Test on Reinforced Concrete Design: Principles and Elements

Question 1: The study materials provide detailed guidance on calculating the required dimensions and reinforcement for spread, strip, and pad foundations under axial and non-axial loading.

A. Yes

B. No

Explanation: The study materials only list 'Design of foundations: spread, strip, pad, axial and non-axial loading' as a topic within 'EACE 2288 AND EACF 2288 DESIGN OF STRUCTURES I' but do not provide any detailed guidance, principles, or calculation methods for their design.

Question 2: According to the provided study materials, which of the following conditions necessitate an increase in the design tension anchorage length for laps in reinforcement?

A. When the laps are located at the top of a section and the minimum cover is less than 2ϕ.

B. When the clear spacing between adjacent laps is less than 75 mm or 6ϕ.

C. When the design is for compression laps only, requiring a 25 percent increase.

D. When the laps are at corners and the minimum cover to either face is less than 2ϕ.

Explanation: The study materials state that tension laps should be increased by a factor of 1.4 under specific conditions. These include: (a) At the top of a section and with minimum cover < 2ϕ, and (b) At corners where minimum cover to either face < 2ϕ or clear spacing between adjacent laps < 75 mm or 6ϕ. Option 2 is a part of condition (b). Option 3 refers to compression laps, which have a different rule for increase (25% greater than compression anchorage length), not an increase based on tension anchorage length conditions.

Question 3: When a slab is singly reinforced at mid-span, the modification factor for the span-effective depth ratio is based on both tension and compression steel.

A. Yes

B. No

Explanation: The modification factor is based on the area of tension steel in the shorter span when a slab is singly reinforced at mid-span. It is based on both tension and compression steel only if a slab has both top and bottom steel at mid-span (doubly reinforced).

Question 4: Codes of practice specify the minimum area of reinforcement required in a section to resist cracking of the concrete.

A. Yes

B. No

Explanation: To resist cracking of the concrete, codes of practice specify details such as the minimum area of reinforcement required in a section.

Question 5: According to the provided study materials, how are the bending moments in slabs spanning in two directions determined?

A. Using the yield line method or Hilleborg strip method

B. By applying coefficients tabulated in the code of practice

C. Through simplified analysis with a single load case

D. Using the lever-arm curve to determine lever arm (z)

Explanation: The study materials state, "The moments in slabs spanning in two directions can also be determined using coefficients tabulated in the code of practice."