I'm familiar with Blodgett and his method to treat welds as a line. And I have looked at his example weld shapes in his manual, of which there are roughly a dozen (image below). But they are all simple typical shapes.
My question is how to apply the method to atypical shapes. Below are...
Folks, I just have a high level question about the ANSYS Mechanical Eigenvalue Buckling solver. It has always been my understanding that the Eigenvalue Buckling solver is a low-fidelity first-pass glimpse of a structure's buckling characteristics. In other words, use of the solver should not...
Folks, my project is actually a mechanical engineering project, but I think my question might be suited for this structural forum instead. I've not done much weld sizing in my career, but am now deep into Blodgett's Design of Weldments for an overhead crane I'm working on. It has various...
I'm on a team of mechanical engineers and we are a little bit out of our wheelhouse. We have taken training for ASCE 7-16 seismic design, so we know the basics. We have been tasked with designing a process piping skid to ASCE 7-16 seismic criteria. We are designing the skid, as well as the...
I'm reviewing ASCE 7-16 §12.9.1.1 about extracting enough modes for modal response spectrum method. I'm using the ANSYS software which reports mass participation for the three translational directions (UX, UY, UZ) as well as the three rotational directions (ROTX, ROTY, ROTZ). Does §12.9.1.1...
Folks, I'm a mechanical guy dabbling in some civil seismic stuff, meaning I'm out of my wheelhouse a little bit. I'm doing some seismic work with ASCE 7-16. I was told there is a USGS website to get Ss and S1 values for locations around the USA. What is the web address for that site?
Folks, as I understand, the ICC publishes the Building Safety Journal. I'm looking for an old article that pertains to ASCE 7:
Bachman, R. and Dowty, S. “Nonstructural Components or Nonbuilding Structures?”, Building Safety Journal, April-May, 2008
I searched all over the web but could not...
***Repost from my earlier thread in Mechanical Engineering. My work actually relates to mechanical engineering, but it didn't occur to me that "structural" would be the more appropriate subforum for this question. My apologies.***
Folks, in many seismic discussions I have had over the years...
Folks, in many seismic discussions I have had over the years, I have frequently heard reference to 33Hz. In terms of seismic, what is the significance of that frequency? Is there some geological reason that seismic vibrations around/above/below that frequency may not matter? Is that a magical...
I'm using Mathcad 8.0. I have the following table of data from a colleague.
I want to build this table of data in Mathcad. Then I want to pick from it for downstream calculations. In other words, downstream, if D/2h is specified as 2.8, I want to pick K1 from the table as 1.27. How do I do...
Folks, I am looking at 2021 ASME Sec. VIII, Div. 1, UG-32 for ellipsoidal heads. For the calculation of ellipsoidal head thickness, L states to look at Table UG-37 (image below).
If I look at Table UG-37 (image below), it does not look like it says anything about L for ellipsoidal heads...
Folks, this question relates to ASME stress linearization when being done in ANSYS Mechanical. If I open ASME Sec. VIII, 5-A.4.1.2 and look at Step 2a, it states the bending stresses are only to be included for hoop and normal component stresses.
In Mechanical’s post-processing, there is an...
Folks, I'm curious what the latest NRC-approved method would be to combine static results + seismic results. So far, all I found was ML13260A310 from the NRC. For context, my question pertains to ASME Sec. III design. My customers typically feed me a seismic spectrum, along with all of the...
Folks, I'm running a Sec. III, Div. 1 analysis in ANSYS. The customer's seismic input is in the form of an acceleration spectrum. I can't speak for other FEA, but the ANSYS response spectrum methodology takes modal data and churns it through a series of arithmetic operations, to include SRSS...
In ANSYS, I have been asked to take a 3D pressure vessel model and midsurface it to a shell model for FEA. See the section view in the image below. My red outline shows a change in thickness. Does anyone know of a clever way to handle this when simplifying to shells?
(before anyone asks, no...
Below is a section view of a 3D vessel/nozzle junction. When doing FEA for ASME pressure vessels, I have always taken a stress classification line (SCL) through the nozzle crotch region (i.e., red line in the image). I would also take blue lines for completeness. I would linearize the...
I'm quoting a job for a pressure vessel. The head has 6 large nozzles on it. It will be analyzed in ANSYS FEA. The prospect gave me a table of shear loads (i.e., across the nozzle flange) and axial loads (i.e., into the nozzle flange). They specified the shear loads as SRSS (i.e., the...
I'm in my mid-40s and am an established engineer. MSME degree. P.E. I'm paid well and don't really have any complaints about engineering. Married w/two adolescent kids. No mortgage, no debt. I have an itch to go to medical school to become a plastic surgeon. This seems like a very severe...
