Which floor of a traditional building is the safest in an earthquake?


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2022-11-08

Which floor of a traditional building is the safest in an earthquake?

Some people say it is a low floor. The reason given is that it is easy to escape because the floor is low. Is that true? (In a real earthquake, you may be sleeping, or the earthquake makes people "drunk" and can't run.) The answer is, of course, wrong! The above figure below shows that when the Taiwan Hualian earthquake occurred, the strong earthquake caused the damage to the columns on the first and second floors of the hotel near the park road. The building collapsed instantly, and the third floor became the first floor. The tenants on the fifth floor were stunned.

 

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饭店震后实拍图

 

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饭店震后实拍图

 

 

 

房客由救援人员协助从窗口逃生

 

 

The tenants' unsettled feelings

 

 

Columns of low floors were broken in the Wenchuan earthquake

 

 

Columns of low floors were broken in the Wenchuan earthquake

Why does this happen? The reason is that the horizontal shear wave is the most harmful to the buildings in the earthquake. Because of the traditional earthquake resistant mode of hard hitting buildings, many load-bearing columns are "sheared" under inertia, and the second floor becomes the first floor.
Some people say that it is the highest level, and the reason is the above reverse thinking. Is it true?
The answer is, of course, wrong! The above figure below

 

 

As the building will have the effect of shaking and magnifying upward, if you live on the top floor of a 33 storey building, the microwave oven and other objects in your home will be several times faster than those in low floors during the earthquake“ Greeting” On your face and head, the probability of injury is very high. In an earthquake, the main structure of traditional buildings is often strong enough, but non structural members, equipment, pipelines and people are often; Buy a casket and return a bead” Yes

So we need to promote the technology of earthquake reduction and isolation. In earthquake reduction and isolation buildings, especially isolation buildings can isolate about 80% of the earthquake energy. The seismic capacity is 8-10 times that of traditional buildings. You can rest easy. The above figure below

In the 311-9.0 earthquake in Japan (the fifth largest earthquake recorded by human beings, and the first was the 9.5 earthquake in Chile), chopsticks and wine bottles did not fall from the top floor of a high-rise isolation apartment in Sendai. The engineer recorded the displacement of about 60cm in the isolation layer through mechanical displacement equipment. The whole building overcame the rigid by flexibility during the earthquake, which turned the destructive shaking of the building caused by the earthquake into a slow translation

The same scene happened in the project of Zhen'an Technology. Remember the promotion of Zhen'an Technology's Invisible Angel? The title/tail of the film took the real case of Tonghai earthquake in Yunnan in August 2018 as the prototype for restoration shooting, which truly restored the performance of the new earthquake isolated girls' dormitory building and the traditional earthquake resistant boys' dormitory building built earlier in the school in the earthquake, and shared the strong contrast between boys and girls on the earthquake

The monitoring video of the isolation layer of a project in the earthquake of the Dali Yangbi M6.4 earthquake shows that the isolation bearing performed well during the earthquake, and recovered to perfect immediately after the earthquake; Standby” Working status

After the earthquake, the residents of a traditional building in a community have openly expressed their admiration for the residents of the isolation building because of the cracks in their own decoration

At this time, someone thinks:“ Lie flat”! How can there be so many shock-absorbing and isolation buildings? When a big earthquake comes, they can't run, and when a small earthquake comes, they don't have to run. This is an extremely wrong and irresponsible statement

When an earthquake comes, there are also emergency tips in traditional buildings to avoid casualties to the greatest extent, as follows:

The third link is generally called“ Steady”, However, I don't think these two words can vividly reflect the situation that the evacuees cling to the bunkers and shake them together in the earthquake, so they changed it into a "one by one" one; Set” Word

If the disabled person is in a wheelchair, the first step is changed to" Fixed - LOCK", First fix the wheelchair and other links

Say so much! Have you got GET yet

Keywords: pipe supports and hangers, hydraulic dampers, in-service inspection and maintenance, equipment vibration control, isolation, energy dissipation and shock absorption, electromechanical earthquake resistance