Structural Systems and Technology Flashcards

Which factor most directly determines the seismic design category of a building in the US?

Answer: Occupancy category and site seismic hazard level

Seismic Design Category is assigned based on the building's Risk Category combined with the mapped spectral acceleration values for the site.

What does the term 'tributary area' mean in structural load calculations?

Answer: The portion of floor or roof area that contributes load to a specific member

Tributary area is the loaded region assigned to a structural member for the purpose of calculating the loads it must support.

A two-way flat plate slab differs from a flat slab because it lacks:

Answer: Drop panels and column capitals

A flat slab has drop panels and/or column capitals to resist punching shear, while a flat plate does not.

Which structural material has equal strength in both tension and compression?

Answer: Structural steel

Structural steel exhibits nearly identical yield strength under tensile and compressive stresses, making it efficient for both conditions.

In wind load design, the 'pressure coefficient' accounts for:

Answer: Shape and geometry effects on wind pressure distribution

Pressure coefficients adjust the basic wind pressure to reflect how a building's shape concentrates or reduces pressure on specific surfaces.

What is the purpose of expansion joints in large concrete structures?

Answer: To allow for thermal expansion and contraction without cracking

Expansion joints provide deliberate gaps that accommodate dimensional changes due to temperature fluctuations, preventing uncontrolled cracking.