BCE Reinforced Concrete Design 2

Question 1

In ACI 318, the development length (ld) for a straight deformed bar in tension depends primarily on which factors?

Accepted Answer

Bar diameter, concrete strength, steel yield strength, cover, and spacing

Answer

Development length depends on bar diameter, fy, f'c, concrete cover, bar spacing, transverse reinforcement, coating, and location (top vs. bottom bars).

Question 2

Two-way flat plate slabs transfer shear directly to columns through which failure mechanism?

Accepted Answer

Punching shear around the column perimeter

Answer

Flat plates are susceptible to punching shear failure where the slab 'punches' through along a truncated cone or pyramid around the column.

Question 3

The effective depth 'd' in a reinforced concrete beam is defined as:

Accepted Answer

The distance from the compression face to the centroid of tension reinforcement

Answer

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.

Question 4

What is the purpose of temperature and shrinkage reinforcement in a one-way slab?

Accepted Answer

To control cracking perpendicular to the span direction due to temperature changes and concrete shrinkage

Answer

Temperature and shrinkage steel is placed perpendicular to the main flexural reinforcement to control cracking caused by concrete shrinkage and temperature variations.

Question 5

In the design of reinforced concrete columns, a column is classified as 'short' when:

Accepted Answer

Slenderness effects can be neglected (klu/r ≤ 22 for braced frames)

Answer

A column is short (non-slender) when the slenderness ratio klu/r ≤ 22 for braced frames, meaning second-order (P-delta) effects are negligible.

BCE - Bachelor of Civil Engineering Practice Test

BCE - Bachelor of Civil Engineering Practice Test

BCE Reinforced Concrete Design 2