Hi all,
Can someone direct me to where the design guide or pre-qualified details for steel (ordinary/special) moment frame connections? The connections were a part of my graduate curriculum that was kind of brushed over so I only have vague recollections of where to get this information. Some...
Hello
My colleagues and I design a lot of items like pipe/equipment support frames and seismic equipment anchorage using ASCE Ch13. Recently, we have been having a debate about when AISC 341 applies for non-building structures. Note we work in California and in seismic design category D.
AISC...
Hello all,
I have a little bit of a debate dispute at work relating to concrete testing. I have always been under the impression concrete cylinder testing is required per ACI316 for everything that is considered structural concrete. And more specifically, I consider equipment slabs on grade to...
Perfect. This is exactly what I needed. Really appreciate your help breaking it down for me! I knew there must be a simple solution to what I was trying to do. Thanks!
Hello,
I am relatively new to SAP2000. I used RISA before much more successfully, but I am still getting the hang of SAP's little details. How do I add a joint mid member?
I did a few searches but could not find a clear answer. Thanks ahead of time.
Hello. I have always thought that a layer of 6" compacted aggregate base over compacted sub grade is the industry practice for concrete slabs. I would think the reason is for improved sliding resistance + all the benefits of good compaction. Note the slabs I am talking about are heavy equipment...
I should have clarified. These are for foundation bearing hand calculations. I am using ASCE7 ASD load combinations with seismic like 0.6D-0.7Ev+0.7Eh and 1.0D +0,7DEv+0.7Eh. I pulled the soil bearing capacities from CBC Table 1806.2 2000 psf. I do not have a geotechnical report or any site...
Thanks for the responses. Follow up question.
I am wondering if a steel braced frame for a pipe support would fall under the scope of AISC Seismic Provisions. Its not a building but might fall under "Other structures are defined as those structures designed, fabricated and erected in a manner...
Hello all,
I have a concrete slab on grade for heavy equipment and I am running the stability calculations with ASD combinations. According to "Principles of Foundation Engineering" by Das, the factor of safety for bearing capacity checks should be 3.0. That seems high for temporary extreme...
Hello all,
I was taught in school that single diagonal bracing was not allowed per AISC Seismic Provisions 4a. System Requirements "Along any line of braces, braces shall be deployed in alternate directions such that..." Recently, I heard a different opinion from another engineer. So my...
Hello,
I wanted to ask regarding section shear area. From school and other sources, I learned that the shear area for a rectangular section is often taken as 5/6 the gross area. Does anyone know where this comes from? Is there a reference?
I would be interested to see if the reference would...
Hello,
For steel beam bending design, I was always under the impression that the compact/slenderness checks were only in AISC table B4.1b and that B4.1a does not apply. Today I heard someone mention that both B4.1a and B4.1b should be checked.
B4.1b seems to be appropriate since it is for...
