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Old July 10th, 2009, 02:23 PM   #19061
gerald.d
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Quote:
Originally Posted by Dubai Skyscraper View Post
wow without the big crane Burj Dubai looks much higher
It's not to do with the crane being removed, it's because of the lens being used.

Compare and contrast:



Both shots taken from exactly the same spot, with exactly the same camera and lens.

In the one on the left, the camera has been pitched upwards to get the desired framing, which means the film/sensor plane is no longer perpendicular to the horizontal. This causes vertical lines in the photo to converge, meaning the Burj looks squashed and as if it's falling backwards.

In the one on the right, the lens has been shifted up, with the film/sensor plane remaining perpendicular to the horizontal. This means all vertical lines in the photo remain vertical.

The result is that you actually get to see the true perspective of the building, rather than a distorted one.
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Old July 10th, 2009, 02:29 PM   #19062
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Quote:
Originally Posted by gerald.d View Post


The building's pressurized?

/edit

Water would still boil at a lower temperature outside though - the ambient temperature would have no effect the boiling point.


its not what he means maybe.. maybe he meant the elevator...or the fire exit stairwell? not the whole building?

ALTIN what do you meant by it, the internal pressure is 0.49kpa only from ground to top. as far as the cladding is concern.

to answer BuildMile, yes there is a significant pressure difference between 0 and 818m, the double glass unit for curtain wall on 818m will "explode" pillowing effect, if not treated well. Do you know that the deflection cause by the pressure differnnce is more than the deflection caused by maximum windload 5.5kpa?

this is the study i made for burj.



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Old July 10th, 2009, 03:09 PM   #19063
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What I meant is that because of the ventilation and air conditioning system, the difference in air pressure inside would be less then the air pressure difference between the ground level and the outside of the same height above ground.
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Old July 10th, 2009, 03:12 PM   #19064
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Quote:
Originally Posted by gerald.d View Post
Water would still boil at a lower temperature outside though - the ambient temperature would have no effect the boiling point.
True but the boiler/heater will be less effective due to the heat exchange, therefore taking longer to heat the water up to the boiling point.
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Old July 10th, 2009, 03:14 PM   #19065
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Quote:
Originally Posted by AltinD View Post
Since the building will be pressurized, that would not be the case.

If you'd try to go around it and boil the water on the open terrace, the effect of the lower pressure up there would be compensated by a lower air temperature so that will not work either.

It's a loose, loose situation.
The building being pressurized doesn't mean the pressure won't be less at the top than it is at the bottom. In fact, more pressure in the building will mean there's even greater difference at the top and bottom since their will be a greater mass of air between the two points than there would be outside.
All assuming they don't control pressure between floors too.
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Old July 10th, 2009, 03:15 PM   #19066
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this is true.
although for a building this size, it is hard to keep the inside:ground level pressure ratio even,
you can still get pretty close. it is easier if you have all revolving doors.

this was directed at altinD
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Old July 10th, 2009, 03:17 PM   #19067
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They will use revolving doors, both for the outdoor terraces and the lobby entrances and other indoor doors in the lobby area.
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Old July 10th, 2009, 05:10 PM   #19068
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Now that there are pictures of the interiors, because hi-rises in Dubai are being built at such a fast pace, have there been major issues with construction quality that leads to major fixes after the buliding is finished? Because the Burj is so huge and there are so many workers on site, I just hope quality isn't being pushed aside...thoughts?


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Old July 10th, 2009, 05:58 PM   #19069
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finishing is ok but nothing about the luxury, for 10-20 million dhs (price of the Armani Residences) I would expect better finishing .
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Old July 10th, 2009, 09:38 PM   #19070
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Quote:
Originally Posted by ChicagoismynewBlog View Post
Now that there are pictures of the interiors, because hi-rises in Dubai are being built at such a fast pace, have there been major issues with construction quality that leads to major fixes after the buliding is finished? Because the Burj is so huge and there are so many workers on site, I just hope quality isn't being pushed aside...thoughts?


God forbid they use Chinese materials and engineering...


More here:
http://www.grovsjov.dk/billeder/28-h...iden/index.php

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Old July 10th, 2009, 09:47 PM   #19071
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that is crazy !!!
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Old July 10th, 2009, 10:01 PM   #19072
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in the concrete of school building which collapsed recently due to earthquake didn't have steel rebars in them~!!!
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Old July 10th, 2009, 10:04 PM   #19073
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Well I think that this is a rather solid construction a normal building would have collapsed on itself, resulting in just a pile of rubble.
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Old July 10th, 2009, 10:07 PM   #19074
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How that building stayed in one piece?!
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Old July 10th, 2009, 10:11 PM   #19075
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Quote:
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How that building stayed in one piece?!
Actually now that I think about it, the answer is in the soil. The ground looks very squashy it must have softened the impact.
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Old July 10th, 2009, 10:19 PM   #19076
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i think it was a slow fall :p i wonder how the pizza tower is doing, i haven't heard about it or sean it for 8 years :s
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Old July 10th, 2009, 10:26 PM   #19077
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Haha, actually its Pisa not Pizza :P and i believe its doing pretty good since it has been declared stable for at least another 300 years after the phase of structural strengthening. It would be a pitty if Burj Dubai repeated the story of Tower of Pisa haha but it wont for sure
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Old July 10th, 2009, 10:38 PM   #19078
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just hope no one was hurt .
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Old July 10th, 2009, 10:44 PM   #19079
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They rigged it up so it would be more right-angled. So it's in better form now, but back to Burj Dubai now. Last 10 posts were off-topic!
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Old July 10th, 2009, 10:46 PM   #19080
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Quote:
Originally Posted by buildmilehightower View Post
in the concrete of school building which collapsed recently due to earthquake didn't have steel rebars in them~!!!
Not rebar as the cause, they excavated to near to the building causing foundations to slip.
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adrian smith, burj dubai, burj khalifa, downtown, dubai, dubai tower, emaar, megatall, middle east, rascacielos, sarajevo construction, skyscraper, spire, tallest, uae

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