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How People Made a City in the Sky


Throughout its history, humanity has constructed several structures. The Great Wall of China, the Colosseum in Rome, and even the Pyramid in Egypt are just a few examples. The Burj Khalifa in Dubai, on the other hand, is one of the most astounding structures that modern humanity has created. It has a height of 2717 feet, 163 stories, and cost more than $1.5 billion to construct. There is a hotel, a residential area, a restaurant, a shopping center, an office, a gym, and other amenities. This tower provides everything a person could ever require. That is why many often refer to it as a vertical city. It is now the world's tallest tower and the most complex engineering feat ever created. Some may then raise objections. What would one do to keep it from collapsing?


Wind, not earthquakes, is the most significant vulnerability of such structures. Buildings or skyscrapers have an oscillation cycle that tells when the structure are the most fragile and shaken. Architects call this a building's natural period, and the length of the natural period grows with the height of the structure. According to the natural period, the taller the structure is, the more it shakes. The natural period of a structure is generally 0.02~0.03 of its height. For example, if a structure is 100 meters tall, it will shake once every 2~3 seconds. If a structure is 1000 meters tall, it will shake once every 20 to 30 seconds. The natural period of an earthquake, on the other hand, is generally 0.5~2 seconds. As a result, a towering structure, such as a skyscraper is generally safe during an earthquake. Wind, on the other hand, is not the same as earthquakes. When wind flows through a structure, a stream known as a vertex occurs. The vortex is relatively consistent, and the continual and recurring winds cause structures to tremble more and more. As the vortex intensifies, the structure begins to sway and finally fall. This circumstance is because the force sharply increases when an object with a unique natural period faces a vortex or a force with a similar or identical oscillation cycle. The resonance phenomenon is another name for this phenomenon. The most critical task for architects and construction businesses is to reduce or eliminate this shaking as much as possible.


To prevent tremors and collapse, architects commonly employ two methods: a damper and a tapering upwards. Architects can fulfill the building's design while reducing the wind's influence by tapering a structure. Higher elevations see more wind than lower altitudes, and the force is related to the speed square. The shaking reduces when the wind influences less area. Also typical is the use of a damper. A damper is a device that reduces vibrations in a structure. A damper is often a sizeable heavy ball or a weight in a structure. When the structure sways, the weight shifts in the opposite direction, canceling the vibration. On the 90th level of one of the city's tallest buildings, the Taipei 101, is a massive damper known as the TMD or Turned Mass Damper. These two methods are the most effective and widely used for skyscraper maintenance. Burj Khalifa can withstand a 6.0 magnitude earthquake and winds of 55 meters per second thanks to various solutions and intricate engineering.


So this answers the question of how engineers made it possible to build a city in the sky. Engineers were able to sustain such structures to the present day by knowing their flaws. We may see taller and safer structures as technology improves and more effective ways for building skyscrapers emerge. Skyscrapers may appear to be attractive. However, these attractive structures result from a great deal of engineering.

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