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Buildings with Magnets?

03/14/2018 1:00 PM

It is relatively easy to slide two magnets apart,but hard to pull them straight apart.

So why can't this principle be used to create earthquake resistant buildings?

Imagine that the "mortar" is impeded with alternating polarities of magnets,perhaps on the molecular level.

This could be done on site by embedding the mortar with particles that could be magnetized by external electromagnetic fields,and polarized as they are laid.

Refreshing wires could be embedded in the "mortar",or they could be refreshed externally by a portable unit.Perhaps the embedded wires could be used alone to generate the magnetic fields if the building blocks were properly designed.

They could also be strengthened by an external magnetic field that would be used when an earthquake was eminent.

They would accommodate lateral movement,but resist vertical movement to a much greater degree.This would allow flexing and if the mortar is properly designed,the building would settle back to it's previous shape.

I would welcome all constructive input on this idea.

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#1

Re: Buildings with Magnets?

03/14/2018 1:19 PM

I like the idea of building with magnets. How much fun would it be if you could reverse the poles on half of them?

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#2

Re: Buildings with Magnets?

03/14/2018 2:23 PM

Rubber and steel are cheaper materials to use to build building shock absorbers. Magnets use expensive materials and have additional design challenges.

The problem preventing widespread use of building shock absorbers isn't the design, it's the cost of including or adding them to buildings.

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#3

Re: Buildings with Magnets?

03/14/2018 2:42 PM

Or this could happen if you're carrying to many magnetic items in your pockets!

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#8
In reply to #3

Re: Buildings with Magnets?

03/15/2018 10:05 AM

Yeh! I just wonder how that would effect cellphones,etc.

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#4

Re: Buildings with Magnets?

03/14/2018 4:20 PM

You could build a geodesic dome easy enough....I'm thinking it would be expensive and lacking in strength....

What about a suspended building?

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#5

Re: Buildings with Magnets?

03/14/2018 5:11 PM

Some of the active damping systems might be a bit similar but overall it sounds expensive and problematic.

An alternative to magnets that is more similar than you might initially think was shown on TV a few years ago. A building could be built supported by pilings as shown below. Below each piling is basically a very sloppy ball and socket "joint". The "socket" part would be so sloppy that it basically makes a dish or bowl for the building piling to rest in. When an earthquake strikes the mass of the building does a little "body at rest tends to stay at rest" and slides in the bowl. The upward slope of the sides of the bowl will tend to cause the building to center itself over time. Basically a mechanical low pass filter is built. The building will still move in the earthquake but the frequency and g-loading will both be lower.

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#12
In reply to #5

Re: Buildings with Magnets?

03/16/2018 1:26 PM

Such specialty applications, such as structural vibration isolation, dampening, etc., have been around for quite a while now. The issue is how to get the structure to mitigate the impacts of all manner of (externally sourced vibrations) down to an acceptible level of structural damage that can be affordably repaired...

That is a matter of making the structure flexible enough to aborb such vibrations that would be too expensive to make rigid enough to simply resist such vibrations...

Building design techniques, materials, analysis, etc., are getting better, but they are not all the way ''there'' yet...

The above approach would pop-out the ground floor walls on at least two oppositite sides of any multistory structure, at the bare minimum, for lack of flexibility...

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#6

Re: Buildings with Magnets?

03/14/2018 6:21 PM

Two connected magnets produce a force that opposes tension. Under a building, you have high compressive forces, not tension. So magnetized "bricks" would not act any different than regular bricks except that the force holding a brick against the brick underneath would be slightly stronger.

I expect the loading force of the building weight would dwarf the magnetic forces. The resistance to shear would be the coefficient of friction times the normal force (weight) on the sliding surface. In short, it would not slide easily if it would slide at all.

What you need is something that moves horizontally without much force but can withstand the huge compressive forces from the weight of the building. A practical design would have to incorporate some kind of rollers, the same principle employed in bearings.

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#7

Re: Buildings with Magnets?

03/15/2018 2:00 AM

Making EM waves are easy. But, directing and maneuvering the EM Flux might be a difficult job.

Like how do you predict where the collision trajectory N-N magnets goes in 3D, Or can you concentrate it like photons on a lens or could you separate shares/portions of the flux with precision?

Magneto only does that.

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#9

Re: Buildings with Magnets?

03/15/2018 12:11 PM

Theoretically, you could stack bar magnets, (positive) end to (negative) end, like sections of a segmented fishing pole, that would be quite strong in axial tension and axial flexure...

However, for a sharp earthquake, at the base of such a structure like that, then relatively little resistance would be offered to one bar magnet just sliding off the top end of the bar magnet end immediately beneath it, at the ground level...

Also, such a structure would tend to snap, just like a buggy whip, and violently toss the (contents) back and forth at the top of such a structure...

And, if a standard H-column could be permanently magnetized, in-place, then exactly how much would that actually cost?... Certainly more than standard construction costs...

And, assuming the beams and girders did not also have to be magnetised as well, what kind of long-term consequence(s) would be (imparted) to people trying to do what kind(s) of work that close to magnetic fields...

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#10

Re: Buildings with Magnets?

03/15/2018 10:19 PM

I'm sure you have realized that buildings and the materials they are made of occasionally get torn down and recycled and that isn't exactly a catch all process. So now comes the potential of having unknown trillions of magnetically charged particles floating willy nilly everywhere in the air, water and soil.

Like the migrating pcb's, abrasive particles in face scrub and untold pieces of plastic floating in the oceans wasn't enough.

Maybe this should be filed under : Ideas that sounded good at first but not so much after I thought about it.

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#11

Re: Buildings with Magnets?

03/16/2018 12:25 PM

Just as a matter of curiosity, about how much in the way of (iron filings) could be (magnetically mined) from a typical cubic yard of beach sand?... from yard dirt?... from farm land?... etc.?...

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#13
In reply to #11

Re: Buildings with Magnets?

03/17/2018 6:39 AM

This might be helpful.

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#14

Re: Buildings with Magnets?

03/17/2018 12:22 PM

Electromagnets could be applied at the corners of buildings, but would be no good if an earthquake downed a power pole. But may be good for buildings that have a backup power system. Keeping the corners from toppling may be needed most to prevent the walls from getting damaged. The electromagnets would turn on when an earthquake is forecast or when a circuit detects vibrations.

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#15
In reply to #14

Re: Buildings with Magnets?

03/19/2018 12:20 PM

There may indeed be some applicability to such a concept of electromagnetism being actuated by transient vibrations of magnitudes larger than (background noise level)-vibrations, as detected by vibration sensors powered by auxilliary power supply source(s) that would not turn it/them-self/selves off too soon...

Better solutions would include some combination of more appropriately flexible joints, diagonal tension spring barcing, and/or guided structural member connections, etc., coupled with existing vibration dissipation technology...

GA from me...

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