Fixed support at A, FBD of the beam is as shown in fig,
∑H = 0
RAH = 0
RAH = 0
∑V = 0
RAV – 7.5 + 15 = 0
RAV = –7.5KN
–ive sign indicate that we take wrong direction of RAV, i.e., Force act vertically downwards. Taking moment about point A:
∑M = – MA + 7.5 × 0.75 – 15 × 2 = 0
MA = 7.5 × 0.75 – 15 × 2
⇒ MA = –24.357KN–m
–ive sign indicate that we take wrong direction of moment, i.e., moment is clockwise.
