• Support PF! Buy your school textbooks, materials and every day products Here!

Finding the forces of a beam

  • Thread starter 1question
  • Start date
  • #1
67
0

Homework Statement



Hi. Question 1-5 from http://www.slideshare.net/hotman1991/met-302-chapter-01 has me puzzled. In the support reactions in Fy, they state By + 3.00 - 9.00 = 0. I do not understand why the 3 is positive.


Homework Equations





The Attempt at a Solution



When doing it myself, I took point A as the Pivot point. So I have negative 9 kip (from that 0 to 1.5 kip triangle), By, and *negative* 3 kip from the force right beside E. Is there something wrong with my logic?
 

Answers and Replies

  • #2
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
12,798
1,666
The +3 kip load is the reaction at point A. The load of -9 kips comes from the triangular load between points A and B. Remember, the point of this exercise is to find the internal loading of the beam at point B.
 
  • #3
67
0
Wow. Cannot believe I messed that up. Crystal clear now, thanks.
 

Related Threads on Finding the forces of a beam

Replies
18
Views
1K
Replies
4
Views
869
Replies
15
Views
741
Replies
11
Views
568
Replies
3
Views
2K
Replies
3
Views
1K
Replies
4
Views
8K
Replies
3
Views
12K
Replies
11
Views
6K
Top