Page 33 - Flipbook Mekanika Statis Tentu
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1. Menghitung reaksi tumpuan
Sin 45° = 0.71 | cos 45° = 0.71
ΣMA = 0
(Q . 3) + (Py . 9) – (RVB . 12) = 0
(1 . 6 . 3) + (2 . 0,71 . 9) – (RVB . 12) = 0
18 + 12,78 – 12 RVB = 0
30,78 = 12 RVB
RVB = 2,57 t ( )
ΣV = 0 Kontrol
ΣV = 0
RVA – Q – Py + RVB = 0 RVA – Q – Py + RVB = 0
RVA – 6 – 1,42 + 2,57 = 0 4,85 – 6 – 1,42 + 2,57 = 0
RVA = 4,85 t ( ) 0 = 0 (OK)
ΣH = 0
RHA – Px = 0
RHA = P cos 45°
RHA = 2 . 0,71
RHA = 1,42 t ( )
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