The following are the properties of a steel section to be used for a beam section: Fy = 248 MPa Area = 21300 mm² Ix = 300×106 mm⁴ Iy = 98.8×106mm⁴ Sx=2.08×106 mm³ Sy = 0.746×106mm³ d = 289mm tw = 19.2mm tf = 31.8mm bf = 265mm w beam in kN/m = 9 laterally unsupported length, Lb = 3000 mm   1. What is the minimum unsupported length of the beam to be considered long?  a. 16.2 m b. 14.5 m c. 13.6 m d. 12.8 m 2. What is the critical depth over thickness ratio set by NSCP?  a. 206.68 b. 126.68 c. 106.68 d. 16.68 3. What is the allowable bending stress in the given beam section?  a. 148.8 b. 163.68 c. 142.68 d. 124.68 4. If the laterally unsupported length been 10 m, what is the allowable bending stress as per NSCP 2001?  a. 148.8 b. 163.68 c. 142.68 d. 124.68

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Types and properties of steel

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur,  chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated around the world, each with its chemical composition, and special numbering systems have been devised in various countries to classify the vast number of alloys.