All structures above ground are continuously exposed to earthquakes and other natural hazards, making seismic safety verification an essential requirement. In this example, we will learn how to verify the seismic integrity of a base station BBU communication server rack using the Response Spectrum Analysis method.
The topic we will cover today is the "seismic safety" of structures.
2016 Gyeongju Earthquake Accident Case
One of the things that must be considered when designing a product is a natural disaster called “earthquake.” But I have a lot of worries. “I’ve never felt it in my life, should I consider it?” “How can we guarantee earthquake-resistant safety?”
“Response spectrum load” is a conservative and simple quantification of the natural disaster phenomenon called “earthquake” so that we can understand it. It can vary depending on the number of floors of buildings installed in each country or region around the world, so it must be applied with caution.
All structures installed on the ground, including the communication server rack equipment that is the subject of this article, are exposed to natural disasters called “earthquakes.” In our daily lives, we may not have experienced much about natural disasters such as earthquakes. Some people may have never felt it in their entire lives. However, if a large-scale earthquake occurs, even one in one hundred or ten thousand, we will face numerous casualties and a very high risk.
Seismic hazard map
In general, buildings or structures installed for special purposes require earthquake-resistant safety verification because primary damage from an earthquake can result in direct destruction and secondary damage such as communication disruption and functional limitations can occur. In Korea, after the Gyeongju earthquake in 2016 and the Pohang earthquake in 2017, it was recognized as an earthquake-prone country, and high conditions similar to those for buildings that could cause casualties were strengthened and restricted to essential requirements for installation.
Earthquakes can generally be described as loads or vibrations whose acceleration changes rapidly over time. However, it is impossible to know when the data generated or measured can be representative of the region or whether something similar will happen next time. Therefore, generally, we collect decades of data, calculate only the maximum response for each cycle, create a response spectrum curve, and examine seismic safety through a simple and conservative “response spectrum analysis.”
Since seismic loads occur differently in each country around the world, in each region of the same country, and even on each installation floor in the same building, it is very important to understand and define the response spectrum load appropriate for the area where the product will actually be installed. Seismic safety cannot be proven if it does not meet the local requirements, so it must be applied with caution.
If so, let’s find out together how we can analyze and verify seismic safety. The example model is a base station BBU communication equipment installed inside a building, and it is a review of whether the structure has seismic stability by replicating the requirements of the seismic standards for domestic communication facilities announced by the National Radio Research Agency in accordance with higher-level laws.
midas NFX 2021 R1
Modal Analysis, Response Spectrum Analysis
Conducted a seismic safety review of communication server racks suitable for the domestic seismic environment in accordance with the “Technical Standards for Safety, Reliability and Communication Protocols of Broadcasting and Communication Equipment” of the National Radio Research Agency. In accordance with the domestic building structure standard “KDS 41 30: 2019”, a safety evaluation is conducted on the safety of structural members and major connecting bolts.