1. A) Determine LRFD design tensile strength of "problem 2 in HW3" as copied below. If we use A572 Grade 50 Steel: Fy= 50ksi, Fu= 65ksi, t=1/2 in and Resistance factor: t=0.90 for yielding, ot = 0.75 for rupture For the two lines of bolt holes shown in Fig. 3.6, determine the pitch that will give a net area DEFG equal to the one along ABC. The problem may also be stated as follows: Determine the pitch that will give a net area equal to the gross area less one bolt hole. The holes are punched for 3/4-in bolts. FIGURE 3.6 D A 2 in E 2 in F 0 2 in ¦G Pitch Pitch B) If U=0.9 Determine LRFD design tensile strength.