Select the most economic A992 Fy50 ksi W shape to use as a c

Select the most economic A992 (Fy=50 ksi) W shape to use as a column for the following conditions. Axial dead load of 75 kips, axial live load of 75 kips, length of the column is 12 ft, with no intermediate bracing, pinned top and bottom 2, 3. Use table 10.6 to answer the following questions about A36 double angle compression struts, pinned at both ends. A double-angle compression member 8 ft long is composed of two A36 4x3x5/16 steel angles. Determine the maximum factored axial compression load for the angles

Solution

2) Dead load=75 kips

live load=75 kips

Design load on column=(1.2*75)+(1.6*75)=210 kips

effective length of column=12 ft

the most economical column would be the lightest column with capacity greater than 210 kips

The required section is W8x31 per Table 4-1 of AISC