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| العمارة والتخطيط ................ بإشراف : ابوصـــــالح, جمال الهمالي اللافي, فيصل الشريف, احمد حسني رضوان |
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LinkBack | أدوات الموضوع | تقييم الموضوع |
06-12-2005, 12:57 AM
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Burj Dubai
Location and Technical Data Burj Dubai is located in Dubai and its height is 705 m (2,313 ft). It consists of 160 floors. The construction will end at 2008. This construction is developed by Emaar Properties, architected by Skidmore, Owings and Merrill LLP and the general contractor is Samsung Construction Company. The Shape and Problems Faced DUBAI, United Arab Emirates for now, the worlds tallest building-to-be is just a flower-shaped concrete tattoo on the desert sands, but its pilings are already in place, plunging 160 feet into the earth. When it's finished, visitors will swoon over this city from 123 stories high, if not more. In fact the Burj Dubai will be much higher, the developers say dozens of stories taller than skyscrapers in Taiwan, Chicago or anywhere else. But they are keeping the exact height a secret to flummox competitors in the world's furious race for the title of tallest skyscraper. This building has been engineered very carefully, and on super-tall buildings there are all sorts of factors that affect how the structure will work. For example, a building with the same shape of floor plate all the way up and down is not as good as a shape that changes as it goes up. And there’s a phenomenon when the wind blows on a building: let’s say the wind is blowing from the west – it will hit the west façade and it has to get around the building, so it starts moving up the wall, down, and around the sides. The wind actually accelerates because it has to move not only the air that’s blocked by the facade but also the air by the two sides, compressing the air as it moves around the tower. This compression at the tower's edge and subsequent decompression on the back side of the tower creates eddies, or vortexes, that can exert stronger forces on the building than the wind itself and these forces tend to pull or rock the building from side to side. It is this acceleration of movement that we design. The shape and skin texture of the building play an important role in vortex shedding because they can help to prevent the forces from building up in a harmonious way. The three-legged shape of the floor plan on Tower Palace III and Burj Dubai give the buildings significant width to withstand horizontal movement and depth to buttress against the wind forces. One of the important things we learned was that the taller legs need to be on the sides of the prevailing wind rather than the front face because that sheds the vortexes more effectively. The texture of the facade and the weight distribution also affect how wind impacts the structure – for instance how much weight is at the top of the building, and where the columns are placed. Materials Buildings utilize an extensive number of building materials but their structural systems usually have one material (either concrete or steel) as the predominate material to carry the structural loads. Since the 1960's there have been an increasing use of "composite systems" in which both steel and concrete are utilized together in ways that neither material predominates over the other. Concrete is much more robust than steel when you hit it. It's also much better at resisting fire. The materials that will be used, such as glass for a clear, lightweight look.Nearly 18,000 cubic meters of concrete was poured for the tower piles and 15,000 cubic meters of concrete was used for the podium piles. The structure is all reinforced concrete below the spire. The spire above the observation floors will be steel. Architecturally, the building will transition from a solid base expression to a vertically expressed middle section of polished stainless steel projected metal fins and glass. It's wanted to use only vertical elements here because the fine dust in Dubai's air will build up on any horizontal projecting elements of the wall. They have sandstorms quite frequently so in order to reduce maintenance costs this tower will have virtually no horizontal ledges. written by uae_virus6 
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10-12-2006, 01:59 PM
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ارجو انك تبعثي لي مخططات لمبنى من steel والك جزيل الشكر على *****ي mah_k1984 على ******وو او الهوت
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