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Hi all, I'm working on a project where a contractor needs to drill holes in a few plywood shearwall bottom plates in order to run HVAC ducts. The bottom plate is 2x6, and the required penetration is about 5", so we can assume the bottom plate is essentially gone for about 12" of shearwall...

Hi All, I am working on a permanent shoring wall that has wide flange piles placed in drilled concrete piers with one row of grouted tiebacks. The shoring wall is about 24 ft tall and piles and tiebacks are spaced at 8 ft in plan. I just received the submittal from the shoring contractor...

Hi all, I am working on a two-story residential project in the Pacific Northwest. The project is typical wood framing spanning to stud walls and plywood shearwalls. In an attempt to save on construction costs, the contractor for the project is looking to reduce the number of shearwalls. His...

Hi all, I am working with an architect that would like to cantilever floor joists from the interior of the house to the exterior in order to form an 8 ft cantilevered deck. I am aware of the thermal bridging and waterproofing issues associated with this, but right now I am trying to convince...

Hi all, I am in communication with a geotechnical engineer regarding the foundation for a two-story, wood-framed residential structure in the pacific northwest. The stem wall foundation will sit on driven pipe piles. We are considering either 4" or 6" diameter steel pipe piles, and have...

I have recently been designing some cantilever beams, and have been thinking more and more about a conservatively enveloped design for cantilevers. My question in short is, to what extent is it standard practice to pattern loads on a given beam in order to achieve the worst case shear/moment...

I am working on a very simple structure for a generator enclosure. It consists of a couple retaining walls that retain 3 ft max, with a slab-on-grade to support a back-up generator for the client's house. The proposed location of the generator pad is very close to the property line, so we've...

Hi all, I am designing a building in a high snow load region, and am hung up on sheathing specifications. The roof assembly is typical, with roof sheathing over manufactured roof trusses. Given the snow load of ~80 psf, the truss manufacturer says that trusses @ 24”oc will work. The roof...

I am analyzing a structural slab that has equivalent steel at top and bottom (As = As'). This creates an issue when computing "a", where a = (As-As')*fy/(0.85*f'c*b). Surely there is a way to calculate the strength of a slab with equal top and bottom reinforcement without "a" going to zero? Any...

I am designing a foundation system on a steep slope in CA where one basement wall needs to retain about 12 ft of soil. Instead of having one huge drilled pier to resist the lateral earth pressure and induced moment, I am trying to design a paired pier system, where the lateral load is resisted...

I am designing a foundation system for a single family residence that consists of drilled concrete piers and grade beams, per the recommendation of the geotechnical engineer. One wall in the basement retains about 8 ft of soil. I have designed a grade beam section for this wall that is about 6...