Problem 3.2-A (with revision)\ A double-angle tension member, 2 L

3\\\\times 2\\\\times (1)/(4)

LLBB (Long Leg Back-to-Back), of A36 steel is subjected to a dead load of 20 kips and a live load of 30 kips. It is connected to a gusset plate with 3/4-inch-diameter bolts through the long legs. Does this member have enough strength? Assume that

A_(e)=0.85A_(n)

.\ a. Use LRFD.\ b. Use ASD.\ c. Between LRFD and ASD, which method is more economical in this problem?\ Show your work how you came to the conclusion.\ Partial answer key: (a)

\\\\phi P_(n)=72.6k

(b)

(P_(n))/(\\\\Omega )=48.4k

\ Textbook Problem 3.2-3 (with additions)

Problem 3.2-A (with revision) A double-angle tension member, 2L321/4 LLBB (Long Leg Back-to-Back), of A36 steel is subjected to a dead load of 20 kips and a live load of 30 kips. It is connected to a gusset plate with 3/4-inch-diameter bolts through the long legs. Does this member have enough strength? Assume that Ae=0.85An. a. Use LRFD. b. Use ASD. c. Between LRFD and ASD, which method is more economical in this problem? Show your work how you came to the conclusion. Partial answer key: (a) Pn=72.6k (b) Pn/=48.4k Textbook Problem 3.2-3 (with additions) FIGURE P3.2-3