Greetings all! I have what is probably a silly question, but I'm having a hard time figuring it out, so here goes.
I have an acceleration magnitude spectrum with a constant resolution of 0.125 Hz (call this Spectrum #1). These are steady-state vibrations in a building, mostly from mechanical...
Greetings All,
I'm working on a handrail project that has a very typical situation: Wall handrail with brackets and sleeve anchors into clay brick. Surely there are a million lineal feet of these in service.
Attached is how I would approach this problem. The rail is subjected to either 200 lb...
I was a big Mathcad user for years, but went another direction in about 2016. I'm revisiting the possibility of using it again and have been playing with a Prime 6.0.0.0 version.
I've run into two irritants right off the bat. I've spent about 20 minutes trying to figure these out, so it seems...
On a current project I developed a custom spreadsheet. For this thread, the details of the calcs don't matter.
Each scenario is in one spreadsheet. There are about 250 of these. (Writing a program and running these in a loop wasn't a good option or else I would've done that.)
After I got...
I'm working on a project with an enormous set of very complicated drawings. There are section cuts all over the place. As I'm moving around on the plan, I accidentally click one of these section cuts and it throws me hundreds of sheets back in the set, and then I go back and try to find my place...
Greetings everyone. One of my clients is a steel fabricator. They are working on a project with open-web steel joists. I think the joist manufacturer is a sub to the fabricator. I haven't been involved in the project up to this point.
It's a small retail building in a high wind zone. The...
Greetings. I'm working on a project that's under construction. It has mild steel threaded rods hanging vertically from steel beams in the roof. At the beam connections, there are double nuts below and above the beam flange. The rods are about 20 ft long and hang under only their own weight...
The following is a neat (free) article on how AI is being used in call centers and some of the struggles.
Undoubtedly, we'll be seeing some of this in engineering, if it's not already there in some instances.
One of my first thoughts is that engineers have two or three decades of using...
If a roof member supports a GWB ceiling, should the D*+L deflection limit be L/240 or L/180? I've always assumed L/240 for this, but I have a case in which it matters.
The wording is pretty specific: L/240 for "stucco ceiling" and L/180 for "nonplaster ceiling." Does that mean a GWB ceiling...
I'm looking for the source of vibrations in a building and would appreciate any advice.
Four story multi-unit residential. Residents in multiple units feel disturbing floor vibrations that persist for about a minute a few times per day. Daytime or evening. All year round.
Fairly light...
Sorry for the silly question, but here goes!
I need the lower, center, and upper frequencies for the one-third octave bands below 4 Hz. The references that are low-hanging fruit (like https://onlinelibrary.wiley.com/doi/pdf/10.1002/9781119038122.app3) start at higher frequencies.
I had this...
I've been asked to design a small bridge in an industrial complex. It'll be two span and presumably have some truck traffic. It does not need to adhere to dot standards. What design standard would you use for this? Any advice would be greatly appreciated.
I have been tasked with measuring elevated floor and wall vibrations in a historical building with delicate plaster, artwork, and artifacts. The excitation will be short samples of jackhammering and sawcutting on a floor below. The report will be used to inform the demolition contractor on which...
After 27 years of Windows, I think I've had enough. Does anybody have experience running Bluebeam on Mac or Linux? Obviously, virtualization would be required.
Does this work well, or are there issues with this approach?
Any advice and stories would be greatly appreciated!
After 27 years of using Windows, I have had it, and am ready to move to a Mac or Linux machine. I use SAP2000 pretty often, and realize it would require virtualization to run on a Mac or Linux.
Does anybody have experience running SAP2000 in such a way? Does it work well, or are there issues...
I'm designing a steel ladder at a private school. Figure attached. The ladder is at the loading dock, hence the removable guard on the left.
The default rail size is PL3/8x2-1/2. The rails extend 42 in. above the top rung, and are unbraced above the top rung.
I'm having trouble with the 100...
I've been using SAP2000 for 14 years and I knew this would happen someday. Today's the day.
I input an entire floor model with moderately complex geometry, hit run, and it computed natural frequencies in the kHz range. I had forgotten to change the units to feet. Thus, my 28 ft long members are...
I am searching for information on "self-collapsing" towers, especially monopoles. I've also heard the term "crumble zone approach." I'm not finding much information on this. What design standards or references talk about this?
I have been asked to weigh-in on the idea of putting a monopole...
I'm trying to figure out how to use LL reduction in SAP2000. I did the following:
1. Define a load pattern called "Live" with type "Reducible Live."
2. Assign area loads uniform to frame (shell) to all the shells in the floor. Load distribution is one way.
3. Run the analysis. The axial load in...
Yeah, I know, my google-fu is weak. I've spent a half hour looking now, and give up.
Can someone grant me an estimate of the elastic modulus for typical rigid board roof insulation?
While you're at it, how about E for typical gypsum board?
Thanks in advance,
100000e
