky concrete column?
- Euler buckling
- Material crushing/yielding (Correct answer)
- Lateral torsional buckling
- Web crippling
Correct answer: Material crushing/yielding
Short columns fail by material crushing (concrete compression or steel yielding) rather than elastic buckling, which governs slender columns.
Question 5: In NCEES PE Structural exam context, what is the significance of the 'plastic moment' Mp in steel beam design?
- The moment at which elastic behavior begins
- The maximum moment capacity when the full cross-section yields (Correct answer)
- The moment at which shear controls
- The moment due to plastic deformation from impact loads
Correct answer: The maximum moment capacity when the full cross-section yields
The plastic moment Mp represents the theoretical maximum bending capacity achieved when the entire cross-section has yielded, forming a plastic hinge.
Question 6: For the NCEES PE Structural exam, what does 'shear lag' affect in connection design of steel members?
- The weld cooling rate
- The effective area of a member when not all elements are connected (Correct answer)
- The time delay in load transfer
- The creep in concrete shear walls
Correct answer: The effective area of a member when not all elements are connected
Shear lag reduces the effective net area of a tension member when not all cross-sectional elements are directly connected, accounted for by the shear lag factor U.
NCEES Structural Engineering PE Exam 1
According to NCEES PE Structural exam standards, which load combination from ASCE 7 governs strength design for a building subjected to dead, live, and wind loads?