Thanks for the reply. Good points about the ovalling of the holes. I was operating on the assumption that the bend radius was not tight enough to make an appreciable difference on a 1/8" hole. I will discuss with the client.
We definitely understand that whatever process could be very costly...
I am one of the structural engineers working on a project where we need to create a perforated steel plate. The plate is nominally going to be 1" thick, grade 50 structural steel (ASTM A572). We need to create thousands of 1/8" diameter holes through the plate. Some of the holes are...
We are providing foundations for a variety of very large scale precision machines (milling machines, balance machines, etc). Many of our clients are European or Asian companies, and most of the specialty machines are made by European companies, and being shipped to the US. So wherever there is...
Good article from Portland. Thanks. We actually reached out to them to see if they could provide the anchors, and they told us they do not do any metric bolts. I was pretty surprised, and very dissappointed by this. They are sort of what I consider the leader in the bolting industry, but...
Thanks for all your help. We had spec'd a prefab product (Peikko HPM bolt), based on the equipment manufacturer's recommendations. But now we find that the US distributor no longer carries that product. So we are working to find something similar, and the closest thing i can find is a...
So I have a project where we need to thread some rebar, to create an M20 metric thread on a US standard size bar. I am wondering if we need to spec out that they start with #7 or #8 bars. I dont know what the max shaft diameter will be, after the ribs are removed. I am leaning to the #8 bars...
True enough. Clearly, all the nails in a sheet of plywood will contribute to both. However, along the perimeter edge of the sheet, the trib for uplift is much less than in the field of the sheet, just due to the nail spacing. So the uplift force on the edge nails will be less than the nails...
Sorry for being absent since i posted this question. But it is very interesting to see that there is clearly no accepted approach to this problem. I also reached out to APA, and their engineer replied that they had never been asked this question before (paraphrasing), and suggested that they...
A question has come up on how to design nailing patterns for roof plywoood, considering combined interaction of uplift loads and diaphragm shear. I have typically done a linear interaction of tension/shear for fasteners, but can't find any direct language to this interaction for engineered...
It's weird, because Chapter 3 defines indoor pools as type A-3 assembly space. But they make no mention of elevated, outdoor pools, rooftop or otherwise.
Hi all.
We are working on an elevated, outdoor hotel pool deck per 2010 Florida Building Code, using a 2-way slab. The deck is over ground level parking, connects to the hotel lobby, and also has direct egress to the ground. We are having a debate on the appropriate live load, as the Code is...
Hi Rick
Thanks for your thoughts. I don't think they have a PT sub yet, as they are CM providing pre-construction services, but we will talk with them when they do.
We agree that once the 2nd pull happens, that overall stresses should equalize. But in the time period between 1st pull and...
Hi all. We are doing a design of a large PT slab building where several walls butt up against adjacent walls. The slab spans are long enough to require stressing from both ends, but because of the walls, we don't have access on one side to stress the tendons. So our first thought was to...
Sorry, should have mentioned that project is in the amazon jungle, so unlikely to get any good historic test data or ASTM style testing of the sand. When i said local supplier, i meant local here in the US. I have no contact with any supplier at the job site. cement will be bagged product...
Hi all. We are working on a project which is located in an area where there is no coarse aggregate at all, only sand. We had desired to create a 4000 psi sand-cement mix to use for structural foundations, slab on grade, 8" thick 2-story high walls, CIP stairs, and infill on composite metal...
So I was at a job site visit the other day, and when reviewing the photos I took, I noticed that some of the Tapcons used to install wood straps (Simpson straps and buckets) had countersink heads (Phillips flat head), instead of standard hex heads. I don't know overall how many are affected...
JStephen: You are right, getting to the "required" frequency is going to be near impossible. I suspect that the requirement is somewhat arbitrary. They have also provided some rotational and torsional deflection criteria, which I will also be checking. But they are all VERY small, like 1...
I guess I found my problem. While reading some posts on the Bentley tech support forums, I was reminded that I need to define the mass in the direction of possible motion. I had only applied selfweight in the Y direction. Once I defined it in the X direction, the frequency went down to about...
I'll try to answer everyone:
There will be a load at the top (5kip) but right now I am just trying to justify my analysis method versus known equations. So I am using tube of uniform dimension (12ft diameter) and uniform wall thickness (1 inch). So the self weight is uniformly distributed...
