Oh, they have definitely added staff. Some of them are probably very good. The issue is really that they've lost a lot of institutional knowledge....
You have to think of a legacy program as an old building that was built for one purpose and has been re-modeled and re-purposed over and over...
That's a really good point. Also, keep in mind that the reason why I frequently give caveats explaining my bias against RISA is because they have threatened me with a lawsuit in the past. Specifically for my posts on sites like this that were truthful, but which made the company look bad...
Whether or not your software accounts for the P-Delta softening effect in the eigen solution / natural period calculations can be tough to tell. When I was at RISA, the company exclusively used the "secondary shear" method of accounting for P-Delta. The problem is that this doesn't affect modal...
We're talking about using the Rayleigh method to calculate the natural frequency of the structure. Right? In this case, the only thing that matters is the lateral forces applied, the lateral deflection and the mass / weight at each level.... for the most part.
But, take a look at that example...
There are easy ways to "plug" the hole as well. I had a similar issue with my parents' house 25 (or more) years ago. I went through the crawl space under the house looking for anywhere I could see "daylight". I had some self expanding foam stuff that I got from Home Depot and just sprayed it in...
I don't think it's all that uncommon to stamp another engineers plans / calculations.
a) This happens EVERY time you have a junior engineer doing work for you. It's just that the stamping engineering is taking "responsible charge" for calculations and plans. Presumably because they have been...
I was not understanding the following part of it.
So, I looked it up and found this:
i.e. Global warming is going to cause x, y, and z withing the next 10 years..... Ten years go by and x, y and z do NOT happen. Ergo, the theory is basically false....
Hey.... That's the one I put together for the RISA training manual on dynamics. I always liked putting together a classic hand calculation to demonstrate the validity of a feature in the program.
Honestly, it would help to know a little more. Total length of wall, height of wall. And, pictures.
Another question is whether you believe the safety factors for sliding and overturning are sufficient.... It which case it's just an issue of reinforcement of the wall.
Concrete or...
I should also point out that I did an example problem (when I worked for RISA) that demonstrated how VERY accurate this method was when compared to a standard Eigensolution.
Yup, simple Rayleigh method. When I've done this in the past, I've used whatever lateral force distribution I've already applied to the structure. Might be wind load, might be seismic.
I don't think apply a single load at a single floor would be a good idea though....
I agree with the comments that this is just natural checking of a large sawn lumber column.
But, speaking as someone who's parents experienced this at their house.... I KNOW that a homeowner doesn't want to hear "it's fine". They look at it and think, "This just looks unsightly. Is this going...
Yeah, I don't think it's generally needed for such situations. I can see how some contractors my LIKE it because it does make alignment easier for all situations. So, a contractor who got majorly dinged for having his bolts slightly off might think this is "cheap insurance" for future jobs.... I...
They don't increase strength at all. At least not that I'm aware of.
What I believe they're used for is to help give the bolts some "wiggle" when you are placing equipment. Think of a 15 ft diameter vessel or tower with 20 of these fairly large diameter bolts. They are a pain in the butt to...
