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Design Principles Flashcards

7 cards from real ASCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Per ACI 318, what strength reduction factor φ applies to flexure in a tension-controlled reinforced concrete section?

    Answer: 0.90

    Tension-controlled sections are ductile and receive φ = 0.90.

  2. A section is classified as tension-controlled under ACI 318 when the net tensile strain in the extreme tension steel is at least:

    Answer: 0.005

    Net tensile strain εt ≥ 0.005 defines a tension-controlled section.

  3. What is the specified minimum yield strength of ASTM A992 structural steel wide-flange shapes?

    Answer: 50 ksi

    ASTM A992 steel has Fy = 50 ksi and is the standard grade for W-shapes.

  4. What is the theoretical effective length factor K for a column fixed against rotation and translation at both ends?

    Answer: 0.5

    Fixed-fixed end conditions give a theoretical K of 0.5.

  5. How does the Euler critical buckling load of a column change if its effective length is doubled?

    Answer: It drops to one-quarter

    Pcr = π²EI/(KL)², so doubling KL cuts Pcr to one-quarter.

  6. Per ACI 318, the modulus of elasticity of normal-weight concrete is approximately:

    Answer: 57,000√f'c psi

    For normal-weight concrete, Ec ≈ 57,000√f'c in psi.

  7. Per ACI 318, what is the minimum clear cover for cast-in-place concrete cast against and permanently exposed to earth?

    Answer: 3 in.

    Concrete cast directly against earth needs 3 in. of cover to protect the reinforcement.