2. A W21 x 57 of A992Gr50 steel column having length of 7 m and is fixed-pinned support (Gr50 steel = 50 ksi= 345 MPa = Fy) is used to carry a load of 900 kN dead load and 400 kN live load. Properties of W21 x 57 A = 10800 mm d=536 mm b, = 168 mm t,= 17 mm t = 10.8 mm Kd = 29.4 mm r. = 213 mm R, = 34.8 mm a. Calculate the critical slenderness ratio of the W section if the column is braced at 4 m from the pinned support of the weak axis (10) b. Calculate the compressive capacity of built-up section using ASD and LRFD (2 c. Calculate the demand-capacity factor, Is the section adequate??

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Properties of Aluminium

Aluminum (or Aluminum) is a silvery-white in color metal. The chemical symbol of aluminum is Al and it has an atomic number (Z) of 13 in the periodic table. The aluminum name for this metal is derived from the Latin word ‘alumen’, which means bitter salt. Aluminum was discovered in the year 1825 by Hans Oersted, and later Friedrich Wöhler isolated aluminum. It is the most commonly found metal in the earth’s core, which is around 8% of the total core mass. Moreover, it is the third most commonly found element on earth after oxygen and silicon. Electron distribution of aluminum per shell is 2, 8, and 3 with a valency of 3. Atomic weight is nearly 26.9815 u.