Development Of Optimization Of Steel Castella As The Steel Beams Construction

Abstract

ABSTRACT

Beam castella (castellated Beam) is formed by beams of profile H-beam, i-beam or wide flange beam used for construction of long span more than 8 meters by modifying the ' web ' of her being higher than the original profile. The web part is cut with a pattern of castella and then hooked up again with the way las. The result of the merged profile pieces will form holes with 3 shapes: hexagon (honey comb), rhombi, and circles (circular). These profiles are perforated to minimize the weight of its own profile. Castellated beam profile can be used for beams, the eastern limit of block length either as on the roof. With the overhaul of the steel changes and becomes a form of castella will experience a reduction in the weight of the steel itself and increase the height of the steel profile according to the desired.

This research was conducted to determine the influence of angle (Ø), high (h) and width (e) profile-pieces of steel beams on elastic behavior of castellated beam. This study applies the model of castellated beam horizontal zig-zag profile test objects with WF 200.100.5.5.8. WF intact then formed steel castella with angle, height and width of the cutting profile is different for each test object. The test objects to cutting corners the profile treatment namely Ø₁ = 0˚ (whole), Ø₂ = 45˚,  Ø₃= 50˚,  Ø₄ = 60˚, Ø₅ = 65˚,  Ø₆= 70˚ and  Ø₇=75˚. The test objects for high profile cutting treatment i.e., h₁ = 0 mm (whole), h₂ = 26 mm wide, h₃=50 mm, h₄=76mm, h₅=102, 5 mm, and h₆ = 150 mm. width of the treatment to test objects are pieces of profile (e) i.e. e_std = 51, 25 mm, e₀ = 0 (intact), e₁ = 177 mm, e₂ = 150 mm, e₃ = 125 mm, e₄= 50 mm, and e₅ = 75 mm. castellated steel beam testing Systems conducted in the laboratory is by giving a load of centered around the Middle span steel beam, and then on the test (test region) studied the behavior of steel beam while receiving the centralized load by using the tool hidrolic jack. Quality steel voltage is the voltage that occurs at the time before starting to melt. To find out the quality of steel (f_y) then pull-test test will be performed, i.e. by taking a sample of steel profiles to test his steel quality.

The results showed that at the melting condition and collapsed, cutting the corner profile (Ø) is not too influential to the strength of flexure, there was a rise in the value of this banding if large corner profile is getting bigger but the accession was not significant. When are reviewed from the angle of the cutting profile buckling condition (Ø) affects to the buckling, the greater the angle of the cutting profile (Ø) showed a trend of buckling that occurs is getting smaller. The results showed on the conditions of yielt and collapsing, cutting height profile (h) affect the strength of the flexure, the more high profile then the greater the strength of the flexure. When are reviewed from a high profile cutting of buckling condition (h) affect to the buckling, the more high profile cutting (h) there is a tendency that happens the greater the buckling. Whereas in terms of the width of the cutting profile (e), affects the value of buckling, the width of the cutting profile (e) then the greater the value of buckling. Based on the results of the study treatment angle profile pieces (Ø) on the most optimal castella steel when are reviewed from the moment, shear strength, buckling and deflection is the range between the angle 45˚- 60˚ or angle must not exceed 60˚. For high-profile pieces (h) on the most optimal castella steel recommended height pieces (h) may not exceed 50% of the high-profile intact. Is the width of the profile pieces (e) on steel the most optimal castella is e should not be in excess of 2½ times the height profile intact.

Key words: Castellated beam, the cutting angle profile (Ø) high-profile cuts, (h) and width of profile pieces (e), strength of flexure.