Question)
Determine the support reactions of the given beam:
Since it is a simply supported overhang beam, it can be re-drawn as below
We will first use the equations of statics to find out the external reactions.
Employing ΣFx = 0;
Bx = 300 N
Bx is in a direction from left to right.
Employing ΣFy = 0;
Ay + By = (75 N-m)*(6m + 8m) + (500 N) + (200 N) + (300 N)
Or Ay + By = (2050 N) ……….(1)
Employing ΣMA = 0; that is taking sum of moments about point A
(75 N/m)*(14 m)*(14/2 m) + (500 N)*(6 m) + (200N + 300 N)*(6m+8m) + (2400 N-m) = By *(6+8 m)
(7350 N-m) + (3000 N-m) +(7000 N-m) + (2400 N-m) = By *(14 m)
Or By *(14m) = 19750 kN-m
Dividing both sides by 14 m
Or By = 1410.71 N
Now from equation 1, we have,
Ay + By = (2050 N)
Or Ay + 1410.71 N = (2050 N)
Or Ay = (2050 N) – (1410.71 N)
Or Ay = (639.29 N)
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