CE6505 DRE 2marks 16marks, DESIGN OF REINFORCED CONCRETE ELEMENTS Question Bank, DRE Short Answers – CIVIL 5th SEM Anna University

UNIT – I
METHODS OF DESIGN OF CONCRETE STRUCTURES QUESTIONS & ANSWERS
PART – A

1. What is Ultimate Limit State (ULS)
ULS in concerned with the maximum load – carrying capacity of thestructure within the limits of strength of the materials used.
2. What is characteristic load?
Generally, load on any structural members cannot be determined accurately. For most
structures, it is uneconomical to design using anticipated maximum load.Therefore, in normal design practice, the load to be used is based on thecharacteristic load. Characteristicloadisdefinedastheminimumloadthatstatistically will not exceed during the design life of the structure.
3. State the 3 types of load.
a) Dead load b) Imposed loadc) Wind load
4. State four objectives of the design of reinforced concrete structure.
Properly designed reinforced concrete structures should:

•  Have acceptable probability of performing satisfactorily during their intended life,
•  Sustain all loads with limited deformations during construction and use,
•  Be durable,
•  Adequately resist the effects of misuse and fire.

6. What are the three methods of design of reinforced concrete structural elements?
The three methods are:

•  Limit state method,
•  Working stress method,
•  Method based on experimental approach

7. How to estimate the design loads in (i) limit state method, and (ii) working stress method?
(i) In limit state method,
Design loads = Characteristic loads multiplied by the partial safety factor for loads
(ii) In working stress method,
Design loads = Characteristic loads.