Considered Formula;
i)C.W.M=A.C.W.M Where C.W.M→Sum of clockwise moment,A.C.W.M→Sum of Anti−clockwise moment ii)Fu=Fd Where Fu→Sum of upward forces,Fd→Sum of downward forcesExample 1
A heavy uniform beam AB of weight 500N is supported at its ends. The beam carries a weight of 300N at a distance of 1.5m from the end A. if the beam is 4m long. Find the thrust/tension/reaction at A and B
Solution

Turning point at Point A
Sum of clockwise moment=3000(1.5)+500(2) =4500+1000 =5500 Nm
Sum of Anti−clockwise moment=Y(4) =4Y C.W.M=A.C.W.M 5500=4Y 55004=4Y4 Y=1375 N
Sum of upward forces=Sum of downward forces X+Y=3000+500 X+1375=3500 X=3500−1375 =2125 N
The reactions at A and B are 1375 N and 2125 N respectively
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