Shear force and bending moment diagram

AI Thread Summary
The discussion focuses on the challenges faced in solving a shear force and bending moment diagram for a beam. The participant struggles with calculating the reactions at supports, specifically identifying a signage error in the vertical force equilibrium equation. Correctly summing forces and moments is emphasized, particularly the need to assign signs based on the chosen direction for moments. The importance of drawing a free body diagram (FBD) is highlighted as a critical step in the solution process. Understanding these concepts is essential for successfully completing the assignment.
Lowrie
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Homework Statement



I have an assignment that is similar to the following question. I believe if i am able to do this question i will be able to do the assignment. However I cannot seem to be able to get this question right. Below the question and answer.

[URL]http://img220.imageshack.us/f/image2hy.jpg/[/URL]
http://img220.imageshack.us/f/image2hy.jpg/

Homework Equations



I have to draw a FBD, SFD, and BMD of the following beam

The Attempt at a Solution



[URL]http://img233.imageshack.us/f/imagefw.jpg/[/URL]
http://img233.imageshack.us/f/imagefw.jpg/
 
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You have a signage error in calculating Ay, which you should have realized; when summing forces in the vertical direction, Ay + By should equal the applied 4 kN force. When you sum moments about a point, and choose counterclockwise as plus, the clockwise moments get a minus sign in front of them.
 
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