Data Center / Edge Seismic Solutions
The focus of precautions to be taken to be prepared for an earthquake is human safety. However, in order to ensure that emergency activities, and then life and the economy are carried out healthily after an earthquake, the continuity of operation of the installations that constitute the technical infrastructures must be protected.
Seismic protection is of vital importance for earthquake safety of electronic and mechanical systems in structures that will be used first, such as hospitals, communication centers, data centers, and power generation centers, especially after a strong ground motion.
A data center should be considered as one of the most valuable buildings today due to the data it contains, the value of which can never be measured with material value. Therefore, seismic resistance should be sought starting with the building itself and up to the active devices within it.
In summary, determining the risk and scale of seismic activity should be included as part of the general assessment approach that evaluates the risks and events that potentially affect the data center. After determining the risk and scale of seismic activity, appropriate mitigation measures should be taken.
Table 1- PGA ve SIS
|
PGA ms2 | 0,25 - 0,80 | 0,80 - 1,40 | 1,40 - 2,50 | 2,50 - 3,15 | 3,15 - 4,00 | >4,00 m/s2 |
Mercalli SIS | V - VII | V - VIII | VI - IX | VII - X | IX - X | X-XII |
Japanesse SIS shindo | 4 (3,5 - 3,9) | (4,0 - 4,4) | 5 5 bottom | 5 top | 4,5 - 4,9 (bottom) 5,0 - 5,4 (top) | 6 6 bottom | 6 top | 5,5 - 6,0 (bottom) 6,0 - 6,4 (top) | 7 >6,5 |
An SIS is associated with the type of potential damage.
* PGA : the maximum ground acceleration resulting from an earthquake shaking at a location
** SIS : Seismic intensity scales
Precautions to be taken in data centers;
Precautions must be evaluated separately for each product group. Making the building seismically resistant or having a raised floor that is seismic does not mean that the cabinets, panels or other systems positioned on it are not risky. A data center is a whole consisting of multiple disciplines and systems. A malfunction in any system will cause the connection between the systems to be disrupted and therefore the integrity to be disrupted. In short, it is very important to take precautions at every point
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Seismic certifications are given on a product basis and are tested to see if they fulfill the purpose for which they were designed.
In buildings; It is necessary to start from the facility building as a basis. Today, damper systems and isolaters are used quite frequently in critical facilities. The aim is to absorb the earthquake energy coming from the ground and ensure that it is transferred to the building at a minimum level. Of course, this does not mean that it will completely absorb the effect of the earthquake.
The roads that provide connection between the areas of data centers (including power, gas, fuel, water, sewage, environmental control and telecommunications) should be designed to withstand the anticipated seismic risk.
Non-structural products; include products that are not included in the building such as panels, UPSs, cabinets, generators. Although each product range has its own seismic connection method, standard and test procedure, the following solutions are generally applied.
The use of vibration isolators to fix the cabinets and shelves to the ground concrete is not sufficient in terms of earthquake resistance. Vibration isolators are generally used to limit the vibration-producing devices, such as air conditioning equipment or generators that have motors running on them, from transmitting the vibration they produce to the concrete on which they are fixed, and they are designed for this purpose. The function of vibration damping and earthquake resistance requires separate features.
Sliding earthquake platforms enable the kinetic energy generated during an earthquake to be converted into potential energy by moving the metal spheres in their bodies on the horizontal axis and raising the mass on the platform on the vertical axis during this movement. The points to be considered in their use are stated below.
In order for the sliding platform to slide on the horizontal axis, its surroundings must be left empty. This situation creates difficulties in the use of components fixed to the building, such as sliding doors, especially in data center hot/cold corridor applications.
In order for the sliding platform to work properly, the device positioned on it must be able to move almost freely. For this reason, the cables entering the devices must be of a length and flexibility that will not impede movement. This also restricts the working area and means additional load.
In the direct fixing method to the ground concrete, the first important headings in terms of earthquake safety are the concrete quality and the anchor bolt itself and the method of holding it to the concrete. The hole diameter at the connection point is very important and if the hole is larger than necessary, the accelerated mass cuts the bolts with the impact effect. Therefore, it is important to use seismic certified products and to follow the application recommendations of the manufacturers.
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