Typhoon "Fireworks" has weakened to a strong tropical storm at 9 o'clock in the morning of the 26th, and it is expected to return to the ocean again after a turn in China.
Although the typhoon "fireworks" level has weakened, but the wind is still very strong, according to the Central Meteorological Observatory forecast, "fireworks" will bring high winds to Shanghai, eastern Zhejiang, northern Fujian, northern Taiwan Strait, southern coastal Shandong Peninsula, Hangzhou Bay and other places, the wind is about 6-8, of which the wind in some areas is 9-10, gusts are 11.
For skyscrapers, windy weather may cause the building to shake, and continuous shaking will cause the structure of the building to be damaged, resulting in a great reduction in safety.
So the question is, the Shanghai Tower is 632 meters high, and it is just within the range of Typhoon "Fireworks", so how can it withstand the winds of up to 10 degrees?
<h1 class="pgc-h-arrow-right" data-track="5" > Shanghai Tower</h1>
Located in the Lujiazui Financial and Trade Zone of Pudong New Area, Shanghai, Shanghai Tower has a height of 632 meters, 128 floors above ground and 5 floors underground, making it the second tallest skyscraper in the world and the tallest skyscraper in China. For skyscrapers, wind resistance is a very difficult thing.
Because high-rise buildings are subjected to greater winds than ordinary buildings, especially buildings with a height of more than 500 meters, the strength is 2 to 3 degrees higher than the ground. This can easily cause the building to shake. If it encounters super strong winds or typhoons, the theoretical swing amplitude of the Shanghai Tower will be very large, even more than 1 meter. If there were people in the Shanghai Tower at this time, the people inside would definitely be dizzy.
So the question is, this typhoon "fireworks" is menacing, can the Shanghai Tower withstand the typhoon "fireworks"?
In fact, when designing the Shanghai Tower, a lot of schemes have been made to reduce the wind load and improve the wind resistance, which can be said to be armed from the foundation to the roof, not only that, the Shanghai Tower also has a unique world-class wind and earthquake resistance secret: Shanghai Wise Eye.
Generally speaking, high-rise buildings are designed with wind and earthquake resistance in mind, and the Shanghai Tower is certainly no exception, we give two examples:
Super solid foundation: Shanghai belongs to the alluvial plain, which is constantly deposited by the sediment carried into the sea by the Yangtze River, which is still a matter of thousands of years. As a result, Shanghai's soil is very soft, and it is very difficult to build skyscrapers here. However, the method adopted by the engineers this time is also very unique, they put several tens of meters long piles directly into the soil layer, and then, they poured a base plate on top of these piles, which covers an area of more than 10,000 square meters, equivalent to the size of 1.6 standard football fields, and the thickness reaches 6 meters, which is the largest building floor in the world. Finally, they added another layer of rafts to this baseplate, which made the foundation of the Shanghai Tower very strong.
Exteriors that reduce wind loads: When designing the façade of the Shanghai Tower, the designers also took into account the impact of wind on the building. Therefore, the "rounded triangle" façade scheme is used, which can reduce the wind load by 24%.
In addition to the foundation and façade, the main structure of shanghai tower adopts the method of "giant frame with core tube and outstretched arm truss"; while the outer curtain wall adopts a support system of "hanging structure, radial pole and horizontal oblique support", with retractable supports. These designs can greatly reduce the impact of wind on the building, while also reducing the deformation of the building structure.
Although these designs are clever, they do greatly reduce the impact of wind on buildings. But what ensures that the Shanghai Tower, even in the face of typhoons and earthquakes, is something else, and its technical term is called dampers.
<h1 class="pgc-h-arrow-right" data-track="15" > Shanghai Huiyan</h1>
Some time ago, the overall height of Shenzhen SEG Building was 355.8 meters, and there was an abnormal swing. Later, after the investigation of the experts, it was found that the Shenzhen SEG Building was not equipped with a damper, and the mast connection point on the roof was damaged, so there was a swing.
In other words, dampers can play a very important role in skyscrapers. The principle of damper is:
Mechanical or hydraulic devices that use damping properties to absorb or suppress impulses to slow down mechanical vibrations and consume kinetic energy.
A pendulum eddy-current tuned mass damper was installed on the 125th floor of the Shanghai Tower. This damper is mainly composed of the main structure protection system, damping system, sling and mass block, and the weight reaches 1000 tons.
When a typhoon or earthquake comes, the damper will start, and the sling and mass block will form a giant swing, and the swing will provide a reverse swing to hedge the swing of the Shanghai Tower, so that the building can be flattened and standing, thus achieving the effect of wind and earthquake resistance.
This set of dampers in Shanghai Tower is also known as Shanghai Huiyan, which is also the largest damper in the world, and the introduction of electromagnetic principles is the first. When the typhoon "fireworks" struck, Shanghai's eyes moved to help the Shanghai Tower resist the typhoon.
#上海中心大厦如何抵御 "Fireworks" Impact ##"Fireworks" landed again in Pinghu, Zhejiang #