Anybody recognize this problem in any text books?

[SKJ25POL]

Hello All
I am curious if any of you recognize what text book this figure you may have seen?
I greatly appreciate it if you recognize this figure and recall what book you may have seen it.

Respectfully,
Sk

 

[JoelTXCive]

I don't recognize the photo. I'm guessing a statics textbook, or a structural analysis book.

It's statically indeterminate, which was not covered in my undergraduate statics class; so I'm guessing a structural analysis textbook.

Is that a "moment spring" of some sort in the middle?

 

[BAretired]

I don't recognize the photo either. The structure would be statically determinate if the central pin was raised or lowered. In the first case it would be a 3 hinged arch. In the second case, it would be a pair of tension members. As it is, the structure is in a "fall through" situation where the members are changing from compression to tension, so an analysis would need to consider the strain of the members to determine the forces in the two members.

BA

 

[driftLimiter]

Also reminds me of a plastic analysis of a beam. Where the bending spring in the middle has constant moment of Mp.

 

[dik]

With two pinned ends, not one on a roller, it's a tricky plastic design problem, too... maybe a really stiff catenary?

So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[rb1957]

but the two pinned ends are not shown to be joined ... so maybe that releases the axial deflection ?

if no axial restraint assumed, then the solution is "easy" the moment at the CL is known, the spring will permit so displacement.

if axial restraint is active then a redundant problem, some beam moment is reacted by the axial couple.

I haven't seen the problem in a text, but the style looks "old fashioned".

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[GregLocock]

As driftlimiter says it looks like the sort of mechanism you draw for a fully plastic frame, in this case 2*MP*theta=2*L/2*theta*W/2 or so.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[JohnRwals]

Maybe this book...

Vector Mechanics for Engineers
by Ferdinand Beer (Author), E. Johnston

 

[SKJ25POL]

JohnRwals (Structural),
Thank you for your response. I appreciate it. However, I didnt find this in "Vector Mechanics for Engineers". If by the chance you seen it there I appreciate stating the edition and chapter that you found it there.

To all,
I appreciate your interest in expressing your ideas on this figure but I appreciate keep the discussion focused on the main request of the post, which is the source of this picture. No need for analysis or other discussions. I just want to know if anybody have spotted it in any college text books either grad or undergrad level.


Appreciate you all
Respectfully,
Sk

 

[SnTMan]

SKJ25POL, might one ask, where did you get it?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand