use of steel in constructing buildings

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USE OF STEEL INCONSTRUCTING

BUILDINGSThe advantages to building with steel are enormous! To start with,homes built with steel have straighter walls and fewer cracks thanhomes built with wood. In addition, steel is dimensionally stable andwon't warp, rot buckle, or split, providing substantial savings inlong-term maintenance and energy costs and higher resale values.Steel is the ideal building material for these environmentallyconscious times. It is nontoxic and 100% recyclable!


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Generally there are twotypes of steel bars

("Sariya" inHindi) available in the

market.Mild steel barsDeformed steel bars


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ee ars use orconstruction work


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Mild steel bars (as perIS: 432, part-I -1982)

Mild steel bars are used for tensile stress of RCC(Reinforced cement concrete) slab beams etc. inreinforced cement concrete work. These steel bars are

plain in surface and are round sections of diameterfrom 6 to 50 mm. These rods are manufactured in longlengths and can be cut quickly and be bent easilywithout damage.


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Deformed steel bars(as per IS: 1786-1985)

As deformed

bars are rods

of steelsprovided with


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ar ous ra es oSteel Bars

Reinforcement bars in accordance withstandard IS No. 432 part-I can beclassified into following types.

1) Mild Steel Bars: Mild steel bars canbe supplied in two grades

Mild steel bars grade-Idesignated as Fe 410-S orGrade 60

Mild steel bars rade-II desi nated as


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Physical Requirement:S.No Types of

nominal sizeof bars

UltimateTensileStress

N/mm2 minimum

Yield StressN/mm2

ElongationPercent minimum

1. Mild SteelGrade I orGrade 60

For bars up to20mm

410 250 23

For barsabove 20mmupto 50 mm

410 240 23

2. Mild SteelGrade-II orGrade 40

For bar up to20mm

370 225 23

For barsabove 20mm

370 215 23


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3. Medium Tensile Steel

Grade-75

for bars upto 16mm

540 350 20

for barsabove 16 mm

up to 32mm

540 340 20

for barsabove 32 mmup to 50 mm

510 330 20


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Steel Bars for RCCWork

All finished steel bars for reinforced work should be neatly rolledto the dimension and weights as specified. They should besound, free from cracks, surface flaws, laminations, rough,

jagged and imperfect edges and other defects. It should be

finished in a work manlike manner.


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steel bars inreinforcement

Steel bars are clear, free from loosemil scales, dust and loose rust coatsof paints, oil or other coatings which

may destroy or reduce bondstrength.

Steel bars should be stored in such a

way as to avoid distortion and toprevent deterioration andcorrosion.

Steel bars should not be clean by oily


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The cranks in the bar at the end

should be kept in position by usingspots.

The steel bars should not be

disturbed while lying cementsconcrete.

Required cover under steel bars

should be given before laying thecement concrete.

No over lap is given in the bar having

a diameter more than 36 mm, if


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Weight of Different

Steel Bars

When any type of steel members for use in house construction isrequired, we calculate the length of steel member in feet or meter but

we are ignorant about the weight of steel.Here are details of weight per meter for various types of steelmembers:-

This will help us for estimated weight and cost. It will also help at thetime of purchase to avoid pilferage in weight.


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M S Steelround &square Bar

Sr.No. Dia of steel

bar

Weight per

meter

Round Bar Square Bar

a. 6 mm 0.22 Kg.0.28 Kg

b. 8 mm 0.39 Kg 0.50 Kg

c. 10 mm 0.62 Kg 0.78 Kg

d. 12 mm 0.89 Kg 1.13 Kg

e. 16 mm 1.58 Kg 2.01 Kg


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f. 20 mm 2.46 Kg 3.14 Kg

g. 25 mm 3.85 Kg 4.91 Kg

h. 28 mm 4.83 Kg 6.15 Kg

i. 32 mm 6.31 Kg 8.04 Kg

j. 36 mm 7.99 Kg 10.17 Kg

k. 40 mm 9.86 Kg 12.56 Kg

l. 45 mm 12.49 Kg 15.90 Kg

m. 50 mm 15.41 Kg 19.62 Kg


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STANDARD

The coated sheet steel used in the manufacture of steel studsand joints must meet very specific material standards. Mostcommonly, ASTM A653 standard specification for structuralquality cold rolled sheet (replacing ASTM A446) is used to ensurethe sheet steel is suitable for structural applications.


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THICKNESS

Steel is available in many different thicknesses and strength levels.The common design thicknesses are 0.018, 0.033, 0.036, 0.044, 0.048,

0.060, 0.075, and 0.105 inches (exclusive of any metallic coatings). Itis important to specify sheetthickness by the decimal thickness to guarantee a minimum thicknessof delivered product.


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STRENGTH

The sheet steel can be supplied in different strength levels tomeet the structural requirements of the project. In general,for load bearing product it is common to use material with ayield strength of 33 ksi for thicknesses up to 0.048 inches. Formaterial in thicknesses 0.060 inches and greater, a 50 ksi yieldstrength material is common.

use of steel in constructing buildings

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