Does the NDS have a required (maximum) diameter for hole size in a flitch steel when fastening it to a wood member? Or does anyone have suggestion what size hole to put in the steel plate? The application is an 1/8" steel plate fastened to the side of an existing glulam purlin with 1/4"...
Thanks robyengIT and SlideRuleEra on sharing the information. Both are helpful. I am looking at the bearing manufacturer's website for information. On the attached drawing's material list for the bearing, Kullager is written in. I'm checking if that could be the bearing manufacturer's name...
I agree with your thoughts, but I've been told that isn't possible. The bearings have been replaced once with an oversized bearings, but now reportedly the replaced bearings are worn out and the bottom race is also ruined. As you will see on the attached bearing section drawing, everything is...
I have an interesting problem to solve, and thought I ask if there are any suggestions or standards and design manuals available that may help. The problem is in a late 1960's era 116' diameter x 90' bulk storage bin. At the interior, the rotating bridge is supported by a 11'-6 diameter...
Thanks for the reply and comments. It's always helpful to get another perspective. I've done some elementary analysis, but as you pointed out it depends on how the isolator is made. I wrote the post in part because I don't recall seeing torsion being addressed in a structure with isolators...
How are engineers treating spring isolators used to support exterior mechanical equipment supported by steel framing? Specifically is there a torsional force in the steel supporting framing from either vertical or horizontal loading? In the applications I'm referring to a spring isolator is...
Probably okay if you're needing a ballpark value or have ample excess capacity. I'm guessing for the short pieces you're need, the shapes are cold formed (bent). What grade stainless? A304 Fb is 33ksi, so nearly the same as ASTM A36. Unless you have fairly thick material, I suspect using hot...
On SBCA's website, I found a tech note on heel blocking that shows a in-fill panel, and is likely what I'll use.
KootK, that is what I suggested to the truss mfr, and they weren't keen on notching back the top chord.
Mike, I've used the Simpson's HGA10 in a similar, but the RBC looks simpler...
To use a rim joist, wouldn't it have to be the depth of the trusses which is 32"-36" on low side & 59"-63" on the high side? If it's 2 layers of 3/4" plywood, than the roof sheathing would have to be nailed to into the plywood edge. The truss manufacturer isn't real keen about notching the top...
I have a small commercial building using bottom chord bearing open web wood joist @ 16" o.c. spanning 54' with 1/2":12" slope, and bearing on a 2x6 wood wall. Low side heel depth is 32"-36". Not sure what is the most common or economical means to transfer the horizontal diaphragm to the shear...
Thanks for the reply. My question stems from the contradiction between MBMA manuals (1986 & 2006) and ASCE 7. MBMA give values for Load Case 2 with roof slopes less than 25 degrees, and ASCE 7 doesn't include Load Case 2 for MWFRS below 25 degrees. MBMA 2006 does acknowledge difference...
A short note to say thanks and I appreciate everyone who took time to reply. I hadn't thought of an unsymmetrical joist bearing causing torsion in the beam. A legitimate reason that can be checked. Thanks again, smb4050
Does anyone know the history - reasoning - purpose behind IRC section R502.6.1 - Opposite floor joist over interior supports lapped 3"? In this case there are 2x8 floor joist spanning 8' to 9' butt together over a double LVL beam and NO wall above it. A home inspector is saying telling a...
Is this a serious post? If yes first, get a retainer before doing anything. Second, check zoning ordinances if a pole that tall can be built (I wouldn't want it near my house), and aviation restrictions. IMO, this does not sound like something a sane person does unless there are extenuating...
Western Wood Products publication Tech Guide 9 www.wwpa.org/techguide has tables for axial load capacity of solid wood columns of various lengths for western wood lumbers. The one I have is based on NDS 2001 and 1998 WWPA grades, but I don't think there are significant changes with current NDS...
What is or used as OSHA's definition of an "adequate gripping surface" for a steel fixed ladder side rail? Specifically the cross section shape. I've read OSHA's interpretation letter of August 8, 2005 stating a 2" angle iron isn't considered to meet the requirement. I've also read reference...
It appears you are trying to solve multiply conflicting issues with a single magical material. Could a 2-piece metal flashing similar to a roof curb detail be utilized with the difference being it is fastened at its top and bottom? Install PVC flashing which will provide the chemical...
Just starting the design of a drilled pier to support a highway signalization pole that has a given design torsion of 63 k-ft, and plan to use ACI 318 for torsion design. I think AASHTO and/or FWHA have publications on torsion in drilled piers, but don't know if they address the soil mechanics...
Supporting soil properties affect the foundation thickness. ACI 351.3, Foundations for Dynamic Equipment is a good reference, and chapter 4 specifically discusses/lists rules-of-thumb method.
