Question

Example: At a certain section in the cover plated beam of figure shown, the external factored shears are Vu=275k. Determine the spacing required for (7/8)in A325 bolts used in a bearing type connection. Assume that the bolt threads are excluded from the shear plane (A325-X), the edge distance is 3.5in, Fy=50ksi, and Fu=65 ksi. Deformation at bolt holes is a design consideration. PL in x 16 S.Sin 0.75 in W21 x 147 23.6 in 22. 1 in оооо (I, 1630 in - LSD in by 12.5 in) TOHO 0.75 in PL in 16 1 11 IL I! 1

Hi...please I want the solution of this problem of steel design of civil Engineering by using ACI_318 Amarican code

Answer 1

ook Sol Area of top flange of given member Ai= 3/4X16+ 12.5x1.15 = 26.38 in² 12 in² Area of top cover plate Az=3%*16= Now A/A, 12/26.30 0.45 <0.7 Ig (of whole section) = 3630+2 (12) *(11.425) 6760 int factored shear per inch VO I 275*(12* 17.4251 Sisaklin 6760 Bearing a strength of a bolts Rn= lizlet fu s 2.4.dt fu Lo= 3.5- (778+118) where 3 in 2 4 and Rn=1.2*3x 2 x 3/X65=351k Shearing strength of a bolts Area of one bout = (778)? 0.6 in? ñ 4

then Rn= 2 x A x Fu 01.6K 2x0.6 x 68 61.2k & Rn= 0.75 X 81:6 61.2 10.97 inch - .: spacing of boltsa Any S.58 0.75 xt = 12 Maximom spacing 31 0.75 x 29000 4 13.55 in Calculated spacing 10.97" is <maximum spacing Hence ok ob bolts with c/ spacing inch Use 7% lo inch for LFRD