The discussion revolves around determining the reaction forces (FA, FB, FC, FD) in a 3D static equilibrium scenario, particularly in relation to a load placed on a table. Participants explore the implications of load placement, symmetry, and the complexity of 3D equilibrium equations.
Participants express differing views on the implications of symmetry and load placement, with no consensus reached on how to approach the problem in the case of non-centered loads or asymmetrical supports.
The discussion highlights the complexity of 3D static equilibrium problems, including the need for multiple equations of equilibrium and the potential for statically indeterminate situations when loads are not centered.
PhanthomJay said:I didn't see much of an attempt. Is the load in the center of the table? If no, forget about finding the reactions without a computer program or a copy of Roarke's 'Stress and Strain". If yes, the solution is relatively simple.
It appears that the outrigger supports are symmetrical about the axes of the plane, in which case you could represent the loading as equivalent forces and couples appied at the COG, and compute reaction forces at the 4 supports by looking at the components of the loading about each respective axis, computing the reactive forces accordingly by applying the equilibrium equations in each direction (noting due to symmetry that the loading is shared equally by the near and far supports), then add them up algebraically (a corner support may take the maximum load).aoide said:@phantom
thanks for your explanation, i think i start to get the idea..
anyway, how about picture in this link..
http://www.flickr.com/photos/djaguank/5452658183/
could it use symetrical?? COG for body and antenna in middle.. but the leg/support not in same plane (see picture from above)
do you have email?? i want to ask you some question, please send your email to g.ghunk.np@gmail.com
thanks again