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Hi all, As part of a project in an existing manufacturing facility, the wastewater system is being upgraded. As part of this, (3) new 8-ft deep lift stations are being installed within the existing facility. We will be sawcutting and removing the existing concrete slab-on-grade, then excavating...

Hi all, I am working on a project involving a new masonry building with a steel beam and metal deck roof system. My original design called for tapered roof insulation to achieve a 1/4"/ft roof slope to drains (see attachment of roof structure layout). The cost came back incredibly high, and the...

Hi all, I am currently working on a bracing design for a rectangular, above-ground wastewater tank which is already in place. New stainless steel tubes (acting almost entirely in tension) are being installed to brace the tank walls. Due to the high tension loads (ranging from 40-kips to...

Hi everyone, For a project I am working on, there are a few skids which hold compressors and blowers and are located indoors. The anchorage system specified were post-installed epoxy anchors. The contractor is having some issues getting these installed, however, as the top flange on the skids...

Hi everyone, A coworker of mine recently ran into an issue on a project where a new metal building with shallow foundation system is to be installed over what used to be a lagoon, but which has since been filled. Recently, it was just discovered that an 8" concrete slab was left 8'-0" below...

Hi everyone, A colleague of mine recently submitted calculations provided by a bolted steel tank manufacturer to the DNR for permitting review. The tank design followed AWWA code, but the reviewer commented back, "The digester vessel structural calculations reference AWWA D103 as a basis of...

Hi all, I am working on a project where I received some column loading from a prefabricated metal building supplier, and I just need to design the building foundation system. Due to the client requesting no interior columns for a 75'-0" clear span, the loading coming in from these columns is...

Hello all, I am currently designing a large underground cast-in-place stormwater collection structure. The roof of the structure consists of a 27" concrete slab which spans to concrete walls on two sides and to two concrete beams (which connect to the walls on each end) on the other sides...

Hello, I need to design three reinforced concrete supports (9" thickness, 6'10" length, 2'6" height) to hold up a centrifuge, the supports are spaced 50" and 140" apart. The resonance frequency of the centrifuge is in the 3-8 Hz range and I need the substructure to have a rating in which the...