150 feet span roof 13

[dgkhan]

I have to design a circular roof 150 feet diameter. Shall I use two way steel truss. by the way what is space frame, is it two way truss? (the roof is flat so nothing parabolic)

 

[dgkhan]

JAE.
this roof has a downward slope so good candidate for ponding in my opinion. so I will avoid this approach. And do not worry, the design of this roof will be ok.If I do not feel comfortable, I will hire someone.

 

[zoparrat]

A "bicycle wheel" type roof is also a good option. Utica Municipal Auditorium is an example:

http://books.google.com/books?id=f0...utica municipal auditorium cable roof&f=false

 

[dgkhan]

thanks zoparrat. It is the same concept other pointed out before with tension ring in center and radial trusses. Personally I think space truss will be more elegant. I only need to know how to design it. Do you have some reference available just like you posted for cycle wheel roof.

 

[BAretired]

Why don't you visit the library at the nearest university and read up on the design of space trusses? You cannot expect a crash course on a forum such as this. Space trusses are designed using the same principles as any truss, namely statics but you first must decide on the shape of the space truss.

BA

 

[dhengr]

BA.... What’s a liberry? I got my Ph.D. from Google and the internet, just fine, and I’m incensed that all you smart guys can’t just give me the formula for space frames, then leave me alone, and quit telling me I should be giving this crazy idea more thought. Do I get any extra credit for persistence, albeit a fairly naive insistence that even if I don’t know what a space frame is, I will know how to design one, and I will know if-and-when I am uncomfortable designing an elegant space frame spanning 150'. Next thing you know, you will be telling me to study a couple of the failures of these kinds of roofs, all done by engineers much smarter on the subject, than I am. I’m going to Toys-R-Us tomorrow to see if they don’t have a space frame or space invaders or spaced-out kit I can buy, I’ll show you guys.

Dgkhan.... Wake up, this is serious business, not likely learned from an internet link or a twitter from a twit you don’t even know or who may have no more experience than you do on the matter. You have gotten some good advice and suggestions, now get a life, get some experience on this kind of structure under the guidance of someone who knows what he/she is doing, because you obviously don’t. Right now you and your thinking are dangerous, wherever you are.

 

[hokie66]

dgkhan,
If you are still considering designing a spaceframe on your own, I suggest you read up on the collapse of the Hartford Civic Center in 1978. Better to know what not to do before you start learning what to do. But for a 150' circular roof, a proprietary system would be my choice. It's just a commodity item. By the way, the Hartford Center is discussed in Levy and Salvadori's book "Why Buildings Fall Down". You will find several of the other systems suggested above there as well.

 

[dgkhan]

Thanks hokie66. As I said in my posts before that I need some exact book name / reference which no body could give. So I will contact the technical support of Bentley and CSI etc and also try to contact
my decade old teachers at Princeton, NJ if they are still there.
To all of you who have spend time in writing mocking comments, you can clearly read in my post that I will hire someone for help if I could not do it. Anybody interested and confident that she/he can do it multiply it's salary x 2 and I can hire.As a head of my company I also like to learn as mush as I can which created so much ado.

 

[a2mfk]

Take your own advice, if you are a real person and actually performing some type of engineering services, and hire someone to do this for you. You are way too wealthy and smart to bothered with a space frame.

And read this article, you may have a serious case of the Dunning-Kruger effect going on right now.

 

[RacingAZ]

My apologies for being late to this online version of a flogging

What is sad and scary is that the OP is probably some offshore engineer doing outsourced work for North American projects.


dhengr – I just promoted you to a 5-star general and a2mfk to a 4-star.

 

[slickdeals]

@RacingAZ:
Not right. Just because some person is named "khan", you should not assume that he is an offshore engineer doing outsourced work.

 

[RacingAZ]

@slick:
Not right. You’re the one on the wrong here for assuming I did.
I'm not that stupid to base my hunch on an online handle.

I was curious that someone didn’t know what a space frame is and yet is attempting to design a 150 ft. diameter roof. So I actually looked at some of his previous posts that led me to believe that he is one of those engineers.

 

[slickdeals]

@RacingAZ: My apologies. I am a little sensitive when it comes to stereotyping. I am from India and lately, there has been a little too much immigrant bashing.

There are competent engineers in all parts of the world. I do understand what you are trying to imply by "sad and scary" when it comes to work being outsourced. A lot can get lost in translation. Let's hope its not one of those cases.

 

[BAretired]

There should be no place on this forum for immigrant bashing. But at the same time, the OP sort of set himself up for criticism by the way he phrased his question. A person's ethnic background should have nothing to do with the responses he receives on this or any other forum.

BA