That is correct, but I was using ASME BTH-1 for this lifting beam design rather then the CISC handbook. The ASME code is where the unbraced length calculation comes in with bending (i.e. Lr) [3-2.3 Flexural Members].
Using the Beam Selection tables in the handbook I can see how overdesigned the...
Using this revised lifting arrangement I am still getting an issue with the unbraced length posed for the initial problem, Lu > Lr:
Lu = 8'x12"
= 96"
Lr = sqrt[3.19 x (2.14^2)in^2 x 29000ksi x 1 / 50ksi]
= "91.5
Cb = 1 (unity)
rt = 2.14 in^2 (compression flange +...
BAretired:
I didn't show above the lifting beam but there are (2) existing monorails that are spaced 12' O.C. so this allows a vertical pickup.
canwesteng:
I will see what I can find for the through plate calculations, thanks for the idea on this.
dvd:
I have not seen this publication, I will...
If the plates don't line up from loading to support do you need to worry about wall failure using HSS? Simple solution, appreciate the response, just thinking ahead to my next concern?
Is the requirement for needing Lr to be more then Lu (or Le) correct?
Using an extremely heavy W12x106 beam:
Lr = sqrt[3.19 x (3.35^2)in^2 x 29000ksi x 1 / 50ksi]
= 144"
So this would be saying that a W12x106 fails if that is required, which already is a beam size that isn't feasible...
I am designing a 12.25ft lifting beam that is picked up by lifting lugs on the top flange of the beam. The lifting lugs are welded at the ends, being 12ft (144") apart, which I believe means the unbraced length would be 144"? The load is picked up by lifting lugs on the bottom of the beam spaced...
Carbon steel welding is governed by CSA W59; which provides Table 4.4 for the minimum fillet weld sizes for welding different material thicknesses. I can not find anything outlining the same requirements for stainless steel.
I have (2) pieces of 304 stainless steel to be fillet welded together...
NBCC 3.6.2.1.(6) requires a service room to be "separated from the remainder of the building by a fire separation having a fire-resistance rating not less than 1h."
If a service room is located in the corner of an open building, and has a small mezzanine above it not counting as a storey, does...
Just to add to the confusion one supplier stated that S114 does not apply to their panels, and noted as I referenced above from the code, while Kingspan notes online that they have panels that are noncombustible per S114 testing (K-Roc panels).
Just to be clear, this is a separate requirement...
The question I have is how do you determine if a type of Insulated Metal Panel (IMP) is noncombustible?
In this situation the code requires a building to be of noncombustible construction (for my example NBCC 3.2.2.89). The NBCC definition of noncombustible construction notes by the use of...
My question is with the lateral bracing requirements of a continuous beam under a uniformly distributed load.
For the image below the specific example I have has wall girts/roof purlins spanning (3) columns. The members will have sheeting on the outside that I am treating as a lateral support...
Thanks for the responses! Splitting the load makes sense, that would be relatively easy too with the angle being 45°. I wasn't sure if there were simple formulas to solve for
I am looking for help with finding the section properties of square HSS members that are rotated 45° (i.e. diamond).
I am using S16-14 to solve the moment capacity of an HSS beam, but I need to solve the Section Modulus (Z) first [Moment Resistance = (0.9)(Z)(Fy) , as per CL 13.5.a)]. The...
Not necessarily a structural question but I am working on a design with catwalks located above a network of bins. I need to determine what is required to meet code (NFPA 101 - Life Safety Code). My questions are below but here is the background for them. The catwalks are supported off of the...
I didn't realize something as simple as the image provided would count as bracing for the bottom flange as well. That's very easy from a fabrication side too.
Thanks everyone!
Thanks for all the responses.
If the purlins were to overlap as everyone recommends then technically it would not be a pin-pin connection (creates a moment connection). That would place the bottom flange in compression as EngDM mentioned.
For an option depending on ease of construction, can a...
This is more of a general question but if a building has frames that are x ft apart, meaning the purlin span is x ft, when is bracing required on the bottom flange of the purlins?
For this example I am meaning that sheeting is through fastened to the roof every 2ft, which is counting the top...
Thanks for the response kewli.
Incorporating the full stress range leads into the last part that I had wrote then. Not sure how this Claus incorporates the endurance limit of steel. If the beam can only have the force applied in one direction at a time (resulting in stresses of 95 MPa or 85...
For Clause 26 of the Handbook it is covering the design requirements for Fatigue. I am not sure for my situation if this clause should include the stress range or if it is just the max stress value. 26.3.1 states stress ranges that are completely in compression are not considered, my case has...
