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3 kN


                                                    C

2m


                          B                                  D

2m       1.5kN                                                        1.5kN




                                                                              E
 A                                            F
                     2m                 2m              2m       2m



 MA +           =0

-VE (8) + 3(4) + 1.5(8) = 0
                     VE = 3Kn

 +    Fy = 0
         VA + VE - 1.5  3  1.5 = 0
                             VA = 3kN

     + Fx = 0
       HA = 0


Zero Force Member = BF and FD
FAB
1.5 kN




 .    A                        FAF


 3 kN


  +    Fy = 0
           3+FAB sin 45 - 1.5 = 0
                        FAB = -2.12 kN

      + Fx = 0
          FAF - 2.12 cos 45 = 0
                       FAB = 1.5 kN




                                      FBC




                  .  B




2.12


      + Fx = 0
          -2.12 cos 45 + FBC 2.12 sin 45 = 0
                                    FBC = 2.12 kN
3kN




                                              .     C




                             2.12             FCF       FCD


     + Fx = 0
-2.12 cos 45 +FCD cos 45 = 0
                    FCD = 2.12 kN

 +  Fy = 0
-2.12 sin 45  FCF -2.12 sin 45  3 = 0
                               FCF = 1.5 kN




2.12




                .D




                             FDE

     + Fx = 0
2.12 cos 45 +FDE cos 45 = 0
                    FDE = - 2.12 kN
2.12            1.5




                                 .
                                 EF




                    FEF                E
                    EF

                                 3 kN

  + Fx = 0
FEF + 2.12 cos 45 = 0
             FEF = - 1.5 kN




                              FREE BODY DIAGRAM

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Method Of Joints For Truss / Roof

  • 1. 3 kN C 2m B D 2m 1.5kN 1.5kN E A F 2m 2m 2m 2m MA + =0 -VE (8) + 3(4) + 1.5(8) = 0 VE = 3Kn + Fy = 0 VA + VE - 1.5 3 1.5 = 0 VA = 3kN + Fx = 0 HA = 0 Zero Force Member = BF and FD
  • 2. FAB 1.5 kN . A FAF 3 kN + Fy = 0 3+FAB sin 45 - 1.5 = 0 FAB = -2.12 kN + Fx = 0 FAF - 2.12 cos 45 = 0 FAB = 1.5 kN FBC . B 2.12 + Fx = 0 -2.12 cos 45 + FBC 2.12 sin 45 = 0 FBC = 2.12 kN
  • 3. 3kN . C 2.12 FCF FCD + Fx = 0 -2.12 cos 45 +FCD cos 45 = 0 FCD = 2.12 kN + Fy = 0 -2.12 sin 45 FCF -2.12 sin 45 3 = 0 FCF = 1.5 kN 2.12 .D FDE + Fx = 0 2.12 cos 45 +FDE cos 45 = 0 FDE = - 2.12 kN
  • 4. 2.12 1.5 . EF FEF E EF 3 kN + Fx = 0 FEF + 2.12 cos 45 = 0 FEF = - 1.5 kN FREE BODY DIAGRAM