# Design of RC Structures Questions and Answers – Limit State of Serviceability

This set of Design of RC Structures Multiple Choice Questions & Answers (MCQs) focuses on “Limit State of Serviceability”.

1. Which of the following is the limiting value of limit state of serviceability for the final deflection?
a) Span/250
b) Span/350
c) Span/450
d) Span/500

Explanation: The limit state of serviceability for the final deflection is due to all loads including effects of temperature, creep and shrinkage. This is measured from the as-cast level of the supports of floors, roofs and all other horizontal members, and should not exceed (Span/250).

2. What is the acceptable value for deflection due to erection of partitions in limit state of serviceability?
a) 40 mm
b) 30 mm
c) 20 mm
d) 10 mm

Explanation: The deflection in limit state of serviceability including the effects of temperature, creep and shrinkage occurring after the erection of partition and the application of finishes should not exceed (Span/350) or 20 mm whichever is less.

3. What is the value for deflection when finishes are applied to prestressed concrete in limit state of serviceability?
a) (Span/250)
b) (Span/300)
c) (Span/450)
d) (Span/500)

Explanation: In limit state of serviceability of deflection, if finishes are to be applied to prestressed concrete members, the total upward deflection should not exceed (Span/300). Exception when it can exceed is when uniformity of camber between adjacent units can be ensured.

4. In limit state of serviceability of deflection, the deflection for type 1 and type 2 members is divided in two parts.
a) True
b) False

Explanation: In limit state of serviceability of deflection the deflection for type 1 and type 2 members is divided in two parts namely:
i. Short-term deflection
ii. Long-term deflection
Both of these deflections can be calculated using elastic analysis.

5. Which of the following loads do not affect the long-term deflection in limit state of serviceability?
a) Prestressing forces

Explanation: The long-term deflection due to the prestressing force, dead load and any sustained imposed load may be calculated using elastic analysis, taking into account the effects of cracking and of creep and shrinkage. Due allowance should be made for the loss of prestress after the period considered.

Sanfoundry Global Education & Learning Series – Design of RC Structures

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