Fixed Support on a Plane

It depends on the composition of the plate or slab. A composite material, like concrete, can easily have different coefficients for tension and compression.

That's true, but the inquiry is, whether the force will be the same on the top plate. nothing about it being in tension or compression.

No, the inquiry asks, "Does the FIXED SUPPORT located on the top of a plate will have an equivalent deflection as the FIXED SUPPORT located on the bottom of the plate?"

Nowhere in the question is the deflection of the PLATE mentioned.

lyn, I was addressing to redfred,

Lyn, why don't you stop being so anal and 'Take a hike'

Deal with it.

Read the question more carefully, and don't be such a baby!

good one.

The plate will be in both tension and compression in both cases. The relevant question is the support point connections. In one case only compression exists at the support points.

In one case only compression exists at the support points.

I agree

Phoenix is correct...

acceleration of gravity

Dynamic loads?

never assume anything.

I was editing my reply when you corrected me. I thought the applied force was in the opposite direction. My bad...

actually when I thought it was initially a static load, until I read you post. I never thought of impact loads.

This smells of homework.

if it is, its very rudimentary that only required a discreet answer.

Common Core Math Engineering ? :-)

True.. no false.... no,... all of the above.

That should cover it.

When in doubt? "C" out.

That plane will NEVER fly.

The OP's wording of the supports having deflection makes little sense.

As for the plate deflection, in both cases the upper chords are in the same amount of compression and the lower chords in the same amount of tension. Hence deflection the same.

The strengths of the attachments may differ because of compression versus tension.

Until the elevator starts up.

"The OP's wording of the supports having deflection makes little sense."

It is obvious that English is not the OP's first language. He/she needs to find a technical person who speaks his/her language, but whose first language is English, to edit the question. Once the question is phrased correctly in English, then we could be more sure of providing the appropriate answer.

I definitely appreciate having the drawings to clarify the concepts, yet when I measure the left-hand drawing, the downward force appears to be at 0.60 of the support separation, while in the right-hand drawing, the the downward force is at 0.54 of a larger separation. I suspect that they are just carelessly made drawings, and that the intention is that the downward force should be centered between the two equally spaced upward forces in both drawings.

Finally, the triangles of the left-hand drawing indicate to me knife-edge contacts, which exert only vertical forces on the plate. I have yet to see a knife-edge that can pull, so the right-hand drawing needs eye bolts or something along that line that can pull upward, yet can't fairly be compared to knife edges.

OK-Yes, I'm nit-picking! ...but a correctly worded and accurately illustrated question is MUCH more likely to obtain the desired response.

considering the nationalities, some tolerance should be considered. As well as feedback from the OP. usually we can push through this.

Thru the plate, welded full pen with gussets on top.

Fixed Supports are exactly what they say they are: Fixed, unmovable points in spacetime. They are the reference points that you make your calculations from.

By the way, THIS IS NOT A "WE DO YOUR HOMEWORK FOR YOU" SITE!