Problem No. 1 Design Member ab 1. Use A36 steel. 2. All truss members are long...

 

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Problem No. 1 Design Member ab 1. Use A36 steel. 2. All truss members are long legs back-to-back angles. 3. At each joint, truss members are connected by 3/4" thick gusset plates. 4. Assume three 3/4" bolts (Standard holes). 5. Check all limit states. D= 10k D=20k L-20k L-40k D=20k L-40k D=20k D=10k Service L-40k L-20k Loads Gage (check from Table 1-7A) a 4@10' = 40' 3' 3' 3' b 10' Table 1-7A Workable Gages in Angle Legs, in. Leg 12 10 8 7 6 5 4 3/2 3 2/2 2 1/4 1/2 13/8 1/4 1 9 g 6 5 4 4 3 3 2 2 1% 1% 1% 1 % % % % 92 91 3 3 3 2 24 2 9 92 2% 2% 3. 3 22 2 94 93 2% 2% 94 2 Note: Other gages are permitted to suit specific requirements subject to clearances and edge distance limitations. NIIII Problem No. 1 Design Member ab 1. Use A36 steel. 2. All truss members are long legs back-to-back angles. 3. At each joint, truss members are connected by 3/4" thick gusset plates. 4. Assume three 3/4" bolts (Standard holes). 5. Check all limit states. D= 10k D=20k L-20k L-40k D=20k L-40k D=20k D=10k Service L-40k L-20k Loads Gage (check from Table 1-7A) a 4@10' = 40' 3' 3' 3' b 10' Table 1-7A Workable Gages in Angle Legs, in. Leg 12 10 8 7 6 5 4 3/2 3 2/2 2 1/4 1/2 13/8 1/4 1 9 g 6 5 4 4 3 3 2 2 1% 1% 1% 1 % % % % 92 91 3 3 3 2 24 2 9 92 2% 2% 3. 3 22 2 94 93 2% 2% 94 2 Note: Other gages are permitted to suit specific requirements subject to clearances and edge distance limitations. NIIII