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Old July 8th, 2015, 12:42 AM   #1521
Wrocer
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Quote:
Originally Posted by SF1977 View Post
IMG_0741 by Adamina, on Flickr

Salesforce Tower is the in the foreground.
WOW ! Thanks for this updating photo ! By the way I've just seen how many new and U/C towers has SF
They are quite tall and beautiful, but are they similarly earth-quake resistant like Trans-America Pyramid ?
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Old July 9th, 2015, 04:18 AM   #1522
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I read an article a few years ago(forgot what it is) saying most new buildings in SF are up to 7.0 magnitude earthquake resistant but the older buildings aren't as protected to earthquakes
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Old July 9th, 2015, 06:03 AM   #1523
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Hopefully by 2030 we'll see steel above ground.
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Old July 9th, 2015, 06:07 AM   #1524
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What's being build in that structure over the road to the right?
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Old July 9th, 2015, 08:42 AM   #1525
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What's being build in that structure over the road to the right?
The Transbay Transit Center

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Old July 9th, 2015, 01:09 PM   #1526
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Can you imagine being in a supertall when a 7.0 hits?

Change of underwear required!
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Old July 9th, 2015, 06:46 PM   #1527
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Quote:
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Can you imagine being in a supertall when a 7.0 hits?

Change of underwear required!
You would be better off in a supertall in a 7.0 than a 10-storey building.
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Old July 9th, 2015, 06:56 PM   #1528
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I love the proportions! Its also nice to see a tower that 'plays it safe' with the cladding. Some people call it boring, but I call it smart and formal - which is what you want for a serious city.
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Old July 11th, 2015, 03:13 AM   #1529
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Here is a nice aerial view I managed to take while visiting lovely San Fran for the first time and hopefully not the last just a few days ago..you have an awesome city skyline developing. Greetings from the UK, Adam.

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Old July 11th, 2015, 01:55 PM   #1530
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Old July 12th, 2015, 01:06 AM   #1531
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At Last !

Fresh photos from the construction site !

They make a progress, as we can see

Many thanks, potipoti !
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Old July 12th, 2015, 02:57 PM   #1532
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It will be pretty nice and a new landmark for SF.
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Old July 12th, 2015, 04:39 PM   #1533
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@ mr Cool: Very nice picture!!!
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Old July 13th, 2015, 12:04 PM   #1534
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Quote:
Originally Posted by Wrocer View Post
I've just seen how many new and U/C towers has SF
They are quite tall and beautiful, but are they similarly earth-quake resistant like Trans-America Pyramid ?
More so. The TransAmerica building was begun in 1969. There have been several updates to the building codes since then, most recently in the aftermath of the Loma Prieta and Kobe quakes. If anything, they are much tougher now.

The tallest building in that photo above is called One Rincon Hill.

One Rincon Hill

http://www.worldarchitecturenews.com...francisco.html

Here's a bit about its design:

Quote:
Solving Wind, Seismic Problems at One Rincon Hill
JANUARY 01, 2007 |
BY ROBERT CASSIDY, EDITOR-IN-CHIEF

Structural engineer Ron Klemencic got more than he asked for a few years back when he was called in by architect Solomon Cordwell Buenz on its One Rincon Hill condo project in San Francisco. Klemencic, co-founder of Seattle-based Magnusson Klemencic Associates, was somewhat surprised by the 61-story tower's wind problems . . . .

Wind tunnel studies showed that the building would produce back-and-forth accelerations of 25 one-thousandths of the force of gravity. The acceptable rate for a residential structure: 15-18 thousandths of the force of gravity.

To reduce the swaying, Klemencic turned to a technology MKA had used in South Korea, the Philippines, and Hong Kong—the tuned liquid damper. “It's simply a water tank,” he says. “Just fill it to the right level and as the tower sways one way, the water sloshes the other way. It doesn't cancel the sway. It dampens it down to an acceptable level.”

Of course, it's a little more complicated than that, which is why the tanks are still being tested at the University of Western Ontario, London. As the building goes up—the shell is half-finished—MKA will install electronic sensors to measure actual vs. predicted vortex shedding. Only then will the damper's design be finalized and a determination made as to exactly how much water to put in the tank.

Beyond the wind problem, the Building Team knew that it would have been difficult if not impossible to achieve the unique geometry of One Rincon Hill using conventional code-prescriptive seismic solutions. So Klemencic turned to a technology MKA had used in a 42-story office building in Seattle—buckling restrained braces. These “BRBs” (made by Star Seismic, Park City, Utah) will be attached to the tower's core wall at the 30th and 50th levels and linked to steel “outrigger columns,” forming a K-shaped brace.

The technology has been used in mid-rise buildings in Japan and California, but Klemencic says One Rincon Hill will be the first high-rise concrete residential structure in the U.S. to use it. The design has been validated in full-scale tests at the University of California, Berkeley, to resist seismic forces two-and-a-half times greater than code requirements.

Klemencic estimates that the liquid damper will save $2-4/sf over stiffening the building with more concrete, while the seismic bracing will cut $5/sf in costs compared to conventional code-prescribed designs.
http://www.bdcnetwork.com/solving-wi...ne-rincon-hill

The other slightly shorter towers in the photo use more conventional designs but all are certainly designed to be earthquake resistant.
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Last edited by Cal_Escapee; July 13th, 2015 at 12:13 PM.
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Old July 13th, 2015, 12:40 PM   #1535
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Awesome development
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Old July 22nd, 2015, 06:41 AM   #1537
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Love it. Go san fran, go!
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Old July 23rd, 2015, 02:26 PM   #1538
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yesterday


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Old August 10th, 2015, 11:24 AM   #1540
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