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in Physics by (58.2k points)

Determine the reactions for the simply supported beam of Figure.

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Taking moments about B gives:

RA × 4 m + 8 kN m + 6 kN × 1 m = 10 kN m

i.e. 4RA = 10 − 8 − 6 = −4

from which, RA =-4/4 = −1 kN

(acting downwards)

Resolving forces vertically gives:

RA + RB + 6 = 0

from which, RB = −RA − 6 = −(−1) − 6

i.e. RB = 1 − 6 = −5 kN

(acting downwards) 

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