The Science of Skyscrapers
Know everything about them..!!!!
What are Skyscrapers?
How is a Skyscraper made?
Building Technology Behind Skyscrapers
When planning and constructing high-rise buildings, the aim is to create safe and livable rooms in very tall buildings; the buildings have to bear their weight, withstand wind and earthquakes, protect residents from fire, but also have to be easily accessible on the upper floors. Utilities and a comfortable climate for residents Most high-rise buildings have a steel frame that allows them to be built higher than typical reinforced concrete structural walls. Buildings are characterized by window areas created by the concept of a steel frame and a curtain wall; However, skyscrapers can also have curtain walls that mimic conventional walls and have a small window area. This is made possible by cheap energy from fossil fuels and industrially refined raw materials such as steel and concrete. The construction of the skyscraper was made possible by the construction of steel structures, which increased the brick and mortar construction of the late 19th work. The usable area for ever-larger supporting pillars is reduced. Tubular skyscraper structures have been used since 1960, reducing the use of materials (cheaper: Willis Tower uses a third less steel than the Empire State Building), but allows for greater height; allows fewer interior columns and thus creates more usable space . The elevators are characteristic of skyscrapers, a safety elevator with which passengers can be transported comfortably and safely to the upper floors option was to use a steel frame instead of stone or brick; Otherwise, the walls of the lower floors of a tall building would be too thick to be practical. Today’s leading elevator manufacturers are Otis, ThyssenKrupp, Schindler, and KONE. Advances in construction technology have caused skyscrapers to shrink in width and increase in height. Some of these new techniques include mass dampers to reduce vibration and oscillation and gaps to allow air to pass through, which reduces wind shear.
Basic design considerations
Good structural design is important for most construction projects, but especially important for high-rise buildings because, given the high price tag, the likelihood of catastrophic failure is small but unacceptable. For civil engineers, this is a paradox: the only way to ensure reliability is to test all failure modes in the laboratory and the real world, but the only way to understand all failure modes is to identify previously known failures. Thus, no engineer can be sure that a given structure will withstand all the stresses that could lead to failure, but they can only have a sufficiently large margin of safety to make failure acceptable due to some form of myopia or some unknown factor.
Loading and vibration
The stress in a skyscraper is in large part due to the strength of the building material itself. In most building designs, the weight of the structure is much greater than the weight of the material it supports beyond its weight., The load on the structure is much greater than the payload . The amount of building material in the lower levels of a skyscraper must be larger than the Empire State Building. Thus the shape results exclusively from the load-bearing capacity. Posts can come in a variety of designs, the most common of which is for skyscrapers. can be divided into steel frames, concrete cores, pipe-in-pipe construction, and wall shear walls.
By 1895, steel had replaced cast iron as a construction material for skyscrapers. Its malleability enabled a variety of shapes and rivets, which ensured firm connections . The simplicity of a steel frame eliminated the inefficient portion of a shear wall, the center portion, and load-bearing elements, which were consolidated in a much stronger way by allowing horizontal and vertical supports throughout. the distance between the support elements decreases, which in turn increases the amount of material to be supported. In buildings over 40 floors, this becomes inefficient and uneconomical because the usable area for the support column is reduced and the increased use of steel.
The elevator conundrum
The invention of the elevator is a prerequisite for the invention of high-rise buildings because most people can (or can) only climb a few stairs at a time. Elevators in high-rise buildings are not only necessary aids such as running water and electricity but are also closely related to the design of the entire building . Taller buildings need more elevators to reach more floors, but elevator shafts consume valuable living space.
Many high-rise buildings use non-standard elevators to reduce space requirements. Buildings like the former World Trade Center Tower and the John Hancock Center in Chicago use elevated lobbies where express elevators take passengers to higher floors and serve as a base for local elevators. Architects and engineers can stack elevator shafts on top of each other to save space; However, celestial corridors and high-speed elevators take up a lot of space and add to the time it takes to move between floors. Double-deck elevators, so that more people can take an elevator to two floors at each station. More than two floors can be used in an elevator, although this has never been the case. The main problem with double-deck elevators is that if only one person needs to reach a particular floor, then everyone in the elevator will be forced to stop. d Mall, Petronas Twin Towers, Willis Tower, Taipei 101 The Paradise lobby on the 44th floor of the John Hancock Center is also home to the first multi-level indoor pool, which is still the tallest in the United States.
Are Skyscrapers Environment-Friendly?
The world’s urban population is growing steadily. The United States is forecasting an increase from 3.6 billion to 6.3 billion in 2050, which inevitably means that buildings will have to accommodate more people and take up less space. Therefore, the demand for skyscrapers that use new technologies and innovative designs will increase to improve sustainability and have a less negative impact on the environment.
Locally-sourced construction materials
Skyscraper construction has a huge impact on the environment, and using locally sourced materials can reduce the impact during the construction process. The Bank of America tower near Times Square is one of the tallest buildings in New York, taking up 40% of the area, the location of raw materials to reduce the energy consumption and emissions associated with the transportation of materials from distant countries.
The higher the skyscraper, the tougher it is in strong winds. The 632 meters high Shanghai Tower ranks second after the Burj Khalifa in Dubai and therefore has to withstand strong winds, transfer wind and thus reduce the resource intensity of the structure.
To be more environmentally friendly, some skyscrapers took the word literally and added green vegetation to the entire structure. Singapore’s Green Tower, to be completed in 2021, is a perfect example of green architecture with strategically placed lush green spaces. Which 0improve the carbon footprint of buildings everywhere while creating a more flexible and relaxing natural environment for residents.
Singapore is also home to the Oasia Hotel Downtown, covered in 21 vines and green flowers, forming a bird and wildlife sanctuary in the center of one of the most urbanized cities in the world. The building has ten times more vegetation than the same open space. The tower’s open garden also reduces the need for mechanical ventilation.
Not only do skyscrapers withstand strong winds, but they also offer a unique opportunity to be used as a sustainable source of energy. The Bahrain World Trade Center was built by Atkins, a multinational engineering company, using sleek and practical wind turbines. The tall building on a small island in the Middle East is inspired by traditional wind towers and directs the wind to turbines attached to the facade of the building.
Temperature regulating façades
One of the biggest energy costs for skyscrapers is keeping the indoor climate at a comfortable temperature, whether it’s heating in a colder country or cooling in a warmer environment. Central heating and air conditioning are resource-intensive and will cause a larger carbon footprint. In large buildings, some new and more sustainable buildings have smartly designed facades that greatly reduce heating and cooling needs China International Financial Center High-Temperature Control of Green Buildings.
South China’s Ping An International Financial Center (IFC) is the tallest building in the region, but the cost of its skyscraper is 46% lower than traditional commercial buildings. The design also has external vertical stone ribs that provide shade and reduce the need for an internal cooling system.