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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. Under ASCE 7 strength design (LRFD), which load combination most commonly governs gravity design of a typical floor beam carrying dead and occupancy live load?

    Answer: 1.2D + 1.6L + 0.5(Lr or S or R)

    ASCE 7 LRFD uses 1.2D + 1.6L + 0.5(Lr or S or R) as the primary gravity combination for floors with significant live load.

  2. Why does ASCE 7 include the combination 0.9D + 1.0W?

    Answer: To check uplift and overturning where dead load resists the wind

    Reducing dead load to 0.9D gives a conservative check when dead load counteracts wind uplift or overturning.

  3. A hospital with surgery and emergency treatment facilities is assigned to which ASCE 7 Risk Category?

    Answer: Risk Category IV

    Essential facilities such as hospitals with emergency treatment are Risk Category IV.

  4. In Allowable Strength Design (ASD), how is the allowable strength of a member determined?

    Answer: Nominal strength divided by a safety factor Ω

    ASD compares service-level loads with the allowable strength Rn/Ω.

  5. ASCE 7 generally does NOT permit live load reduction for which situation?

    Answer: Places of public assembly

    Assembly occupancies are excluded from live load reduction because the whole area may be fully loaded at once.

  6. What is a common IBC live load deflection limit for floor members?

    Answer: L/360

    IBC Table 1604.3 limits floor member live load deflection to L/360.

  7. In ASCE 7 seismic design, what values does the redundancy factor ρ normally take?

    Answer: 1.0 or 1.3

    ρ is 1.0 for adequately redundant systems and 1.3 when redundancy requirements are not met.