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Pelengkung 3 sendi

Pelengkung 3 sendi. S S HB B A .HA VB

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Pelengkung 3 sendi

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  1. Pelengkung 3 sendi • S • S HB B • A .HA VB VA A HA HB B VA VB

  2. Portal Konstruksi 3 sendi • 2tm 4t 2m s • 2 t 4m 4m • 1t • 4m 2m 2m 2m • A HA HB B • VA VB

  3. Contoh perhitungan • V=0 VA +VB = 8+4=12 t • H HA-HB+2=0 HA-HB=-1 • MA=0 2 .4+8.2+4.6-1.2-VB.8=0 • 8+16+24-2-8VB=0 • VB=5.3/4t • MB=VA.8+2.4-8.6-4.2-1.2=0 • 8VA=-8+48+4+2=0 • VA=6.1/4t • MS=0 (kiri) MS=0 (kanan) • VA-HA.6-2.2-8.2=0 -VB.4+HB.6+1.4+4.2=0 6 .1/4.4-6HA-4-16=0 -5.3/4.4+6HB+4+8=0 25-6HA-20=0 -23+6HB+12=0 HA=5/6t 6HB=11 HB=1.5/6t Kontrol: HA-HB=5/6-1.5/6=-1 (ok)

  4. Garis Pengaruh • Adalah suatu garis yang menunjukan besarnya pengaruh dari suatu muatan pada setiap kedudukan muatan • P • A C B • ½ L ½ L

  5. MB=0 VA.L-P(L-X)=0 • VA=P(L-X) • L • Di A X=0 Va=P • Di C X=1/2L Va=P(L-1/2L)=1/2P • L • DiB X=L Va=P(L-L)=0 • L

  6. Gambar diagram GP • MB=0 A B • VA.L-Px1=0 • Di B x=0 Va=0 P x • Di C x=1/2L Va=1/2P A B • Di A x=L Va=P • Mx=0 a b • VB .L-Px=0 A B • VB=Px/L • DiA x=0 VB=0 • Di C x=1/2L VB=1/2P =1/2t P • Di B x=L Vb = P =1 t • A B

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