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Reinforced Concrete
S.Sreenath
19 May 2016
Rebar
Reinforced concrete is a combination of both steel
and concrete using the best properties of each.
Compressive strength of concrete.
Tension strength of steel.
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Types of Rebar
Mild steel
High yield deformed steel
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Mild steel
Grade 250 reinforcement complying to BS4449.
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Mild Steel
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Mild Steel
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Stress - Strain Graph
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Stress – Strain Curve of Mild Steel
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High yield deformed steel
Increase in yield strength meant that the assured load
bearing capacity enables a more efficient and simplified
reinforcement detailing, translating to material cost savings.
A high level of ductility ensures that NatSteel's high strength
steel can better withstand bending tests with no visible
fractures or cracks
All NatSteel's products are tested safe and radiation-free.
Radiation screening is performed on every incoming load of
metal waste received and radiation tests are also conducted
during the steel-making process.
Manufactured in accordance to stringent world-wide quality
assurance standards of SS2: Part 2: 1999.
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Stress – Strain Curve of High Strength
Steel
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Rebar Markings
4 T 25 01 – 125
4 – Number of bars
T – Type of steel
25 – Diameter of bars
01 – Bar mark of bar
125 – Spacing of bars
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Fabric Reinforcement
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Advantages of Welded Mesh
Flexibility and controlled manufacturing to suit any structural
requirement either in flat sheet or shaped form.
High and consistent quality welded mesh delivered just-in-
time to site.
Improved site productivity with reduced reliance on
manpower on-site.
Material wastage is controlled and reduced.
Reduced cost due to enhanced speed of construction.
Better utilisation of on-site space and logistics.
Welded mesh conforms to SS 18:1999, SS 32:1999, BS
4482:1985, BS4483:1998 or AS/NZS 4671:2001.
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Wall and Slab Mesh
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Drain Mesh
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Pilecap Mesh
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Precage column
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Lift Lobby and Staircase Mesh
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Transport of Steel Reinforcement
Risk due to transport.
Risk due to lifting.
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Limit State Design
Factor of Safety.
Permissible stress – Ultimate strength / FS
Load Factor Method – Working load X FS
Limit State Method – Working load X Partial Factor
of safety and also Ultimate strengths are divided by
further partial factors of safety.
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Limit State
A condition at which a structure becomes unfit for
its intended use.
Ultimate Limit State – This requires that structure
must be able to withstand the designed loads with
an adequate factor of safety against collapse.
Serviceability Limit State – Deflection, Cracking and
Durability.
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