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Happy Tycoon - Chapter 1026

Published at 29th of September 2021 01:23:52 PM


Chapter 1026: 1026

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Adrian looked in the box he carried with him, then took out a rolled up drawing and handed it to Yang Jing, "This is the overall effect drawing of the building I designed at that time. What do you think? Actually, when I handed this design to Prince alwalid, I was reluctant to give up, because the overall style of the building I designed is not very suitable for the folk customs in Saudi Arabia, but more suitable for you in China. You know, I once set up in China I have planned two super high-rise buildings, one is Jinmao building, the other is Zifeng building, so I am full of good feelings for this country, and this design scheme is more in line with the traditional style of China. "

Yang Jing opened the rendering and was immediately attracted by the building drawn above.

The aerial view of the building is a slightly deformed five pointed star pattern, not a regular five pointed star, but some changes. As for the front effect, it is a spire like a triangular pyramid. The lower part of the building is the largest, but the building continues to shrink with the increase of height. Up to the top, it shrinks into a spire.

As a whole, it seems that a three edged army thorn has been erected on the ground, stabbing directly into the sky.

"Hehe, you can see that the building was originally named the five-star tower, because the overall structure of the building presents a five-star pattern, and the five-star is also of special significance to China. At the same time, the building can also be called the five element tower, gold, wood, water, fire and earth. In your ancient civilization inheritance of China, the five elements are also the most important The five corners of this building represent the mysterious five elements. "

"Well, good, quite good! I like this design very much. But where did you get your inspiration, ad?"

"Hehe, it's a bit of a coincidence. I have a little grandson. He is 17 years old. When he was five years old more than ten years ago, he was playing with a paper ball. The paper ball is composed of several regular triangular cubes, that is, a toy called five intersecting tetrahedron."

Yang Jing nodded. He had seen this kind of origami toy, a very magical toy.

"Because every face of this five intersecting tetrahedron will show a five pointed star shape, my inspiration suddenly came, so I designed this five-star tower according to the principle of this five intersecting tetrahedron."

After a pause, Adrian continued to explain: "we all know that triangles are the most stable structure, so many main structures in super high-rise buildings use triangles. The overall structure of the five-star tower is composed of five triangles, so structurally speaking, the five-star tower has a very stable structure."

"Well, in fact, the architectural concept of the Khalifa tower I designed before is' the flower of the desert ', and the plane is a three petal flower in full bloom symmetrically; the facade forms a spiral line through 21 gradually rising retreats, and the whole building is like a flower in bud. The core idea of this design is actually an equilateral triangle structure. And the Kingdom tower I designed is the same It comes from the design idea of regular triangle structure. In order to build a super high-rise building, the first thing to ensure is that the core structure of the building must have sufficient stability, and triangle is undoubtedly the best choice. "

Yang Jing nodded and said, "ad, your design concept is very correct. Stability is the first thing for this super high-rise building."

Adrian smiled and said, "yes, so in my design, almost none of the buildings adopt steel structure. The buildings I designed are mainly steel-concrete, and then the part on the top floor adopts all steel structure."

"Eh, what building materials can affect the stability of the building?" Yang Jing asked puzzled.

"That's nature! The choice of building materials plays a crucial and decisive role in the stability of the building! Albert, you should know that one of the most feared things of this kind of super high-rise building is earthquake, and the other is strong wind. It's hard to say about earthquake. Generally speaking, the site selection of super high-rise building will be in the area with relatively stable geological conditions to maximize To avoid the impact of earthquake on the building. But there is no way to avoid strong wind. When designing every super high-rise building with a height of more than 400 meters, the first consideration is the impact of wind on the building. Because the higher the building, the stronger the wind on its upper part, and the greater the displacement of the building. This is in direct proportion and can not be avoided. "

"However, if different building materials are used, the impact of wind on buildings can be minimized. In the 1960s and 1970s, there was a general consensus in the global construction industry that" all steel structure is superior to concrete structure and suitable for super high-rise buildings ". Therefore, a large number of steel structure high-rise buildings more than 300 meters were built during that period, such as those built in 1971 The height of the twin towers of the world trade center in New York has reached 412 meters, and the Sears building in Chicago built in 1974 has reached 442 meters. "

"Well, I know. It seems that all steel structure is not good for fire prevention. The twin towers of the world trade center collapsed in the 9 / 11 incident was because the fire melted the steel structure of the building, which eventually led to the collapse of the twin towers," Yang Jing said.

"Yes, although the steel structure reduces the overall weight of the building, as you said, the super high-rise building with all steel structure is a very unfavorable factor for fire prevention. If the twin towers of the world trade center are made of concrete, maybe the twin towers will not eventually collapse," Adrian nodded.

"Moreover, there is an unavoidable situation for super high-rise buildings with all steel structure, that is, the displacement of high-rise buildings is too large. In the 1980s and 1990s, it was found that all steel structure can no longer meet the requirements for the further increase of building height. The reason is that the increase of lateral stiffness of steel structure is difficult to keep up with the rapid increase of height. In other words, it is this all steel structure In the upper part of the super high-rise building, because of the wind, the displacement is much greater than that of the concrete structure. "

"This can be clearly seen from the comparison between the Khalifa tower I designed and the twin towers of the world trade center. The Khalifa tower I designed adopts a new structural system of lower concrete structure and upper steel structure. The reinforced concrete shear wall system is from 30m underground to 601m above the ground; the steel structure is from 601 to 828m, of which the steel frame with diagonal bracing is used from 601 to 760m."

"The world trade center in New York is an all steel structure, so the maximum displacement on one side of the two buildings at 412m is 1000mm; while the maximum displacement on one side of the concrete structure of Khalifa tower at 601m is only 450mm. Even from the perspective of Khalifa tower itself, the maximum displacement on one side is only 450mm at 601m to the top of the concrete structure, but it is only 450mm at 760m to the top of the steel frame The maximum lateral displacement increases rapidly to 1250 mm. At 828 meters from the top of the steel mast, the maximum unilateral displacement reaches 1450 mm. Therefore, the Khalifa tower arranges the hotel and apartment in the concrete structure below 601 meters, and the steel structure above 601 meters is used as an office building. The displacement above is too large to be suitable for people and only for office. "

Hearing this series of data, Yang Jing was surprised and said, "there is such a big gap between all steel structure and concrete structure?"

"Yes, the difference caused by the choice of these two building materials is so large!" Adrian said with certainty.

The so-called floor displacement refers to a common physical phenomenon of super high-rise buildings. Generally speaking, when the height of the building exceeds a certain limit, it will offset under the action of lateral stress, such as wind. This is an inevitable physical phenomenon. The higher the floor, the greater the displacement.

Generally speaking, displacement refers to the amplitude of horizontal shaking of the building on the left and right, and unilateral displacement refers to the amplitude of shaking of the building to one side.

The greater the displacement, the more unstable the building is. It's simple. It's shaking too much! If the displacement exceeds a certain limit, the building will shake more and more under the action of lateral stress, and finally collapse. Therefore, in the construction industry, there are strict regulations on the floor displacement coefficient of super high-rise buildings. If the model of super high-rise buildings can not pass the wind tunnel test, it is absolutely prohibited to build the building.

After the design scheme of a super high-rise skyscraper comes out, several models with different proportions will be made for testing. For example, the proportion of the overall model for testing rigidity and aeroelasticity is usually 500:1, while the model for testing local wind research is 250:1 or even 125:1.

This test model can intuitively reflect the influence of lateral stress on the building, so as to judge whether the design scheme of the building is qualified.

Adrian continued: "It is precisely because of the huge gap in displacement between all steel structure and concrete structure that reinforced concrete core tube and peripheral steel structure have become the basic form of super high-rise buildings since the 1980s and 1990s. This structural form is used in Jinmao Tower, Zifeng tower, Khalifa tower, Kingdom tower and Green Space Center under construction."

"I remember that the design standard of the Khalifa tower was designed according to the local once-in-50-year strong wind, that is, the standard of 55 m / s. as a result, during the wind tunnel test, the horizontal displacement of the model structure in front of the once-in-50-year strong wind, there was almost no difference between the displacement data and the maximum displacement data tested after the completion of the building. Therefore, I The design is absolutely qualified. Therefore, in the design of this five-star tower, I also adopted the same structural form as the Khalifa tower and the Kingdom tower. Although this design has not passed the wind tunnel test, I believe my design should meet the requirements. "

"Do you mean that the five-star tower or the dragon building will also adopt this structural form?" Yang Jing asked.

"Yes, this structure is the most suitable structure for ultra-high buildings at present. Well, I mean, this method is the best in terms of capital and ground pressure. Of course, it would be better if it could pass the wind tunnel test. Well, you just called the building I designed as the dragon building?"

"Oh, of course, because I will name this building after my company. Congratulations, ad, I adopted your design!"

PS: bow and thank the "very lazy fish" for the reward of 100.





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