443304310431 Reinforced Concrete DesignReinforced Concrete Design
Welcome to
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Instructor: Mongkol JIRAVACHARADETInstructor: Mongkol JIRAVACHARADET
School of Civil EngineeringSchool of Civil Engineering
SuranareeSuranaree University of TechnologyUniversity of Technology
Lecture 1 - Introduction
� Class Locations
Lecture: B3101
General Information
� Instructor
Asst.Prof.Dr. Mongkol jiravacharadet
� Office: 4th Floor, C Building
� Phone: (044-22) 4327
� Email: [email protected]
� Class Time
� TUE 10:00 - 12:00
� THU 10:00 - 12:00
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TEXTBOOKSTEXTBOOKS
Reinforced Concrete: Mechanics and Design, 4th Edition
James G. MacGregor, James K. Wight, Prentice Hall, 2005.
Design of Concrete Structures, 13th Edition
Arthur H. Nilson, David Darwin, Charles W. Dolan, McGraw-Hill, 2003.
Reinforced Concrete: A Fundamental Approach, 5th EditionEdward G. Nawy, Prentice Hall, 2005.
Building Code Requirements for Structural Concrete,
ACI318-05,American Concrete Institute, 2005.
Course ObjectivesCourse Objectives
More than just trial and error, design is based on built up experience
as well as a solid background in analysis and an understanding of the
parameters affecting a good design solution.
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Reinforced Concrete Design (RC Design)Reinforced Concrete Design (RC Design)
• Specifications, Loads, and Design Methods
• Strength of Rectangular Section in Bending
• Shear and Diagonal Tension
• Design of Stairs, Double RC Beam, and T-Beam
• Analysis and Design for Torsion
• Design of Slabs: One-way, and Two-way
• Bond and Achorage
• Design of Column, and Footing
• Serviceability
Content:Content:
Conduct of Course
Design Projects 20 %
Midterm Exam 40 %
Final Exam 40 %
Grading Policy
Final Score Grade
100 - 90 A
89 - 85 B+
84 - 80 B
79 - 75 C+
74 - 70 C
69 - 65 D+
64 - 60 D
59 - 0 F
WARNINGS !!!
1)1) Participation expectedParticipation expected,, check check 80%80%
2)2) Study in groups but submit work on your ownStudy in groups but submit work on your own
3)3) No Copying of ProjectNo Copying of Project
4)4) Submit Project at the right place and timeSubmit Project at the right place and time
5)5) Late Project with penalty Late Project with penalty 30%30%
6)6) No make up quizzes or examsNo make up quizzes or exams
� An Introduction to Structural Systems
� Reinforced Concrete Structures
� Mechanical Properties of Concrete
� Steel Reinforcement
11 Reinforced Concrete DesignReinforced Concrete Design
Introduction, Materials and Properties
Mongkol JIRAVACHARADET
S U R A N A R E E INSTITUTE OF ENGINEERING
UNIVERSITY OF TECHNOLOGY SCHOOL OF CIVIL ENGINEERING
Cantilever ConstructionsCantilever Constructions
CN Tower, Canada
Column
Typical Structure (1)
1st Floor
2nd Floor
Beam Joist
Spandrel
beam
Wall footingSpread footing
Typical Structure
Foundation
(Footing)
Spandrel
beam
Pier
Column
Floor slab
Main beam
(Girder)
Structural Design Concept
�������� Stability
�������� Safety
�������� Serviceability
��������Economy
��������Environment
WHY Reinforced Concrete?
� Concrete is cheaper than steel
� Good combination of Concrete & Steel
� Durability from concrete covering
� Continuity from monolithic joint
Disadvantages of RC
� Construction time
� Concrete Quality Control
� Cracking of Concrete
Reinforced Concrete (RC) Structures
Steel bars
Concrete
Section A-A
P
A
A Steel bars
compression zone
tension zone
Neutral axis
Concrete: high compressive strength but low tensile strength
Steel bars: embedded in concrete (reinforcing)provide tensile strength
Steel and Concrete in Combination
(1) Bond between steel and concrete prevents slip
of the steel bars.
(2) Concrete covering prevent water intrusion
and bar corrosion.
(3) Similar rate of thermal expansion,
Concrete: 0.000010 - 0.000013
Steel: 0.000012
Review of Concrete Properties
Concrete is a mix of :
Water Cement Ratio (W/C) :
Low W/C
High Strength
Low Workability
High W/C
Low Strength
High Workability
0.3 0.7
Optimal ratios obtained
by trial and experience
30
cm
∅ 15 cm
ASTM BS15 cm
15 cm
15 cm
( ) ( )0.85c cASTM BSf f′ ′≅
Compressive Strength of Concrete
cf ′ compression test of standard cylinder at 28 days
Normal used: 210, 240, 280, 320 kg/cm2
High strength: 350 - 700 kg/cm2
�.�.�. ��������� �.�. 2522 : < 150 kg/cm2
200
250
300
350
400
450
500
Co
mpre
ssiv
e s
tre
ng
th,kg
f/cm
2
0.4 0.5 0.6 0.7
Water-cement ratio, by weight
Air-entrained concrete
Non-air-entrained concrete
For type Iportland cement
Effect of water-cement ratio on 28 days compressive strength
Tensile Strength of Concrete
- Greatly affects cracking in structures.
- Tensile strength is about 10-15% of compressive strength.
Splitting Tensile Test (ASTM C496):
L
P
P
D2
ct
Pf
LDπ=
2
2
1.59 1.86 kgf/cm for normal-weight concrete
1.33 1.59 kgf/cm for light-weight concrete
ct c
ct c
f f
f f
′≈ −
′≈ −
Standard Beam Test (ASTM C78):
P
r
Mcf
I= = Modulus of rupture
Tensile Strength in Flexure
7.5 psi 2.0 kscr c cf f f′ ′= =
Practical choice for design purposes
Stress-Strain Relationship of Concrete
0.003≈
Ultimate strain
εASTM
σ
cf ′
0.5 cf ′
Initial modulus
Secant modulusat = Ec0.5 cf ′
εεεεcu
Concrete & Steel StrengthConcrete & Steel Strength--DeformationsDeformations
REINF.
ROD
CONCRETE
L
∆L
εc = ∆L/L = εs
Strain
σCompression Steel
Tension
Concrete
ε1
fs
fc1
ε2
fy
εy
fc2
ε3
fy
εcm
f’c
εcu
Failure
Strain
fy
0.85f’c
Modulus of elasticity
Concrete: 1.533 psic c cE w f ′=
lb/ft3 psi
1.54, 270 kscc c cE w f ′=
t/m3 ksc
315,100 ksc for 2.32 t/mc c cE f w′= =
62.04 10 kscsE = ×Steel:
Concrete Weight
Plain concrete = 2.323 t/m3
Steel = 7.850 t/m3
Reinforced concrete = 2.400 t/m3
Lightweight concrete = 1.6 - 2.0 t/m3
Steel Reinforcment
Round Bar ("#$%��$&'()"�*+)
SR24: Fy = 2,400 ksc, Fu = 3,900 ksc
Deformed Bar ("#$%�012212*)
SD30: Fy = 3,000 ksc, Fu = 4,900 ksc
SD40: Fy = 4,000 ksc, Fu = 5,700 ksc
SD50: Fy = 5,000 ksc, Fu = 6,300 ksc
Stardard Reinforcing Bar Dimension and Weight
RB6
RB9
DB12
DB16
DB20
DB25
DB28
DB32
0.28
0.64
1.13
2.01
2.84
4.91
6.16
8.04
0.222
0.499
0.888
1.58
2.23
3.85
4.83
6.31
1.89
2.83
3.77
5.03
5.97
7.86
8.80
10.06
BAR SIZE(mm)
AREA(cm2)
WEIGHT(kg/m)
PERIMETER(cm)
