High-rise Evacuation Methods

January 25, 2007

There was an A&E doc­u­men­tary on the World Trade Cen­ter the other night, discussing–as well as criticizing–the early plan­ning phases and con­struc­tion of the WTC.

It also focused some­what on the short­com­ings of the WTC, such as stair­wells hug­ging the core of the build­ing pro­vid­ing what they thought was extra sta­bil­ity, that led to so many civil­ian casu­al­ties dur­ing the 2001 attacks.

There was obvi­ous con­cern over the meth­ods used for high-rise build­ing evac­u­a­tion. In most cases stair­ways are used, pro­vided that they are in work­ing con­di­tion. The planes that struck the WTC build­ings destroyed a large por­tion of the stairs which in turn con­tributed to the lack of proper evacuation.

As I watch­ing this, I was think­ing about bet­ter ways for effi­cient and safe evac­u­a­tion dur­ing high-rise build­ing emer­gen­cies. One solu­tion (not nec­es­sary fail­safe) that occurred to me was an enclosed slide that essen­tially loops around the build­ing. The slide itself would be oiled so that when groups of indi­vid­u­als are prepar­ing to evac­u­ate, they descend in such a man­ner where clog­ging of the slide would be prevented.

Again, not a fail­safe method of course, but I believe one that doesn’t rely on the short­com­ings that occur with stair­ways. If you’ve ever used the stairs in a high-rise build­ing you know that this isn’t an effi­cient means of get­ting peo­ple out of the build­ing in a timely fash­ion, espe­cially dur­ing an emer­gency when peo­ple typ­i­cally lose the abil­ity to think sensibly.

Yet, when I was think­ing about this I real­ized that using a slide could also lead to over­sights in the process of evac­u­a­tion. It’s pos­si­ble that like the stairs in the WTC build­ing, a por­tion of the slide could also be destroyed. That said, it’s dif­fi­cult to try and come up with var­i­ous ways to effi­ciently trans­port peo­ple out of a build­ing and at the same time mak­ing sure the means of doing so are safe and expedient.

There are other meth­ods such as zip lines (think James Bond or the mil­i­tary), extend­able slides and chute sys­tems that could work but again, which of these would actu­ally work when the real thing occurs, as opposed to just test­ing them in labs.

I per­son­ally don’t think we’ve found a per­fect sys­tem yet, despite how much tech­nol­ogy has improved in the past 20 years, and I don’t feel like we ever will.

What should be stressed how­ever is that we need to have alter­nate ways of evac­u­at­ing peo­ple from struc­tures to pre­vent mas­sive casu­al­ties when an emer­gency occurs. 

5 comments

Kinda leaves you think­ing huh?

Good thing I work on a mere 3-story build­ing. Break some win­dows, jump in, done (pro­vided you land some­where you don’t break your bones)

BTW, hi there Erik. It’s been a while… :D

by beto on January 25, 2007 at 10:43 pm. Reply #

Hey, Erik.

One thought about the “oiled slide” idea:
flames climb fastest, going up.

(Which is why escape stairs are usu­ally not carpeted.)

Would be great to reach a bet­ter evac­u­a­tion solution…

by Michael Montgomery on January 26, 2007 at 2:46 pm. Reply #

Beto: In your case, you’d just aim for some bushes and you’d be set, pro­vided the bushes weren’t full of thorns.

Michael: Good point. That didn’t cross my mind at the time, but maybe a non-flammable oil-based solu­tion? I’m not sure what that sub­stance would be, however.

You’re right though, there has to be a bet­ter way to go about this.

by kartooner on January 26, 2007 at 5:28 pm. Reply #

i think if i were evac­u­at­ing a burn­ing, pos­si­bly explod­ing build­ing, i would be ter­ri­fied to jump in to a tun­nel, likely dark, in the fear of becom­ing the func­tion of a mass human clog. i think i’d take my chances elswhere. i believe all solu­tions have hin­der­ences and the per­fect method of evac­u­a­tion is unlikey though the sys­tem undoubt­edly needs much atten­tion– i com­mend your attempts!!

by amie on February 18, 2008 at 6:01 pm. Reply #

http://wtc.nist.gov/WTC_Conf_Sep13-15/presentations905.htm

Click on Catalan’s presentation

by rexsolomon on December 23, 2008 at 3:32 pm. Reply #

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