3D Truss Reactions "By Hand"?

[@saqib3s]

Thanks again sir, I wish you were teaching here in our university. Can you make a video about how to find a 2d/3d truss is determinate or indeterminate?

[@NaseebullahAhmadi-u7w]

Good

[@andrewhumirang9067]

Correct LOL.. I did this in Staad LOL

[@1963rzr]

good. thanks for letting me know

[@shendmorina1238]

nice

[@raghadsabagh1563]

Thane you very much 🩶

[@سبيسفريم]

مرحبا

[@JS-fx3wd]

Interesting, but for a roller in 3D, two reactions are required. A roller can move in only one direction, meaning that there are reaction(s) in all other direction(s). In the case of 2D, a roller moves in one dimension and a reaction is necessary to impede motion in the other dimension. Since 3D has an extra dimension, the rule does not change, therefore, a 3D roller must have two reactions. I wrote a code on MATLAB and it shows that for rollers in 3D, you must have two reactions. Similarly, a 3D pin has three reactions because lateral motion in all dimensions is not allowed.

[@1963rzr]

not really, no

[@1963rzr]

for this class, in the theory I explain to my students the roller is the equivalent to the support called "ball" and the one with two reactions we called it "slotted bar"