What kind of failure it will be? St 13

[Myo Maung]

What kind of failure it will be? Strength or stability failure? See video from below link

https://m.facebook.com/100002428130472/posts/2949250191832556/?d=n

 

[r13]

Don't looks like hollow core or double tee either, but not steel framing though.

 

[human909]

So a big stack of pinned members which performed as expected.

Best explanation here. The structured performed as you would expect. There really isn't much else to it. Beyond speculating on what ISN'T there.

The floor system is the 'formwork' here. Cannot tell what type of floor it is though. But it isn't uncommon in precast (double tees, flat slabs) and composite steel deck floors to not require any falsework or propping.

Excactly.

The half dozen posts claiming formwork have just left me scratching my head in confusion.

 

[Tomfh]

Stability. Pin ended columns fell over.

 

[r13]

If this is an conventional RC structure, too early to impose localized live load will lead to failure like this. For precast concrete structure, for all pinned condition, what is there to provide stability? My hair almost gone.

 

[r13]

Image below captures the failing structure just second before collapse. Note the dish shaped floor slabs.

 

[Agent666]

I'd say that's a few seconds into the collapse initiating and we'll beyond the point of no return... Static equilibrium. It did not collapse because of anything to do with the floors in my opinion.

The stopping and starting of the columns probably with pin like end connections, combined with a possible lack of rotational restraint to the beams in this configuration causing the beams to role over appears to be the nail in the coffin, causing the whole thing to rapidly lose stability.

I thought it was fairly obvious it's a steel structure. You can even see the columns are an I-Section shape if you look at the floor. The cross sectional dimensions are non-sensical if it was in fact a concrete structure.

 

[r13]

Maybe limited by the angle, couldn't see beam though.

 

[vhengr]

What power shovel is doing there?
Is there any soil settlement-like situation occurred before starting a collapse; in front left side column area? so the lateral loads introduced into the frame and bow in floor can be seen there.

and obviously as (Agent666) mentioned , "So a big stack of pinned members which performed as expected" is true.

Cheers! -VH

 

[verymadmac]

There is two post collapse videos

https://www.facebook.com/yangzu.peng/videos/2949247355166173/

this one shows some decking

https://www.facebook.com/yangzu.peng/videos/2949247235166185/?t=4