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Presentation Transcript
Properties & Section of Steel Presented by, Engr. Md. Nazmul Alam Chief Instructor (Tech/Civil) Rangpur Polytechnic Institute
Properties of the steel Strength. Toughness. Ductility. Weldability. Durability.
Ductility Ductility is a measure of the degree to which a material can strain or elongate between the onset of yield and eventual fracture under tensile loading as demonstrated in the figure below.
Toughness Toughness of steel and its ability to resist brittle fracture Mechanical properties of steel Modulus of elasticity, E = 210,000 N/mm Shear modulus, G = E/[2(1 + )] N/mm , often taken as 81,000 N/mm Poisson's ratio, = 0.3 Coefficient of thermal expansion, = 12 x 10-6/ C (in the ambient temperature range).
Difference between LRFD and ASD design ASD checks service load stresses against an allowable stress, whereas LRFD uses factored load forces against a maximum strength LRFD. ASD is the more traditional method and has been in use for many years. LRFD will result in stronger structures for more highly dynamic loads and ASD will result in stronger structures for less variable (more predicable) loads
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