Structural Systems Flashcards
7 cards from real ASHI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Structural Systems flashcards as text
Which type of lumber defect MOST reduces the structural strength of a floor joist?
Answer: A large knot on the tension face near mid-span
A large knot on the tension face (bottom) at mid-span is the most critical location because that is where bending tension stresses are highest.
What is the primary function of cripple studs in a window or door rough opening?
Answer: To carry loads from above the header to the trimmer studs
Cripple studs above a header carry loads from the structure above down to the header, which then transfers them to the trimmer (jack) studs.
During a home inspection, stair treads deflect noticeably underfoot. What is the MOST likely structural cause?
Answer: Stringers are undersized or poorly attached
Stair stringers are the primary load-carrying members; if undersized or poorly fastened, the entire stair assembly will flex and deflect.
A home inspector sees horizontal cracks in a poured concrete foundation wall. What do they typically indicate?
Answer: Lateral soil or hydrostatic pressure exceeding wall capacity
Horizontal cracks in poured concrete foundation walls are a serious sign of excessive lateral pressure from soil or water pushing against the wall.
What is the role of hurricane ties (rafter ties) in a roof framing system?
Answer: To mechanically fasten rafters to wall top plates resisting uplift
Hurricane ties are metal connectors that anchor rafters to the wall plate, preventing uplift forces from wind from separating the roof structure from the walls.
An inspector observes that a steel I-beam supporting the first floor has visible rust and section loss. Why is this a structural concern?
Answer: Section loss reduces the beam's moment of inertia and load capacity
Section loss from corrosion reduces a steel beam's cross-sectional area and moment of inertia, directly lowering its bending and shear capacity.
Which of the following best describes 'platform framing' as used in modern residential construction?
Answer: A system where each floor level is framed independently on a platform
Platform framing constructs each floor level as a complete platform before the next story's walls are erected, which is standard in modern residential construction.