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Thanks for the helpful discussion. I agree, I typically handle the same way with rigging arrangements and spreader bars. Provide general arrangements, required rigging arrangement, and notes describing intended use and limitations. Those products may very well be used for the next 20 years and...

Project involves design and fabrication of support beam to provide temporary shoring of heavy equipment during a rigging and placement operation. As is often the case in heavy rigging the support beam will span across blocking. Any concerns regarding stability of the blocking? I am required to...

Unfortunately these programs and ideas are pervasive in every industry and so many small companies have been bought by large conglomerates that it just keeps percolating through. Some recent observations. Think of the simple function of a parking lot attendant at grocery stores; observe now...

Basically selecting a trial member size, then compute reduced section properties based on corrosion allowance, and then verify member meets design requirements based on the reduced section properties.

Does anyone have any reference or research literature for additional resistance factors for a specified corrosion allowance compatible with AISC design criteria? ASME specifications have methods to handle a corrosion allowance. I have a structural specification and looking for a method other...

Understood regarding the use of more detailed analysis methods for the plates. What I am trying to work around is a structure that is governed by components with mixed code requirements. Things under ASME codes, not necessarily pressure vessels, but items like Below the Hook lifting devices, are...

Risa 3D - Non-Building Structures Webinar At the 52.19 mark in this video there is a discussion about interpreting the plate element results in comparison to code checks. This particular example was run with Allowable Strength Load Combinations, so the von Mises stress was compared to the yield...

Josh, Thanks for the information. Correct, I probably was not clear, I was referencing a load case without any lateral force component. Perhaps I should have stated I do not have a load case that does not include some form of lateral load. Since all my load cases include some form of lateral...

Risa Help Document "The two beams are each modeled at their correct centerline elevations. Both the top and bottom members need to have a joint at the point of intersection. The distance between the joints would be half the depth of the top beam plus half the depth of the bottom beam. The...

For a situation with grillage beam assembly with several beams sitting cross wise on a carrier beam I have used rigid links connected between the centroid of the shapes to model the behavior. At the node that ties to the carrier beam I have released all moments as my initial attempt without...

I have read through many of the threads from 2007 to about 2013 regarding the implementation of the Dynamic Analysis Method and Risa 3D. I have done several example problems on this topic and would like to finalize my understanding of the current state of the software. I have an application...

I second and highlight Lomarandil's post: *** If the crane has a large counterweight and the boom is in tight with no load on the hook, the crane is unbalanced in the opposite direction. This happens alot while the crane is mobilizing around a site, and can have nearly as pronounced an effect...

Coming from the perspective of someone who has to assign things to people; you do realize that sometimes we do not have all the details worked out just yet? If I had the time to dig in and complete the work I would start to get into those details as I progress through the work, at the onset all...

EngineeringEric, It is not to say its too complicated or anything else. This is a fundamental issue that is present in the companies that are doing this work. Its a lack of appreciation from top to bottom. The organizations have been stripped bare over the last X number of years and this is...

Great post from JStephen and I do not want to completely hijack the thread but I have been meaning to post about this topic for a long time. I agree that there is a huge gap in large equipment and fabrication design between equipment/mechanical design codes and structural design codes. My...

Unfortunate that peoples minds so quickly give negative connotations to ZDAS04's remark. I do not know ZDAS04 or anything about him, but I know ZDAS04 is only communicating with best intentions what he knows in his heart is the solution to adversity. He is communicating that hard work...

Frames are existing and similiar setup is proposed for future work so I need to validate the design and prepare new designs. I do not have any of the original calcs or analysis except 40 years of service. I was just mainly hung up on the concept that for the same base plate I need require to...

Thats the last piece that I wanted to hear explained. If the base plate / anchorage is not designed to resist the full moment we begin to form a hinge, allowing rotation - hence our assumed pinned behavior. Thanks for you help and input.

Thanks SteelPE, That is essentially where I am headding. Modeling the rotational restraint and moving on. The frame is similiar to a pipe support rack or large gas station sign. (Flagpole situation) No additional frames or support out-of-plane. I am just having an academic dilemna in my...

My stumbling on this particular situation is that the single bay frame is an equipment support and must resist out of plane loading. Therefore to resist these loads we have detailed and designed the base plates as "fixed" for transverese loads applied to the frame. Additionally the frames are...