Question

Consider a W21x93. Determine the moment capacity of the beam. Assume the compression flange is not laterally braced and that the unbraced length is 15 feet. Assume Cb

Answer 1

The answer is "828.75"

Step-by-step explanation:

Please find the correct question:

For W21x93 BEAM,

`Z_x = 221.00 in^3 \\\\\to (b_t)/(2t_f) =4.53\\\\\to (h)/(t_w)=32.3`

For A992 STREL,

`F_y= 50\ ks`

Check for complete section:

`\to (b_t)/(2t_f) =4.53 < (65)/(√(f_y = 9.19))\\\\\to (h)/(t_w) =32.3 < (640)/(√(f_y = 90.5))`

Design the strength of beam =
`\phi_b Z_x F_y\\\\`

`=0.9 * 221 * 50\\\\=9945 \ in \ \ kips\\\\=(9945)/(12)\\\\= 828.75 \ft \ kips \\`