Question

F6-5. Identify the zero-force members in the truss, 3 KN -2 m -2 m- D 1.5 m

identify the zero fórce members in the truss

Answer 1

# Free body diaggum 18KN le 15m B form equili briums equations . Efxzo RATREH = 0 Efyzo REV=3kN Lexo force member If only two member forms truss joint and no Pocternal loay or support reaction is appleich to the joint, the members are must be Zero -force memberi

in giver Figure # - For = 0 KN FBC =0 KN DC anel BC are Zero Force member- F to find out Force section let's talce melhood of in AD element E FELL IN . 1.5m 43 1 3 A 2 TA, B tikce moment about point B.: This Į MAGO leifepx15m.co. THED FOKN] $ ED is an Zeno force memben. But FBD = 3KN clension)

tana= list of 36.800 FEB sino = 3kN FER Caso = -FAB Thés FEB=-3 5th(369) 3-5KN (compressim] O FAR -(-5) es (36-9) = 4 kN. Cjensim ) at joint I EL FAE RA FAB4kn FAB = -RA - RA = -4KN ITAE = okn AE san Zero force member » Zero Fore member sare # DC #ED # AE #BC
The zero force members are link DC,ED,BC,and AE.