Design of beams
Beams are members subjected to simple or double bending the best cross section are S.I.B or B.F.I beams , for bigger spans the plate girder section is used .
Design Considerations
first :Proportioning for strength in bending with due regar of stability of the compression flange and also the adequacy of the selected shape to develop , required strenth in shear .
second : Proportioning for stiffness with due regard to deflections of the member and prevention of excessive deformation under service condition .
third Proportioning for economy , particularly the selection of a beam size and grade of steel which would lead to an economic design
The B.F.I. sections have greater lateral stability due to thier wide flange .
The uniform thickness of the flanges facilitates riveting or welding off connections < A type of light beams is the castellated beam , the section modulus of the expanded section is increased
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