Reinforcement Detailing-II

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CIVIL ENGINEERING DRAWING &GRAPHICS CH (1+2)

Lecture 12: Reinforcement detailing-II

Dr. Mohsin Siddique Asst. Prof.

Dept. of Civil EngineeringFAST-NU

07/11/2012

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Structure

• Structure is a system of connected parts used tosupport a load

• Classification of structures▫ Trusses▫

▫ Frames▫ Membrane

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RC Structures

• Concrete:▫ Weak in tension

▫ Strong in compression▫ Compression strength >> Tensile strength▫ Compressive strength ranges from 2000-5000psi. Normally its

taken as 3000psi after 28 days

• Steel:▫ Strong in tension and compression▫ Grade 40 Steel Characteristics:

▫ Yield Point 40,000 psi▫ Tensile Strength 55,000 psi

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RC Structures

C

• To overcome the weakness of concrete in tension, steel is providedinside the concrete.

• Hence, in RC structures, compressions is resisted by concrete whiletension is resisted by steel (often termed as reinforcement).

T

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RC Structures

• Beam

• Slab• Column• Footing

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• Typical reinforcement details are drawn in class

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Conversion Table

• FPS• Bar are represented as

• #1, #2, # 3 etc• # 1 mean a bar of 1/8inch diameter

• SI

• Bars are represented by diameter in mm• ø10 or 10ø

• Conversion Table

FPS

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Slab

• Slabs are structural members which are mainly used for coveringspaces in the form of roof or floor slabs

• These may be supported on walls only or on intermediate beams.• Slabs may be simply supported or fixed ends or continuous on more

than two side supports

• Slabs are of two types depending upon the placement of mainreinforcement▫ 1. one way slab

▫ 2. two way slab

▫ If longer span/smaller span >2 the slab is termed as one way slaband

▫ If longer span/smaller span >2 the slab is termed as two way slab

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• Typical reinforcement details are drawn in class

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Column reinforcement

• Common Shapes▫ Circular▫ Rectangular or square

▫ Main or verticalreinforcement

▫ Lateral ties or spiral

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Columns

Reinforcement

Typical Longitudinal

Section of Rectangularor Circular Column

Dowel barsTypical Concretecover~1 .5 inch

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Columns Reinforcement

Section 3-3

if column is Rectangular

Section 3-3

if column Circular

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Footing Reinforcement

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#3@9”c/c

Dowel bars

8 -# 8

#4@9”c/c

#4@9”c/c

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Footing

Cross sectionof column

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THANK YOU

• Questions….

• Feel free to contact:

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