Reinforced Concrete Design Flashcards
6 cards from real BCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Reinforced Concrete Design flashcards as text
In ACI 318, the development length (ld) for a straight deformed bar in tension depends primarily on which factors?
Answer: Bar diameter, concrete strength, steel yield strength, cover, and spacing
Development length depends on bar diameter, fy, f'c, concrete cover, bar spacing, transverse reinforcement, coating, and location (top vs. bottom bars).
Two-way flat plate slabs transfer shear directly to columns through which failure mechanism?
Answer: Punching shear around the column perimeter
Flat plates are susceptible to punching shear failure where the slab 'punches' through along a truncated cone or pyramid around the column.
The effective depth 'd' in a reinforced concrete beam is defined as:
Answer: The distance from the compression face to the centroid of tension reinforcement
The effective depth d is the distance from the extreme compression fiber to the centroid of the tension reinforcement, which is the lever arm for internal couple calculations.
What is the purpose of temperature and shrinkage reinforcement in a one-way slab?
Answer: To control cracking perpendicular to the span direction due to temperature changes and concrete shrinkage
Temperature and shrinkage steel is placed perpendicular to the main flexural reinforcement to control cracking caused by concrete shrinkage and temperature variations.
In the design of reinforced concrete columns, a column is classified as 'short' when:
Answer: Slenderness effects can be neglected (klu/r ≤ 22 for braced frames)
A column is short (non-slender) when the slenderness ratio klu/r ≤ 22 for braced frames, meaning second-order (P-delta) effects are negligible.
Which reinforcement configuration provides the most ductility in a tied reinforced concrete column?
Answer: Closely spaced spiral reinforcement
Spiral columns provide significantly greater ductility than tied columns because the continuous spiral confines the concrete core, maintaining load-carrying capacity after the shell spalls.