Following is a discussion on the Reviewer item titled: Problem 001-mj | Method of Joints. Feel free to add your own comments!
Following is a discussion on the Reviewer item titled: Problem 001-mj | Method of Joints. Feel free to add your own comments!
Why does the Hinge support have a downward force instead of upward?
This is because the Summation of Forces along Y-axis is equal to
+Rd-50kn+Ra = 0 (assuming Reaction to the Hinge support is positive.)
Rd = 53.33 (Substituting Rd to the equation.)
+53.33 - 50 + Ra = 0
Ra = -3.33 (Negative means you have the opposite assumption to the reaction.)
this is why the hinge support has a downward force instead of upward.
Because weight goes down.
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