Question

Homework #12 Fundamental Problem 6.9 HA Determine the force in members KJ. KD, and CD of the Pratt truss. State if the members are in tension or compression. Take that P 19 kN, P 28 kN and Ps 37 kN.(Figure 1) kN 28 FCD Submit Request Answer Previous Answers Incorrect; Try Again; 5 attempts remaining Figure 1 of 1 Part B Determinethe force in members KJ, and state if the member is in tension or c H Express your answer to three significant figures and include the appropria scalars for members in tension and negative scalars for members in comp 3 m D C 2 m--2 m--2 m--2 m--2 m--2 m- Value Units FKJ PL P2 P Submit Request Answer

find FKD and well please.

Answer 1

Giiven that on the truss haun Loads as K L 3m G C 2m 2m 28 KN 3 kN P3 FKD fep Aa the Entire trus fev Analyeing gel we the reachans at A ;

AO) SMGAy()-(10)- P2 (3)- (6)0. Ay (12) 191o)- a8(8)-37(6):26 (12)- 636 o. Ay 636 2 Ay 53 KN Moment about Point D' s taken as O -53(6) 19(4)+ 28(2) - Frj (3)= (3 6 + 56 - Fr (3):0. -318 -186 KJ -186 fKs 3 = -62 KN 62 KN (C) FKT -

3 FD 53 1 a8 WT3 6- 3 FD 6* Ji3 3 fKD 1 KN (T) FKD ()zf0 .21) FD (-62) Fen58 kN (T)