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what's the most illustration explanation or reason why a shear can

 
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Oct5-12, 10:42 PM   #1
 

what's the most illustration explanation or reason why a shear can


what's the most illustration explanation or reason why a shear can pass from positive to negative in say a beam?
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Oct8-12, 11:14 AM   #2
 
Sign convention dictates in which direction shear is positive or negative, so be consistant when doing an analysis.

The following site illustrates that quite nicely.
http://roymech.co.uk/Useful_Tables/B...r_Bending.html
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