Hello,
I have an existing strip/office w/ K-Series joists @ 6’oc w/ 20ga B deck (20/20 loading). Needs new 280# EF w/ 24x24 curb opening for 40” diameter exhaust. My question is with this size of opening/relatively limited weight is there an ideal installation for the deck reinforcing? I’m...
Hello,
I'm analyzing a 120,000sf factory floor, 2VLI 8" total thickness, that appears to be built for WWIII for a new piece of machinery. It was constructed as an addition with W24x55s @ 6'-3" o.c. x 30' w/ W33 Girders spanning 25'. The steel is fireproofed and from historic Google Satellite...
Hello,
I'm designing a house where the architect wants "open concept" living for the owners. This has resulted in a 4-ply 16" LVL spanning 24' picking up 30psf LL from 2 upstairs bedrooms and part of a hallway. The LL on the beam amounts to an incredible 11,000 lbs, where I've justified a LL...
Hello,
I’m evaluating a detail from a Simpson blog where the hold-down uses a threaded rod extension and coupler nut. Like every hold-down foundation detail I’ve examined the post/chord is setting directly on the sill. My question is can the SW posts set on the floor instead (sole plate, floor...
Hello,
I am looking to install a 26 gauge metal ceiling diaphragm with trusses spaced 4'-0" o.c.. My question is do the trusses require 2x4 purlins at the underside of the trusses for panels to attach to or can the panels attach directly?
One of the pole barn manufacturer's says additional...
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I am looking at designing a field welded single-angle connection for a lightweight wide flange to an embed plate, where I understand the recommended design is to weld only the toe and the bottom of the angle as an eccentrically loaded weld group allowing a pinned connection...
Hello,
I am analyzing a new barn with long-span trusses having no records of the design. The field verified chords are 2x8 SP 2400F with very large pressed plates, which makes me believe they were designed for considerable loading. However, according to my analysis, the bottom chords and...
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I am using RISA to design concrete beams and am comparing/verifying the analysis (moment capacity, shear capacity, & deflection) with CRSI. Does anyone have any experience with RISA-3D for concrete design and how the results may differ from other designs. Thank you,
Hello,
Comparing results of 318 software analysis with prescriptive design from ACI 332 Residential and the IRC. A couple items have come into question: 1) 318 requires 2 curtains of verticals, 332 requires only 1 on the tension side - I take it this is related to 322 pinning the basement wall...
Hello, has v19 addressed any of the speed issues? Or is the software architecture altogether to blame and not just the interface. I upgraded to v18 a while back and “cancelled my subscription” after trying to model a simple structure. I emailed corporate to make sure they wouldn’t renew. “R” was...
Hello,
I'm working on the structural design of repairs for 1960s era Macomber joists. Where joists have had the bottom chord rotated due to a lack of bridging, I'd like to design new bridging to restore the stability. The manufacturer's catalog has a preferred detail with welded 1/2" diameter...
Hello, I am working on a restaurant with a flat roof (1/4" per ft.) that slopes front to back. At the front/rear, the parapet is currently detailed in a platform manner with a continuous sill plate, vert studs, and kickers @ 32" o.c. My question is for the side walls parallel to the sloped...
Hello,
I see great information on here for Macomber joists, including the original catalogs. My question is what about repairing them? What are some of the things to look out for - looks like these are cold formed. The type I am working with are the prototypical ones used in the LOGO . Looking...
I have a 90x60 flat roof restaurant with a 40' span and (2) 25' spans. Since the ARCH is going with 3/4" plywood (instead of the customary 5/8"), is there a benefit to a 2'-8" c/c max. truss spacing, particularly for the long span or are there pitfalls? It seems like cutting down the pieces &...
