Answer Happy

(a)Using Method of Joints calculate forces FAB, and FBC
(b) Can the structure safely support the 45 kN load if rod BChas a diameter of 20 mm? for steel, the allowable stress is, σall.= 165 MPa
(c) For reasons based on cost, weight, availability, etc., thechoice is made to construct the rod from aluminum (σall= 100 MPa).What is an appropriate choice for the rod diameter?
(d) Calculate the following quantities: 1- σBC, main rod 2-𝝈𝐁𝐂,𝑹𝒐𝒅 𝒆𝒏𝒅 3- 𝝉𝑪, ave 4- σAB, main rod 5- 𝝉𝑨, ave 6- 𝝉𝑩, ave
100 mm Flat end A + d=25 mm cd=25 mm 40 mm FRONT VIEW e 8 50 mm 125 mm 30 mm 25 mm 20 mm TOP VIEW OF ROD BC A d=20 mm 800 mm d=20 mm Q=45 KN TOP VIEW OF BOOM AB Flat end B d=25 mm B B Q-45 KN 20 mEND VIEW 20 mm