arched beam 6

[saad73joss]

Hello everybody

I have a case I would like you to help me by giving me ideas of the best way to build or erect this beam (see picture attached).
It s a warehouse composed by those beams with 6 m distance between 2 beams and covered by a metal cladding supported on steel beams or precast light slabS.

Has anybody did a similar project.

My questions are:

( most important question)- WHAT IS THE BEST WAY AND ECONOMICAL WAY TO BUILD THOSE BEAMS ( in total we have a length of 240 m which means 41 arched beam)
( secondary question ) - The calculation of the interface between fondation and this arched beam ( Freyssinet articulation ) ( see picture)


Many many thanks and sorry for my english

 

[ztengguy]

I would precast them on the ground and erect and have a joint somehow at the top.

 

[saad73joss]

Hello dear Tengguy
sure
I thought about it
How would you erect the beam? by a crane. With this conception it will involve 2 cranes for each part. May be if we put a vertical scaffolding in the middle to support the half beam !!
Have you done this before ?
many thanks

 

[MikeHalloran]

It looks like something you would precast on site and erect like a 'tilt-up'.
... but I can't make sense of the Freyssinet joint detail.


Mike Halloran
Pembroke Pines, FL, USA

 

[IDS]

I'd also suggest precast adjacent to the site. You probably could come up with a tilt-up arrangement that would work, but it might be easier to have a precast form or forms at a convenient location and transport to the final location. You might also consider using vertical forms (i.e. cast the arches on their side) and rotating at the time of erection.

Erection with a single crane and a central scaffold support is a possibility, but that's a huge arch so you'll need to be very careful with all your details. Check deflections under self weight carefully, with generous allowances for creep, shrinkage and differential temperature effects, epescially if you are lifting when the concrete is young (but precasting and storing for a least a month would avoid putting young concrete under final load conditions)

What are you proposing at the crown? A pin joint is probably the way to go.

Good luck!

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[chicopee]

I would use two cranes.

 

[chicopee]

and a manlift

 

[ishvaaag]

I also would suggest to forfeit the "Freyssinet" pinned connection. It is not only inadequate to precast parts, but there have been some structural failures related to them as well.

 

[koohi]

Construction of such arched frame with this span and height with concrete is an unusual case and such frames be designed usually with steel. But if it's necessary use from concrete frame I think it's better divide each frame to at list four part with steel end plate connections in precast concrete factory and erected each part in site.

 

[saad73joss]

Hello gents
I m working on solutions and i will write you very soon what is the conception selected.
I really thank you guys