Toward the end, he suggests water dampers serve a dual purpose to meet fire codes (having a reservoir of water atop your building).
Does this create additional risk when firefighting operations draw it down?
i.e. Do the dampers contribute meaningfully to short term structural integrity of the building (particularly in gusty weather), or are they mainly just for comfort and materials longevity?
Has any building architected its liquid pool damper as a bonafide swimming pool?
xhkkffbf 204 days ago [-]
What are the odds that an earthquake could hit at the same time as a fire? What are the odds?
ASalazarMX 204 days ago [-]
An earthquake during a fire seems unlikely, but a fire caused by an earthquake seem more likely. At least the latter would happen after the earthquake.
The non liquid active tuned damper in Tapei 101 is a delight. Sprayed gold like a funky futurist nugget, set amongst massive hydraulic actuators.
I'm not sure you could make a liquid tuned damper be a tourist attraction.
mook 205 days ago [-]
I wonder if it would be possible to use it as an indoor swimming pool instead? People should get out when it starts damping least they get tossed around quite a bit, of course…
pishpash 205 days ago [-]
But they wouldn't get tossed around, that's the whole point? (Unless they are close to the pool boundary.)
chiph 205 days ago [-]
I don't recall him mentioning how the viscosity of the fluid changes it's effectiveness, but I imagine it would. For reduced maintenance costs (prevent algae growth) they probably use mineral oil, not blue water.
kllrnohj 205 days ago [-]
Surely some biocide or glycol or whatever is going to be a lot cheaper than using mineral oil? This is solidly north of a hundred thousand gallons after all, right? Especially since they're already going to have plumbed water in the building anyway, so they wouldn't need to transport drums and drums of whatever liquid is chosen if it's not water?
exmadscientist 205 days ago [-]
300-400 tons of mineral oil is not expensive on industrial scales. And biocides are not as effective as you'd hope (look up biofilms for one particularly annoying example). So mineral oil is definitely a viable option. But its lower density means that water is probably going to win anyway.
kllrnohj 205 days ago [-]
Quick search says around $1,600 USD per ton for mineral oil? Taipei 101's damper is 660 tons. No idea how that compares to a fluid damper, but if we assume similar tonnage requirements that'd work out to somewhere in the range of $1M USD in mineral oil. Granted that's, what, 0.05% of the building cost? So in that sense "not a lot", sure, but compared to the almost nothing that it'd cost for an equivalent amount of industrial water, that still affords a lot of alternative solutions. Especially since it just needs to slosh around, does it even matter if stuff grows in it? It's not like there's going to be sunlight, either, so there wouldn't be much growth regardless right?
bluGill 205 days ago [-]
They want something that isn't a fire hazzard. And water can be connetted to the fire control system thus serving an additional purpose.
giantg2 205 days ago [-]
Fill it with electro-ferric shock fluid
imglorp 205 days ago [-]
That's a great idea. The Action Labs guy just demonstrated how some of those fluids can vary their viscosity in response to a magnetic field, used in some vehicle active suspensions. Similar application!
Havoc 205 days ago [-]
Cool video. I love the practical attempts at demos. Even if they don’t always work 100% it’s so much better than talking plus some semi relevant animations
nosrepa 205 days ago [-]
Grady loves his models.
Rendered at 23:45:22 GMT+0000 (Coordinated Universal Time) with Vercel.
Does this create additional risk when firefighting operations draw it down?
i.e. Do the dampers contribute meaningfully to short term structural integrity of the building (particularly in gusty weather), or are they mainly just for comfort and materials longevity?
Has any building architected its liquid pool damper as a bonafide swimming pool?
I'm not sure you could make a liquid tuned damper be a tourist attraction.