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Light gauge open web steel joists
2

Light gauge open web steel joists

Light gauge open web steel joists

(OP)
Greetings to all.

I am novice to the Forums and would welcome some information on application of light gauge OWSJ in seismic design.

I did R&D of a new light gauge steel joist which can be very competitive due to its structural efficiency and its automated fabrication process.  

I have not yet patented my design and I wish to keep it confidential until I find a J-V partner with deep pockets to feed patent lawyers for protection.  

In the meantime I wish design a building system based on my lg-owsj as the prime structural framing element for  walls, floor and roofs.

I wonder if any knowledge in earthquake engineering design related to such similar building systems is available.

Many thanks in advance.

Happy Easter.

Vince


 

RE: Light gauge open web steel joists

Not clear on what you are asking/looking for. Seismic response/performance of building shell with OWJ, or OWJ itself?

How is the performance of your design against wind, I think that's more imperative question you shall stress at this arena.

RE: Light gauge open web steel joists

(OP)
kslee1000

Correct. I'm interested in the seismic response/performance of building shell with OWSJ.  

I have designed, fabricated and tested the joist prototypes individually for residential floor loads.

I am now considering the possibility of also using the joists as wall framing members to reduce mass in seismic construction.

I am curious to know whether there have been prior applications or studies of this sort in building systems.

Thank you for your input.

Vince

  

RE: Light gauge open web steel joists

If you can post a simple diagram of the joist, and the application as a vertical building component, you would draw more interesting responses. I wish, and I hope, it sounds interesting to me.

RE: Light gauge open web steel joists

Hi, VG:

Was that you in the photo? Nice shot :)
Ok, fellows, let's start to provide pros & cons on this light weight joist. 2thumbsupbangheadcannon

What is the material and axial load capacity?  

RE: Light gauge open web steel joists

(OP)
No, I took the photo, thanks for the compliment.

I have not yet tested for axial loads. The design and tests were for floor joists.

UDL Single span floor design for housing construction
 
 A653 SQ 50/1 18ga galvalume steel. Limit State Design;
 Fy =50ksi; Fb=30ksi; E=29.5x10^6
 DL=10psf; LL=40psf; Total factored load=72.5 psf

LL  @ 16"o/c:  W= 53.32 plf

Deflection allowed=Delta/1.15  

Some design examples using the same sections:

12" joist self weight= 2.3 lb/ft;  
L/360 span = 22'-0";  L/480 span = 20'-0";L/240 span= 24'-0"

14" joist self weight = 2.3 lb/ft
L/360 span = 24'-0"; L/480 span=23'-0"; L/240 span=27'-0"

16" joist self weight = 2.3 lb/ft
L/360 span = 27'-0"; L/480 span=25'0"; L/240=29'-0"

Thank you all.

VG

 

RE: Light gauge open web steel joists

I applied for a patent for a product almost exactly like what you have, and after spending thousands of dollars for patent attorneys and supporting engineering analysis, came to the conclusion that another existing patent is too well written to be overcome in this area.

I hope you have better luck than I did.

RE: Light gauge open web steel joists

(OP)
o2basailor,

many thanks for the augurs well appreciated.  

I have done a comprehensive search for existing patents although I have not yet applied for a patent, I would be grateful if you could identify the existing one you mentioned.

Best regards

VG48   

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