You cannot install traditional isolators below tall buildings, which are already endowed by a high vibrational peiod. Viscous Dampers and/or TMD are more fit for purpose.
Yes you can, and the period is lower the taller the building is. And there are dampers installed at the ground level as part of the system. The dampers you're referring to are more for wind-induced loading.
@@HollywoodF1 You're incorrect, frequency is lower and period is longer when it comes to taller buildings (less stiffness). Also, I believe The Hyperlapser is right, I'm not sure how you could incorporate this into a tall structure without running into issues with overturning.
why don't you try two footing per coloumn' or three depending upon the height of the building? customarily when the building are constructed one footing are normally built, that is at the bottom of each foundation, now if if we add another footing between the bottom footing and the grade line, or between ground level and the footing below which in between or in the middle will surely add firm and reinforcement because of the soil will served as permanent lock around the two footings?
If it's a skyscraper shown in the video I don't believe there is a meterial dense and strong enough to support it for a long period without getting deformed. The principle and is good though.
If they put enough amount of 'that' thing, the pressure would be distributed hence making the weight of the building bearable to the material. but still dont think it would still be able to move and act as a 'stabilizer'. nice concept tho
@@zandwu2678 They can. In fact, they already have. Friction pendulum bearings (which these are a type of) have been installed and in service for decades and gone through earthquakes with flying colors. In fact, studies have suggested that in spite of the outrageously expensive regulatory burden put upon them, base isolation systems like these are probably more cost-effective over the long-term than standard "earthquake-proofing" practices.
@@randomkitty2555 The yield strength of 440C stainless steel, a high-performing but not prohibitively expensive alloy, can reach ~1900MPa (275,000psi). That means that in order to permanently deform a block of 440C requires about 50x the force necessary to crush a similarly sized block of typical concrete. In theory, that means that you'd only need enough pendulum bearings that their sliders could cover 1/50th of your foundation. In practice, you'd need even fewer than that, because concrete structures have to be made far stronger than steel ones in order to deal with concrete's brittleness.
Q1: Has this been tested in some type of laboratory environment (or is this just conceptual)? Q2: The video demonstrates lateral S (secondary) waves - - what about P (primary) waves? Primary waves produce a different type of earthquake. Nice work.
there are no benefits to use isolators for high buildings, it is better to use dampers, maybe viscous dambers. The fps is usable for building with non regularity. the limit of those devices is to non increas e the period of vibration more then 4sec, because thay cant recentrate anymore.
Thank you for your comment. The anti-seismic isolators are designed for high vertical concentrated load. As reference, the sliding material used has a compression resistance of 180 MPa which for a disc of 20 cm diameter means more than 500 ton (5’000 kN) resistance
Normally the life cycle of this isolators is around 60 years. For ease of replacement, the devices are installed using bolted connections. By using lifting devices (e.g. hydraulic jacks), it is possible to replace them by lifting few millimeters and unbolting the devices.
@@magebagroup That seems like very hard job, I think that there is not a lot of space under the building, and such a hydraulic tool weighs up to 500 kilos. Whether there is enough space below for some kind of forklift? Thank you for your answer and your time.
It looks suspiciously like a bearing cup from a double shear beam loadcell, on steroids! Trouble is, with the buildings, you have a lot of weight concerntrated in a very small area. As a result, you would need some serious hydraulic jacks to lift the building up a few millimetres to get the system changed. The only thing that worries me with this system is when the ground rises or falls. How does the system cope with vertical movement?
@@111jacare Thanks for your interest in our isolation system. Yes, we have hydraulic jacks that allow the replacement of anti-seismic isolators. The vertical component of the earthquake is also considered in the design of the device, in the respective NEd,max and NEd,min (as defined in EN 15129). In most cases the vertical component is not strong enough to create temporary gaps or shocks between the components of our isolators. While in structures where uplift forces are expected, uplift restraints are also foreseen
Thanks for contacting us. Our contact in Mexico: mageba México Prolongación Corregidora Norte, No. 1116 9PH, Colonia Arboledas, C.P. 76140, Santiago de Querétaro, México www.mageba.net/es/ We are looking forward to hearing from you.
Thank you for your comment. Regarding your question there is actually no upper limit in principle. To date we have built pendulum bearings with up to 120 MN maximum vertical load.
thanks for you comment. Please visit: www.mageba-group.com/tr/tr/ You can find contact details on the bottom of the website. Or use contact form: www.mageba-group.com/tr/tr/1068/all.htm
Ok, this a great ANIMATION- but not a a real thing, you can post again once your actual building is hit with an 8.0 magnitude earthquake let's see if it behaved like you animation.
Thanks a lot for your interest in our animation and your comment. It indeed shows the approximate behavior you can expect during a real earthquake of high magnitude 8.0 - 9.0 (Richter): the relative displacements showed are quite long (several meters at the top of the building) and the oscillation frequency around 0.5 - 1.0 [Hz]; The isolated building shows some bending though much lower than the non-isolated building.
