Question

Answer the following questions. Use lecture notes, text book and AISC Steel Construction Manual for reference. This assignment is worth 5 points. 1. (1.5 point) Determine the maximum combined loads using the recommended AISC expressions for LRFD and ASD assuming member supports a tributary area of 100 ft?: D = 80 psf, L = 100 psf, R = 25 psf, Lr = 30 psf, S = 25 psf, E = +/- 45 psf, W = +/- 100 psf 2. (1.5 point) Determine the LRFD design tensile strength of the channel tension member shown below. Use Table 2-4 preferred material for the steel type. -C10x 25 2in 5 in 3/4 in bolts 2% in 2 in 3 in 3 in 3. (2 points) Determine the LRFD design strength and the ASD allowable strength for the WT section shown below. Use Table 2-4 preferred material for the steel type. WT6 X 22.5 5% in F========= 7/8 in Ø bolts 2% in 3% in kata 3% in

ASAP please

Answer 1

Given data: D=100 psf L = 55 psf R=15 psf L. = 100 psf S = 25 psf W = 175 psf The maximum value of given LRFD combination is considered. 1.4D=1.4 x100 - 140 psf 1.2D+1.6L+0.5 (Max of L,,S,R) Since S is greater than Lx and R so it will control. 1.2D+1.6L+0.55 =1.2(100)+1.6 (55)+0.5(25) = 220.5 psf 1.2D+1.6(Max of L,S,R)(Max of 1,0.5W Since, S is greater than Lc and R and L is greater than 0.5W. 12D+1.6S+L=12x100 +1.6x25=55 = 215 psf

1.2D+W+L+0.5(Max of L, S.R) Since S is greater than Lz and R 1.2D+W+L+0.55 =1.2*100+ 75+55 +0.5 x 25 = 262.5 psf (Maximum 0.9D+W=0.9x100+75 =165 psf The maximum combination load is 193.75 psf.

The maximum value of given ASD combination is considered. D=100 psf D+L=100+55 = 155 psf D+(Max of L,.S.R) Since S is greater than Lx and R so it will control. D+S=100+25 = 125 psf D+0.75L +0.75(Max of L.S.R) Since S is greater than L. and R 1.2D +0.75L +0.75S =00+0.75x55+0.75x25 =160 psf

= 100 Psi D+0.6W = 100+ 0.6x 25 =115 psf D+0.75L +0.45W +0.75(Max of L,,S.R) Since S is greater than Li and R D+0.75L +0.45W +0.758 = 100+0.75x55 +0.45X 75+0.75 x 25 =193.75 psf (Maximum) 0.6D +0.6W =0.6x100 +0.6x25 = 105 psf The maximum combination load is 193.75 psf.