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Bending Moment diagram 
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#19
Mar208, 05:07 PM

P: 21

im sorry but what do you mean by setting the summations = to 0 is that just taking moments at a point and saying it is zero? also wouldnt the UDL have to cross 0 on the SFD at 2.15 as that is 4.3/2?



#20
Mar208, 05:43 PM

P: 14




#21
Mar208, 06:41 PM

P: 1,127

About the summation. Go down to the BMD. You can see by examination that the zero crossing will be a little to the right of reaction A point. Let's call that distance s meters. Move to s and calculate the bending moments. You have (without units) 17 X (1.70 + s ) = 28.9  17s 398 X s = 398s ((174 ) X s) X (s/2) = 87s^2 Sum them to zero 87s^2 + 381s  28.9 = 0 s = 0.077 m and 4.30 m You already knew 4.30 m, so the one you want is 0.077 m to the right of reaction A. 


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