Anyone here have knowlegde of steel joists? I am trying to ID a joist
that is made of a pair of 1.5 x 1.5 x 1/8 angles for the top and the
same for the bottom, 1/2" diameter rod is zig-zaged inbetween. It
measured about 11-1/4" tall. I have done a whole buch of googling
and I now think it is a K series joist. I have not been able to get
any further than that.

Help??

BTW, its used to construct a wrestling ring outer frame.

Thank You,
Randy

Remove 333 from email address to reply.

You might try searching Bar Joists, and/or Bar Trusses, and see if a
fabricator's website lists specifications for sizes and loads.

K series is very likely correct for what you described, some may just have Z
bars, and others may have vertical bars within V bars.

--
WB
..........
metalworking projects
www.kwagmire.com/metal_proj.html


"Randy" wrote in message
...
Anyone here have knowlegde of steel joists? I am trying to ID a joist
that is made of a pair of 1.5 x 1.5 x 1/8 angles for the top and the
same for the bottom, 1/2" diameter rod is zig-zaged inbetween. It
measured about 11-1/4" tall. I have done a whole buch of googling
and I now think it is a K series joist. I have not been able to get
any further than that.

Help??

BTW, its used to construct a wrestling ring outer frame.

Thank You,
Randy

Remove 333 from email address to reply.

On Jun 17, 5:24*pm, "Wild_Bill" wrote:
You might try searching Bar Joists, and/or Bar Trusses, and see if a
fabricator's website lists specifications for sizes and loads.

K series is very likely correct for what you described, some may just have Z
bars, and others may have vertical bars within V bars.

--
WB
.........
metalworking projectswww.kwagmire.com/metal_proj.html

"Randy" wrote in message

...

Anyone here have knowlegde of steel joists? *I am trying to ID a joist
that is made of a pair of 1.5 x 1.5 x 1/8 angles for the top and the
same for the bottom, 1/2" diameter rod is zig-zaged inbetween. *It
measured about 11-1/4" tall. * I have done a whole buch of googling
and I now think it is a K series joist. *I have not been able to get
any further than that.

Help??

BTW, its used to construct a wrestling ring outer frame.

Thank You,
Randy

Remove 333 from email address to reply.

Here is a radical idea: Assume it's A36 steel (for determining load
capacity) and calculate the second moment of area (moment of inertia).

Wolfgang

Wolfgang

On Wed, 17 Jun 2009 15:44:32 -0400, Randy wrote:

Anyone here have knowlegde of steel joists? I am trying to ID a joist
that is made of a pair of 1.5 x 1.5 x 1/8 angles for the top and the
same for the bottom, 1/2" diameter rod is zig-zaged inbetween. It
measured about 11-1/4" tall. I have done a whole buch of googling
and I now think it is a K series joist. I have not been able to get
any further than that.


I believe the reason you're having trouble is that bar joists are
designed to to meet specifications that dictate maximum stresses and
deflections under specified load conditions and other functional
requirements, not the details of the design. It's up to the
manufacturer to choose the materials and construction to meet the
spec.

--
Ned Simmons

On Wed, 17 Jun 2009 15:30:00 -0700 (PDT), wolfgang
wrote:

On Jun 17, 5:24*pm, "Wild_Bill" wrote:
You might try searching Bar Joists, and/or Bar Trusses, and see if a
fabricator's website lists specifications for sizes and loads.

Here is a radical idea: Assume it's A36 steel (for determining load
capacity) and calculate the second moment of area (moment of inertia).

It's a bar joist, i.e., a truss.

--
Ned Simmons

On Jun 17, 8:44*pm, Randy wrote:


Help??


Thank You,
Randy


How much does it weigh per foot?

Dan

On Jun 17, 6:59*pm, Ned Simmons wrote:
On Wed, 17 Jun 2009 15:30:00 -0700 (PDT), wolfgang

wrote:
On Jun 17, 5:24*pm, "Wild_Bill" wrote:
You might try searching Bar Joists, and/or Bar Trusses, and see if a
fabricator's website lists specifications for sizes and loads.
Here is a radical idea: *Assume it's A36 steel (for determining load
capacity) and calculate the second moment of area (moment of inertia).

It's a bar joist, i.e., a truss.

--
Ned Simmons


Ned,

The top (compression) flange consists of two legs of angle, ditto for
the bottom tension flange.

For the first approximation simply use the equivalent of two flat bars
spaced by the dimension separating the two "bars". Calculating "I"
for this is simple, or can be looked up in a handbook.

For a better approximation take the total area of two angle sections
for each the top and bottom flange, separated by the vertical distance
between their neutral axes, and do the arithmetic. This would be
close and ok for this application. Don't forget that the
manufacturer designed the zig-zag bars and welds to carry the shear
and vertical loads and would not need analysis for this purpose.

A heavily loaded roof or floor is another issue, and I would not
condone the use of material with an unknown history of use in such an
application. But for a wrestling rink where the danger of falling
down or buckling is a distance of what? 3 feet or so I would not see a
problem.

Wolfgang

On Wed, 17 Jun 2009 19:54:15 -0700 (PDT), wolfgang
wrote:

On Jun 17, 6:59*pm, Ned Simmons wrote:
On Wed, 17 Jun 2009 15:30:00 -0700 (PDT), wolfgang


It's a bar joist, i.e., a truss.

Don't forget that the
manufacturer designed the zig-zag bars and welds to carry the shear
and vertical loads and would not need analysis for this purpose.

Yup, I got distracted thinking about analyzing all those pin-jointed
trusses 35 years ago and missed the analogy between the zig-zags and
the web of rolled beam.

--
Ned Simmons

On Wed, 17 Jun 2009 17:50:38 -0700 (PDT), "
wrote:

On Jun 17, 8:44*pm, Randy wrote:


Help??


Thank You,
Randy


How much does it weigh per foot?

Dan
I did not weight it. it has a bunch of 4" channel welded to it, I'd
need to subtract that, but I did find a bunch of specs that give #/ft
so that might just be the best way to ID it.

Thanks.

Next time they disassemble the ring, I'll weight a peice.

Thank You,
Randy

Remove 333 from email address to reply.

On Wed, 17 Jun 2009 15:30:00 -0700 (PDT), wolfgang
wrote:

On Jun 17, 5:24*pm, "Wild_Bill" wrote:
You might try searching Bar Joists, and/or Bar Trusses, and see if a
fabricator's website lists specifications for sizes and loads.

K series is very likely correct for what you described, some may just have Z
bars, and others may have vertical bars within V bars.

--
WB
.........
metalworking projectswww.kwagmire.com/metal_proj.html

"Randy" wrote in message

...

Anyone here have knowlegde of steel joists? *I am trying to ID a joist
that is made of a pair of 1.5 x 1.5 x 1/8 angles for the top and the
same for the bottom, 1/2" diameter rod is zig-zaged inbetween. *It
measured about 11-1/4" tall. * I have done a whole buch of googling
and I now think it is a K series joist. *I have not been able to get
any further than that.

Help??

BTW, its used to construct a wrestling ring outer frame.

Thank You,
Randy

Remove 333 from email address to reply.

Here is a radical idea: Assume it's A36 steel (for determining load
capacity) and calculate the second moment of area (moment of inertia).

Wolfgang

Wolfgang


I don't really care what the load capacity is, I just want to match
it.

Thank You,
Randy

Remove 333 from email address to reply.

On Jun 18, 8:06*am, Randy wrote:
On Wed, 17 Jun 2009 15:30:00 -0700 (PDT), wolfgang



wrote:
On Jun 17, 5:24*pm, "Wild_Bill" wrote:
You might try searching Bar Joists, and/or Bar Trusses, and see if a
fabricator's website lists specifications for sizes and loads.

K series is very likely correct for what you described, some may just have Z
bars, and others may have vertical bars within V bars.

--
WB
.........
metalworking projectswww.kwagmire.com/metal_proj.html

"Randy" wrote in message

. ..

Anyone here have knowlegde of steel joists? *I am trying to ID a joist
that is made of a pair of 1.5 x 1.5 x 1/8 angles for the top and the
same for the bottom, 1/2" diameter rod is zig-zaged inbetween. *It
measured about 11-1/4" tall. * I have done a whole buch of googling
and I now think it is a K series joist. *I have not been able to get
any further than that.

Help??

BTW, its used to construct a wrestling ring outer frame.

Thank You,
Randy

Remove 333 from email address to reply.

Here is a radical idea: *Assume it's A36 steel (for determining load
capacity) and calculate the second moment of area (moment of inertia).

Wolfgang

Wolfgang

I don't really care what the load capacity is, I just want to match
it.

Thank You,
Randy

Remove 333 from email address to reply.

To match the strength of an existing beam or truss you have to know
its section modulus "Z", or second moment of area "I", plus the
material. You can also replicate the existing beam by using a 3" or
4" channel for the top and bottom flange, separated by the same
dimension as the existing.

However, replacing an existing beam with one of similar strength but
differing size or configuration is not so easy unless one has the
information for "Z" or "I". Hence my encouragement to calculate it
using the simplifying assumptions I described.

The reason nobody is jumping up and down and offering to do this for
free are the liability laws for P.Eng.

Wolfgang