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Old August 26th, 2007, 07:03 AM   #1541
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Earthquakes just don't play fair. The ground moves at the same rate and intensity whether there is a mammoth skyscraper there, or a feather! A mid-sized to strong earthquake would shatter the concrete and the structure would almost explode at the base, taking into account all of that weight! I seriously don't want that ever showing up on the news.
I was reading something on the effects of earthquakes to buildings in SF recently, and it actually said the taller skyscrapers became safer in such events than shorter buildings. Apparently it's to do with the fact the tall buildings inherently sway and are designed to deal with this. As earthquake vibrations travel up them their large mass actually helps as it allows them to release the energy steadily throughout their cores. It's actually the quick changes in load that overcome buildings, and if the such changes are more evenly distributed the effects aren't so severe. The trump tower is quite novel engineering wise, as in the load is carried by a system of flexible internal walls and external columns, so I guess they could deal with changes in pressure quite well.

Chicago is not going to have to deal with earthquakes any time soon, but it may well be safer to be in something like the trump tower than a small, conventionally built residential block during one.
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Old August 26th, 2007, 07:09 AM   #1542
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Love this shot!
this is just a beautful pic
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Old August 26th, 2007, 07:35 AM   #1543
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This building is looking fantastic, such quality cladding. It looks better in reality than in the renders, something that is more often than not the other way around.
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Old August 26th, 2007, 12:24 PM   #1544
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Quote:
Originally Posted by PresidentBjork View Post
Chicago is not going to have to deal with earthquakes any time soon, but it may well be safer to be in something like the trump tower than a small, conventionally built residential block during one.
Chicago won't have an earthquake, I know, but I'm wondering about the intelligence of producing tall, heavy structures in seismic zones like San Francisco or Los Angeles. To me, rebar reinforced concrete seems an unforgiveable combination, especially for vertical jumps where the weight of the building increases astronomically instantaneously. So, even for this structure in Chicago, which will be moving in wind and high wind events, what are the provisions made for brittle concrete. What allows the building to move laterally, keeping the concrete from cracking? I'm not crazy about tall structures composed of concrete and rebar.
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Old August 26th, 2007, 02:18 PM   #1545
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i love this building, very chicago
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Old August 26th, 2007, 05:28 PM   #1546
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Quote:
Originally Posted by milquetoast View Post
Chicago won't have an earthquake, I know, but I'm wondering about the intelligence of producing tall, heavy structures in seismic zones like San Francisco or Los Angeles. To me, rebar reinforced concrete seems an unforgiveable combination, especially for vertical jumps where the weight of the building increases astronomically instantaneously. So, even for this structure in Chicago, which will be moving in wind and high wind events, what are the provisions made for brittle concrete. What allows the building to move laterally, keeping the concrete from cracking? I'm not crazy about tall structures composed of concrete and rebar.
Concrete isn't exactly the most flexible substance true, but the stuff they use in these kind of structures is quite different from the usual concrete. Concrete obviously wasn't previously used in high rise construction because it would crush itself under its own weight eventually. However, new chemical and computer technology (which actually was developed for the now defunct 7 south Dearborn, but was then used by the same company when they won the contract to build the Petronas twin towers) combined with rebar has made modern concrete much stronger.

Plus the trump tower design distributes load from internal core wall to the outside columns. The fact that there is no actual solid internal core, only large load baring walls braced together means there would be more room for movement if they vibrated, plus some of that energy would in turn be distributed outwards to the outer columns.

I'm saying for a concrete structure it would be flexible, but if you are building in a earthquake zone perhaps a steel structure would be better, but then super tall steels towers need to have a rigid service core. (unless you use the traditional girder box technique they did with the ESB.)
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Old August 26th, 2007, 07:43 PM   #1547
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can't wait to see it finished. it is going to be such a nice addition to the already grate chicago skyline (second only to new york and hong kong that tie in the first place).
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Old August 26th, 2007, 09:16 PM   #1548
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Ok, looks great
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Old August 27th, 2007, 12:29 AM   #1549
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its going tobe a great asset to the skyline
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Old August 27th, 2007, 03:01 AM   #1550
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8-25-07







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Old August 28th, 2007, 12:28 AM   #1551
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Its slowly getting up there looking great
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Old August 28th, 2007, 12:40 AM   #1552
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Flickr.com

August 24, View from Sears Tower.

image hosted on flickr
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Old August 28th, 2007, 01:01 AM   #1553
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It is going to look great once it really gets above the surrounding structures. Great post Reinsdorf.
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Old August 28th, 2007, 01:14 AM   #1554
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cant wait till shots up passed the other buildings.
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Old August 28th, 2007, 02:45 PM   #1555
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Oh! There it is! What a great group of structures.
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Old August 28th, 2007, 04:28 PM   #1556
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super photo - thanks!!
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Old August 28th, 2007, 04:34 PM   #1557
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fab photo
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Old August 28th, 2007, 07:45 PM   #1558
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i think its been built in the best place to complement the other supertall buildings.
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Old August 29th, 2007, 01:50 AM   #1559
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August 28th, 2007

A few pictures of the park construction....










and a few of the building....




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Old August 29th, 2007, 02:40 AM   #1560
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I was also messing around with some more close ups....







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