RCC Introduction

1. UCE 1503
REINFORCED CEMENT
CONCRETE DESIGN
UNIT - I (Part-1)
- INTRODUCTION
12-08-2022 1
Compiled by Dr Y.K.Sabapathy, Prof.,Civil
Engg. Dept., SSNCE

2. SYLLABUS - UNIT-1
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Engg. Dept., SSNCE
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3. TOPICS
UNIT I - INTRODUCTION (9 + 6 =15 Hrs)
1)Objective of structural design.
2)Steps in RCC Structural Design Process.
3)Type of Loads on Structures and Load combinations.
4)Code of practices and Specifications.
5)Concept of Working Stress Method, Ultimate Load
Design and Limit State Design Methods for RCC.
12-08-2022
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Engg. Dept., SSNCE
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4. TOPICS…..
UNIT I - INTRODUCTION
6) Properties of Concrete and Reinforcing Steel
7)Analysis and Design of Singly reinforced
Rectangular beams by working stress method.
8)Limit State philosophy as detailed in IS code .
9)Advantages of Limit State Method over other
methods.
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Engg. Dept., SSNCE
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5. OBJECTIVE OF THIS COURSE
DESIGN OF RC ELEMENTS
 This course covers the different types of philosophies
related to Design of Reinforced Concrete Structures
with emphasis on Limit State Method.
 The design of basic elements such as slab, beam,
column and footing which form part of any structural
system with reference to Indian standard code of
practice for Reinforced Concrete Structures and
Design Aids are included.
 At the end of course the student shall be in a position
to design the basic elements of reinforced concrete
structures.
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Engg. Dept., SSNCE
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6. Objective of structural design
The main objectives of structural design is to design a
structure for its :
1. Safety,
2. Serviceability,
3. Durability &
4. Economy.
A structure can be a building, bridge, dam, tunnel,
shipping berth structure, airport runway etc…..
12-08-2022
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Engg. Dept., SSNCE
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7. Steps in RCC Structural Design Process
Step 1: Prepare the drawings for a structure to be
designed ( Plan, Elevation and Section ). [In most cases
the architect will give these drawings]
Step 2: Suitably assume the dimensions of the structural
members and also know the structure’s boundary
conditions.
Step 3: Analyse the structure / structural elements
based on the forces acting on it.
Step 4: Based on the above analysis, the structural
elements such as beams, columns, slabs, etc… are
designed individually.
Step 5: After designing the structural elements they are
checked for its safety.
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Engg. Dept., SSNCE
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8. Steps in RCC Structural Design Process
Step 6: If the elements does not pass the checks (such as
deflection, crack width etc….) , then the elements are
once again revised in its design by altering the
dimensions and sometimes by altering the amount of
reinforcements (if necessary). This process of iteration is
repeated till the elements satisfy the all the necessary
checks.
Step 7: once the checks are completed, then the design
is said to be good enough for execution of the work.
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Engg. Dept., SSNCE
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9. WHAT DO YOU MEAN BY DESIGN?
AND
WHY SHOULD WE DESIGN?
Design in engineering is a process by which any
load bearing member is finally given a shape
along with its dimension.
In RCC design, the dimensions of the structural members
along with amount of reinforcement (i.e. dia., numbers
and position) are finally obtained
In engineering we mainly design because a load
bearing member/structure should be first safe
while in use and it should be economical while
making it and also during its life time.
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10. Type of Loads
on Structures
and
Load combinations
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Engg. Dept., SSNCE
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11. Types of loads
Before designing any structure or the
different elements such as beams and
columns etc…, one has to first determine the
various natural and man-made loads acting
on them (see Fig. next slide).
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Engg. Dept., SSNCE
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12. Types of loads
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Engg. Dept., SSNCE
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13. TYPES OF LOADS
The various loads expected on a structure may be classified
into the following groups:
(i) Dead loads ( DL)
(ii) Imposed loads/ Live Load ( LL )
(iii) Wind loads
(iv) Snow loads
(v) Earthquake forces
(vi) Shrinkage, creep and temperature effects, and
(vii) Other forces ( such as impact load, blast load, soil
pressure, surface water pressure etc…) and their effects.
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14. LOAD COMBINATIONS
For a good design and economical design
the selection of loads and its combination is
very much essential.
Taking all the loads into consideration (
including the loads that may not act ) will
lead to heavy and uneconomical design.
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Engg. Dept., SSNCE
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15. LOAD COMBINATIONS
A careful combination of the loads is
necessary to ensure the required safety and
economy in the design keeping in view the
probability of
(a) Loads acting together
(b) their (any particular load) arrangement in
relation to other loads and severity of
stresses or deformations caused by the
combination of various loads.
12-08-2022
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Engg. Dept., SSNCE
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16. The combinations of Loads has been given in IS 875 ( Part-5)
which is exactly as below:
8. LOAD COMBINATIONS
cl.8.0 General — A judicious combination of the loads
(specified in Parts 1 to 4 of this standard and earthquake), keeping in view
the probability of:
a) their acting together, and
b) their disposition in relation to other loads and severity
of stresses or deformations caused by combinations of the
various loads is necessary to ensure the required safety
and economy in the design of a structure.
LOAD COMBINATIONS as given in IS-875 ( Part-5)
12-08-2022 Compiled by Dr Y.K.Sabapathy, Prof.,Civil Engg. Dept., SSNCE 16

17. LOAD COMBINATIONS
as given in IS-875 ( Part-5)
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cl.8.1 Load Combinations — Keeping the aspect
specified in cl.8.0, the various loads should, therefore,
be combined in accordance with the stipulations in
the relevant design codes. In the absence of such
recommendations, the following loading
combinations, whichever combination produces the
most unfavourable effect in the building, foundation
or structural member concerned may be adopted ( as
a general guidance ). It should also be recognized in
load combinations that the simultaneous occurrence
of maximum values of wind, earthquake, imposed and
snow loads is not likely.
Compiled by Dr Y.K.Sabapathy, Prof.,Civil
Engg. Dept., SSNCE

18. LOAD COMBINATIONS
as given in IS-875 ( Part-5)
DL = Dead Load,
IL = Imposed Load,
WL = Wind Load,
EL = Earthquake Load,
TL = Temperature Load.
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19. e.g. for Combination of loads
(by using codes various countries)
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Engg. Dept., SSNCE
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20. Basic Code for Design
IS 456 : 2000 — Plain and reinforced concrete –
Code of practice (fourth revision)
Design Handbooks
SP 16 : 1980 - Design Aids to IS 456 : 1978
SP 24 : 1983 - Explanatory Handbook on IS 456 :1978
SP 34 : 1987 - Handbook on Concrete Reinforcement and
Detailing
SP 23 : 1982 - Design of Concrete Mixes
12-08-2022
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Engg. Dept., SSNCE
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21. Loading Standards (related IS codes)
The loads to be considered for structural design are specified
in the following loading standards:
IS 875 (Parts 1-5) : 1987 — Code of practice for design loads
(other than
earthquake) for buildings and structures (second revision)
Part 1 : Dead loads
Part 2 : Imposed (live) loads
Part 3 : Wind loads
Part 4 : Snow loads
Part 5 : Special loads and load combinations
IS 1893 : 2002 — Criteria for earthquake resistant design of
structures (fourth revision).
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Engg. Dept., SSNCE
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22. DEAD LOAD ( FROM CODE)
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Engg. Dept., SSNCE
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23. 12-08-2022
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Engg. Dept., SSNCE
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24. DEAD LOAD ( FROM CODE)
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Engg. Dept., SSNCE
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25. DEAD LOAD ( FROM CODE)
12-08-2022
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Engg. Dept., SSNCE
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1 kN is equal to 101.9 kgs

26. DEAD LOAD ( FROM CODE)
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Engg. Dept., SSNCE
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27. DEAD LOAD ( FROM CODE)
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Engg. Dept., SSNCE
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28. 12-08-2022
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Engg. Dept., SSNCE
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29. Live load ( from Code)
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Engg. Dept., SSNCE
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30. Live load ( from Code)
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Engg. Dept., SSNCE

31. Live load ( from Code)
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Engg. Dept., SSNCE

32. Live load ( from Code)
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Engg. Dept., SSNCE
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33. 12-08-2022
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Engg. Dept., SSNCE
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34. WIND LOAD
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Engg. Dept., SSNCE
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35. Effect of wind load on structures
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Engg. Dept., SSNCE
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Etabs –software used for wind load analysis on Multi storied Buildings

36. Wind Load
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Engg. Dept., SSNCE
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37. 12-08-2022
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38. TOP OF BHUJI KHALIFA
SWINGS 1.5 M WHEN
THERE IS A HEAVY WIND
FLOW
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Engg. Dept., SSNCE
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39. 12-08-2022
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Engg. Dept., SSNCE
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40. Wind Load
12-08-2022
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Engg. Dept., SSNCE
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41. 12-08-2022
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Engg. Dept., SSNCE
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42. Wind Load
12-08-2022
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Engg. Dept., SSNCE
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43. 12-08-2022
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Engg. Dept., SSNCE
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44. Snow load
12-08-2022
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Engg. Dept., SSNCE
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45. Snow load
12-08-2022
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Engg. Dept., SSNCE
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46. 12-08-2022
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Engg. Dept., SSNCE
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Snow load

47. 12-08-2022
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Engg. Dept., SSNCE
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Snow load

48. Special Loads
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Engg. Dept., SSNCE
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49. Special Loads
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Engg. Dept., SSNCE
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50. Hydro static pressure on dams
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Engg. Dept., SSNCE
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51. EARTHQUAKE LOAD
– STUDIED UNDER A SEPARATE SUBJECT
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Engg. Dept., SSNCE
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52. 12-08-2022
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Engg. Dept., SSNCE
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SESIMIC ZONE MAP OF INDIA

53. 12-08-2022
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Engg. Dept., SSNCE
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SESIMIC ZONE MAP OF INDIA

54. End of part-1
12-08-2022
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Engg. Dept., SSNCE
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