DEPARTMENT OF CIVIL ENGINEERING
REINFORCED CONCRETE DESIGN
RATIONALE
This subject is an applied engineering subject. Diploma holders in Civil Engineering will be required to supervise RC Construction and fabrication. He may also be required to design simple structural elements, make changes in design depending upon availability of materials (bars of different diameters. This subject thus deals with elementary design principles as per IS:456-2000
LEARNING OUTCOME
After undergoing the subject, students will be able to:
Explain methods of RCC design i.e.
- Working stress methods
- Limit state methods Design singly, doubly reinforced rectangular and T&L beams as per IS Code Design one way and two way slab Design axially loaded column and their isolated footing
DETAILED CONTENTS
1. Introduction (02 hrs)
1.1 Concept of Reinforced Cement Concrete (RCC)
1.2 Reinforcement Materials:
- Suitability of steel as reinforcing material
- Properties of mild steel and HYSD steel
1.3. Loading on structures as per IS: 875
2. Introduction to following methods of RCC design (04 hrs)
2.1 Working stress method: Definition and basic assumptions
2.2 Limit state method: Definition and basic assumptions
3. Shear and Development Length (04 hrs)
Shear as per IS:456-2000 by working stress method
i) Shear strength of concrete without shear reinforcement
ii) Maximum shear stress
iii) Shear reinforcement
4. Concept of Limit State Method (08 hrs)
4.1. Definitions and assumptions made in limit state of collapse (flexure)
4.2. Partial factor of safety for materials
4.3. Partial factor of safetyfor loads
4.4. Design loads
4.5. Stress block, parameters
5. Singly Reinforced beam (10 hrs)
Theory and design of singly reinforced beam by Limit State Method
6. Doubly Reinforced Beams (09 hrs)
Theory and design of simply supported doubly reinforced rectangular beam by Limit State Method
7. Behaviour of T beam, inverted T beam, isolated T beam and ‘L’ beams (No
Numericals) (04 hrs)
8. One Way Slab (10 hrs)
Theory and design of simply supported one way slab including sketches showing reinforcement details (plan and section) by Limit State Method..
9. Two Way Slab (10 hrs)
Theory and design of two-way simply supported slab with corners free to lift, no provisions for torsional reinforcement by Limit State Method including sketches showing reinforcement details (plan and two sections)
10. Axially Loaded Column (10 hrs)
10.1 Definition and classification of columns
10.2. Effective length of column,
10.3. Specifications for longitudinal and lateral reinforcement
10.4. Design of axially loaded square, rectangular and circular short columns by Limit State Method including sketching of reinforcement(sectional elevation and plan)
11. Column Footing (04 hrs)
11.1 Strip footing for walls
11.2 Isolated footing for axially load column with uniform thickness
12. Pre-stressed Concrete (05 hrs)
12.1 Concept of pre-stressed concrete
12.2 Methods of pre-stressing : pre-tensioning and post-tensioning
12.3 Advantages and disadvantages of pre-stressing
12.4 Losses in pre-stress
Important Note: Use of BIS:456-2000 is permitted in the examination.
INSTRUCTIONAL STRATEGY
Teachers are expected to give simple problems for designing various RCC structural members. For creating comprehension of the subject, teachers may prepare tutorial sheets, which may be given to the students for solving. It would be advantageous if students are taken at construction site to show form work for RCC as well as placement of reinforcement in various structural members. Commentary on BIS:456 may be referred along with code for relevant clauses.
RECOMMENDED BOOKS
1. Punmia, BC; "Reinforced Concrete Structure Vol I", Standard Publishers, Delhi
2. Ramamurtham, S; "Design and Testing of Reinforced Structures", Dhanpat
Rai and Sons, Delhi
3. Gambhir, M.L., "Reinforced Concrete Design", Macmillan India Limited
4. Singh, Birinder “RCC Design and Drawing”, Kaption Publishing House, New Delhi
5. Singh Harbhajan “Design of Reinforced Concrete Structures” Abhishek Publishers Ltd., Chandigarh
6. Mallick, SK; and Gupta, AP; "Reinforced Concrete", Oxford and IBH Publishing Co, New Delhi.