Design a circular steel section to lift a structure 3

[John188]

I want to design a steel section to lift a structure. The section is supported at 8 different points to uplift the structure. Can anyone guide me to design the section? Thanks

 

[robyengIT]

three points are enough, why 8 ??

 

[r13]

One time use, or repeat use? What is the geometry and weight of the structure to be lifted?

 

[goutam_freelance]

Insufficient information !

Engineers, think what we have done to the environment !

https://www.linkedin.com/in/goutam-das-59743b30/

 

[WARose]

Your pic wouldn't open for me.

 

[miningman]

homework????

 

[dik]

I think the question goes a little beyond homework...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[John188]

It is one time use. It is a stack liner with weight of 100T

 

[John188]

It is a stack liner with weight of 100T. So, need eight points to support it to prevent stress concerntration.

 

[John188]

It is a stack liner with weight of 100T. i need to uplift this structure and design a section for it

 

[r13]

Are you using metric or US units? What is the size of the liner (D x H), and what is the purpose of lifting - for installation or transportation?

 

[John188]

Yes, metric unit. The liner is 120m high with diameter of 3.844m at top. The purpose of lifting is for installation

 

[GregLocock]

John188, you kind of muddled the quoting function, and your answer, which I think you intended to be:

It is one time use. It is a stack liner with weight of 100T.



Cheers

Greg Locock


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

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[3DDave]

WARose,

The pic is an odd format - GIMP can open it, Windows Photo Viewer, not so much, but I'm behind times, so maybe Win10 could.

Here's the PNG version:

 

[r13]

Are you sure that you have the equipment/crane that can lift the liner by one piece? It is very tall and heavy.

 

[John188]

R13,
yes the crane can lift the liner by one piece

 

[r13]

I think the next step is investigate the crane operation range and permissible/available space to set up the lifting assembly, and operates safely, similar to the sketch below. Note that the optimal situation is having matching number of lifting points on both top and bottom of the lifting beam/ring. Then, what is the size of lifting cable required, and how many cables the crane hook can accommodate? All need to be looked into before you can think about the design of lifting beam/ring. I hope you can get help from someone experienced on this type of operation, so you won't waste time chasing the unrealistic solution.

At the meantime, you shall familiarize yourself with the standard for the design of lifting devices below hook, ASME BTH-1.

 

[goutam_freelance]

If it is a stack liner will it be inserted inside an already constructed chimney shell? Then you need about 250 m lift crane. A really tall order !

Engineers, think what we have done to the environment !

https://www.linkedin.com/in/goutam-das-59743b30/

 

[John188]

Thank you very much for the reply. I am actually interested to calculate the tubular steel section which need to be assembled in the liner top such that it can sustain 100T load while lifting. I am confused of how to model it.

 

[dold]

If it is a stack liner will it be inserted inside an already constructed chimney shell? Then you need about 250 m lift crane. A really tall order !

In my line of work we like to call in the sky-hook.

But seriously, you would need quite literally the tallest crane ever assembled. Send pics, OP.

As for the lug, why not weld on vertically oriented ribs so as to put the welds primarily in shear, as opposed to some ring as you show?