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Answer 1

This is an I -Section of the beam and some time it is also termed as the H-section .In the civil Engineering this a very usefull steel structur for construction , its upper and lower latral parts are known as the FLENGE which are two in number in one section and the middle transverse part is the WEB.More than 80% moment resisted by only the flenge alone.I-section provides the greastest possible moment resistance and that is why it is widely used in the beam design .It resist more moment because the area of flenge is away from the neutral axis.

# I-section are manufactured by the hot and cold rolled steel and some time manufactired by the building processes.Beams are also manufactured by the steel and aluminium and additionally because of its geometry it has high moment of inertia and the stiffness.

#The web of the I-section provide the resistance against the shear force.these beams are not much fit for the torsional loading and avoid to use where torsion is prominant.

#The web have not to resis more in comperison to the flenge because if we draw the moment distribution diagram there are two fiber one is the upper known as the compression fiber and another is the lower known as the tension fiber.the two extremites lies on the flenge that is why the thickness provided in flenge is more and we keep the thickness of the web is less comperitively

From all it is concluded that the I-section beam for Civil Engineer and is construction field has a graet importance while we have to construct building, truss, bridge,railway station,roof and in many other structure