Calculating Vertical Support Reactions
Calculating Vertical Support Reactions
(OP)
Hello all
I was wondering if anyone could help explain how the Vertical reactions for the following structure were calculated.
https://files.engineering.com/getfile.aspx?folder=...
I am able to calculate the Horizontal reactions. It is the vertical reactions that I am struggling with.
I do the following:-
Sum Vertical Reactions = 0
Va + Vd - 230 = 0
If I take moments about D I get:-
Sum of Moments about Support D = 0
(5.4*230) + (Ha*1.8) = 0
Ha = -690kN
I just don't know how to calculate 230kN at support A.
Any advice?
Thank you.
I was wondering if anyone could help explain how the Vertical reactions for the following structure were calculated.
https://files.engineering.com/getfile.aspx?folder=...
I am able to calculate the Horizontal reactions. It is the vertical reactions that I am struggling with.
I do the following:-
Sum Vertical Reactions = 0
Va + Vd - 230 = 0
If I take moments about D I get:-
Sum of Moments about Support D = 0
(5.4*230) + (Ha*1.8) = 0
Ha = -690kN
I just don't know how to calculate 230kN at support A.
Any advice?
Thank you.
RE: Calculating Vertical Support Reactions
It is a simple truss, and usually we think in terms of the joints being pinned. If that is true there can be no vert. reaction transmitted to “D”, because there is no moment at the joint to the right of “D”. If on the other hand, the truss had fixed joints (not pinned, but continuous at the joints, or maybe just the bot. chord was continuous), then some vert. reaction would be transmitted to “D”.
Edit: But, it is an unstable truss if all the joints are pinned, unless you install a diagonal from the lower chord mid length joint up to the upper right top chord corner joint. Then, the parallelogram can not change shape.
RE: Calculating Vertical Support Reactions
Rod Smith, P.E., The artist formerly known as HotRod10