Question

Required information For a bolted assembly with six bolts, the stiffness of each bolt is kb=1.8 Mibflin and the stiffness of the members is km=16 Mlbflin per bolt. An external load of 80 kips is applied to the entire joint. Assume the load is equally distributed to all the bolts. It has been determined to use 1/2 in-13 UNC grade 8 bolts with rolled threads. Assume the bolts are preloaded to 75 percent of the proof load. Determine the yielding factor of safety. The yielding factor of safety is

Answer 1

Q No. = 6 of bolts Kb = 1.8 Mabflin km = 16 Mebylin 8o kips 24 Ptotal - in UNC grade 8 bolts 2 Fi = 0-75A+ Sp CI 80 6 13-33 ki þs / bolt Sol- C= Kb 1.8 0-1011 Kft km [ 168+16) P = Protal/n Ptotal/N = 8 Now, tensile stress Area, At = 0.1419 in? $ (roof strength ) = 120 kpsi Fi = 0.75% 0-1419 x 120 12.771 kips. @ Yielding factor of safety Fos = SpAE is a) 1207.1419 CP+ Fi =11206 0·1011x 13-33 + 1277) ② Load Factor of safety, Spat-Fu Fos = 120x•1419 -12.771 13.16 CP •101/x 13.33 © Factor of safety based on joint separation Fos: 12.77) Fi PC1-C) 13:33 /1--1011) 11.066

Q No. = 6 of bolts Kb = 1.8 Mabflin km = 16 Mebylin 8o kips 24 Ptotal - in UNC grade 8 bolts 2 Fi = 0-75A+ Sp CI 80 6 13-33 ki þs / bolt Sol- C= Kb 1.8 0-1011 Kft km [ 168+16) P = Protal/n Ptotal/N = 8 Now, tensile stress Area, At = 0.1419 in? $ (roof strength ) = 120 kpsi Fi = 0.75% 0-1419 x 120 12.771 kips. @ Yielding factor of safety Fos = SpAE is a) 1207.1419 CP+ Fi =11206 0·1011x 13-33 + 1277) ② Load Factor of safety, Spat-Fu Fos = 120x•1419 -12.771 13.16 CP •101/x 13.33 © Factor of safety based on joint separation Fos: 12.77) Fi PC1-C) 13:33 /1--1011) 11.066