Question about unequal angle capacity 2

[PowerRanger]

Hi fellow
Now i am meeting the case following:
There is a Unequal Angle 100x75x6 Bolted to the wall, which supporting (the timber bearer say 300x75, joist 150x50, and timber floor), I said the total point load from each bearer to the flange of UA is 11.2kN in strength limit state(included Live Load). The spacing of the bearer is 1.8m.
Now, I would like to check what maximum spacing betweem the bolt, the span of the UA(continuous). ( assume bolt is strong enought for taking the shear).
How can I check the biaxial bending capacity for the UA.

Thanks for your help!

 

[Ron]

marcoLEGS....this is pretty basic stuff. Do you have a Senior level engineer working with you locally?

Also, not sure of your configuration. Your framing seems to contain an extra level of support that is not usually there.

 

[PowerRanger]

I am just a recent graduate.
Yes, two level building.
So, the the UA is bolted to the wall, does it's properties still the same where the hogging moment occur?

thanks for your time

 

[Ron]

marcoLEGS...
I'm glad that you're reaching out to other professionals to help you, and I suspect you want to be sure of your questions and answers before you consult your senior staff. I hope you have a senior staff to consult locally, otherwise you should not be practicing as the final design engineer.

You're going to have to think through some of these issues, try a solution, and then put your solution in the forum for critique or confirmation.

My point about the extra support system was not related to a "second level". I know that! My point is that you seem to have a double, crossing joist system by your description. Your structural system would generally include the following:

Ledge angle to support a ledger board or band, though in masonry construction, the ledger board or band is usually anchored directly to the masonry and no angle is used.

The joists then frame into the band or rest on the ledger board. Solid floor joists are generally spaced at about 0.5M. Trussed joists may be spaced farther apart but not much farther.

The flooring is then attached to the joists.

 

[ajose]

marcoLEGS,

Just guessing, the Unequal Angle (UA) is attached to the wall.
Is that meant one leg against the surface of the wall?,
and
Are the bolts going thru the leg to the wall?

If it is like i said the angle is not acting like angle but like plates. One plate with forces acting in its weak plane and the other like support plate against the wall.
that is meaning

in rought words (taking away the code factors) the well known equations

I=b*t^3/12

where
I = inertia
b = analysis width
t = thickness of leg

stresses=M*(t/2)/I

where
M = moment

It is probably need a triangular plate to reinforced, this changed the expresion of inertia an stresses.

For the bolts take width, a diameter and fixed space and chek it by trial and error. Like and end plate under traction and moment.

Is the configuration different?, then regard my comments

Ajose