Steel Shutter for Concrete

[neilmark]

Can anybody point me in the direction of how to design a 15m diameter shutter from steel for a concrete pour. The shutter is going to be 3 rings of 152UC curved and bolted together and then 6mm infill plate. I can design the plate from lateral pressures but how does one quickly calculate the radial force in the UC's. The shutter is only 1.7m high with a ring of UC's on the ground, one at mid height and one at the top. The shutter is completely above ground level.

Regards

 

[msquared48]

I am unfamiliar with the term "shutter". Is this a concrete form?

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[neilmark]

Hi,

yes the shutter is the formwork for the concrete. Like a large steel mould I suppose.

 

[hokie66]

The UC members will just be subject to ring tension or ring compression, depending on whether inside or outside. Find the unit force at each level from the concrete pressure, then the ring tension is half the total force to each side. Using the unit weight of concrete as 2400 kg/m^3, I get the unit force on the centre ring to be about 17 kN/m, so the ring tension on that UC would be about 130 kN, unfactored and considering the concrete is still fluid and in pressure terms is basically hydrostatic.