Is it even possible to save a building once the main supports start buckling like that?

Transferring the load from a fractured column to temporary steel is less about jacking the building back to its original height and more about creating a **secondary load path** so the damaged section can be stabilized. On a commercial scale, you aren't usally trying to lift twenty floors of concrete back up to a perfect level. You're just trying to arrest the movement. Engineers use hydraulic jacks to take the slack out of the shoring towers until the pressure gauges hit a calculated number that matches the dead load of that specific floor area. Once that weight is transferred to the steel tubes and beams, that fractured column technically isn't doing the heavy lifting anymore.

Replacing the column is a grueling process. You have to chip out the old concrete, expose the rebar, and tie into the existing cage with mechanical couplers or heavy-duty lap splices. Then you're looking at high-strength, non-shrink grout or specialized concrete mixes pumped in under pressure. But even with the best shoring, you’re dealing with **latent stresses** in the rest of the frame. When one column fails, the beams connected to it start acting in ways they weren't designed for, often putting massive tension on the top steel where there shoud be compression. Most of the time, those steel posts are just there to keep the building from unzipping while the structural team figures out if it's even worth the liability to fix. If the original plan was to add more stories, that's almost certainly off the table now. You can’t easily trust the integrity of the surrounding footings or slabs once they’ve been shock-loaded by a partial failure. The cost of the specialized labor and the astronomical insurance premiums for crews to work under those conditions usually makes a controlled demo the more logical move. I've seen emergency shoring on smaller masonry and timber jobs, but 20 stories of reinforced concrete is a diffrent beast entirely. You’re fighting wind loads and thermal expansion on top of the structural failure. If those columns blew because someone modified the floor plan without reinforcing the transfer beams, the whole building's structural logic is compromised. It's rarely just one spot; the stress travels trough the entire grid.

Reminds me of a mill job back in '78. We didn't have those fancy hydraulic gauges, just a stack of white oak cribbing and 50-ton screw jacks. You coud hear the building groan every time you turned the handle. Once the bones are shattered like that, you're just putting a band-aid on a gunshot wound. I've seen old-growth beams split under half that stress, and at least wood gives you a warning. With concrete, once that rebar loses its tension, the whole chemistry is shot. I wouldn't step foot under those steel tubes for any amount of money. It’s a goner.

I dealt with a rotted 6x6 post under a heavy three-story porch last summer. Even with four 20-ton bottle jacks and temporary 4x4 walls, the moment I cut the old post out, the floor above dropped an eighth of an inch. That tiny move threw every door out of plumb on two floors. If that happens on a 20-story concrete slab, you're never getting it back. Those steel tubes they're using are just there so the guys can clear out thier tools without dying. Once the rebar starts snapping like guitar strings, the building's a goner. I wouldn't step foot in there for any amount of money.