Good morning. I am working on a large project with several moving motor driven components. The time needed to complete a components move will vary with the distance of the move and the characteristics of the motor. There are dependencies between one component to others throughout the process...
I would like to toss out a conundrum that I have worked myself into. It is is unfortunately somewhat related to a 2022 post "Weight Distribution Over Six Points" that ended up being a time consuming adventure for several folks. My question relates to the footpad reactions that we structural...
In foundation construction (my cases are typically industrial and within existing facilities) I have formed the opinion that it is better to excavate a foundation, place reinforcement, and fill the entire excavation with specified concrete as opposed to a thinner structural section at the bottom...
I am curious to get a few opinions on using end offsets and/or Analysis offsets in RISA models. I tend to encounter a need for many of these in designs, if I were to really try to match the reality of a projects geometry. However almost every time I use them I end up with anomalies in the...
The company I work for has recently been licensed (COA) in Louisiana. I carry the NCPE. Can anyone confirm there is no COA STAMP required on the design drawings?
I have looked at the Louisiana rules and I do not see a COA stamp definition, nor do I see a LA COA stamp on any of the stamp vendor...
I have a simple T connection of two HSS12x8x3/8's. I am interested in making a clear hand calc, followed by a spreadsheet as I expect this connection will happen often in the future. A few parameters that are in my mind:
- this connection will be all welded.
- there will be field weld...
I am designing a series of shop fabricated horizontal weldments made from HSS12x8's that will be flown in and supported by an existing grid of WF columns. The idea was to minimize the plant outage by replacing the equipment floor but reuse the existing column structure. Note, the floor is a...
Good morning. We are finalizing a few foundation details, I was curious what folks do to protect against concrete voids under embed plates in flat concrete. As the concrete is placed and the concrete is vibrated are there any measures anyone takes to eliminate poor concrete/steel contact under...
I am looking to design a horizontal embed flush with the top of my concrete footing at a tight elevation tolerance. The load on the future column that will be field welded to the embed is small, particularly in the shear and uplift. But the elevation is something I want to make as easy as...
I am working on a design that requires a steel frame to span between the faces of two concrete walls. I would like to simply detail an end plate connection at the ends of the new HSS shape spanning between the walls. I am concerned that any shop inaccuracies with the fabrication or any...
I am using ASD to design a support structure for heavy equipment. The equipment and support structure will be independent of other framing in the building. I have calculated the dynamic machine loads, machine gravity loads, and the machine's seismic load and translated them to the support feet...
Good morning! I am designing a horizontal lifeline and I have been researching for a couple days what material I want to specify. I believe I have a good understanding of the behavior of the lifeline and my calculations are going to hinge on the AE of the cable. I have a lot of great discussion...
I am looking at a machinery foundation design. Given the machine vendor drawings there is a reciprocating load identified as "10,000LBSF @1.0G". I know the center of mass location of this load. What is bothering me is translating this load into a static load for design. I have spoken to the...
