2. Two channels are welded at the top and bottom flange to form a box column and a compact section Properties of each channel A = 5350 mm² d = 250 mm b, = 100 mm t₁ = 15 mm t₂ = 10 mm I, = 52 x 10 mm 1,= 5 x 10 mm = 29 mm F₁==345 MPa If the length of the columns 4 m and K = 1.0 both axes A. Determine the critical slenderness ratio of the built up column B. Calculate the allowable and ultimate axial load of the column

How to make a effective stiffness matrix for this figure?

Two 20 mm thick slabs are joined by a 10 mm thick slab as shown in the figure. The bolts used as fasteners are A325 bolts with a diameter of 5/8" with threads outside the shear plane. The quality of the steel plate is BJ 37. Calculate the design tensile resistance that is allowed to work on these structural members!

Determine the compressive force (in lb) in the bars shown after a temperature rise of 173°F if d = 0.015 in. Round off the final answer to five decimal places. Use the following data: Bronze              Aluminum A = 2.24 sq. in          A = 2.78 sq. in  E = 14959726 psi            E = 10594540 psi L = 12.5 in            L = 16.6 in α = 11.61 x 10-6/ °F      α = 12.67 x 10-6/°F