So out of curiosity let's say you have a 24' deep by 33' wide garage with only three 9' openings in the 33' side (18" lugs.) By the tributary method you would need steel moment frames around the garage openings. By a rigid analysis you would likely need nothing. I don't think detailing out a...
MotorCity, Flexible diaphragms probably make more sense for diagonal board sheathing but not for modern OSB such as Advantek, which can be twice as rigid as conventional plywood. But even with plywood diaphragms, the math usually indicates that it is rigid or semi-rigid and hardly ever flexible...
^In my experience the difference can be thousands of dollars on an average large and complicated custom home, and when you are competing with engineers that ignore LFRS almost completely because of lack of understanding, then it makes it tough to compete in an already very cost sensitive...
Despite the popular consensus to design wood diagrams as flexible, in most cases with new construction they are almost always rigid. With irregular shaped buildings the most common method of handling diaphragm horizontal offsets is by using collectors with drag strut connectors to the shear...
The window only effects the shear wall at the upper story, not any of the stories below. You can treat it as a perforated shear wall if you wanted more favorable results. Based on your sketch, assuming the window opening is reasonable (at least 4 ft. of wall on each side), I doubt you will have...
Not sure why the beam can't remain in place and transfer the wall load to the beam in a more creative way, but a sketch would help.
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I reinspected the truss plates again. They definitely failed by teeth pull-out. The wood was in good condition, dry, with no signs of roof leaks. The roof had proper ventilation with ridge and soffit vents. Several other plates on some of the diagonal members have begun to experience plate...
That snow load really doesn't matter since the design Live load is always higher in Charlotte. So even if I was off on my estimated 7 to 10 PCF density of snow, it is nowhere near the 20psf live load the truss is supposed to handle. Besides, there really wasn't a drift issue where the failure...
This past winter Charlotte had a whopper snow storm with almost 6 whole inches of accumulation. I am now looking at my second roof truss failure as a result. Both situations are identical. Churches with scissor trusses spanning 46 feet, both built in the mid-90s. The truss company who did both...
I've specified a silicate sealant before such as Concrete Treat for situations like yours to eliminate the need for a topping slab and membrane. It works great. I probably wouldn't use it on an slab without a roof with heated space below but for an elevated garage, or slab without heated space...
Most framers I've talked with hate using SYP and the few times I framed houses, it was a PITA to work with because it was twisted, knotted, excessively crowned. We never called it out before due to these reasons. We've always used Spruce. The design value changes pretty much reinforce this...
I'm dealing with this right now. The owner wanted the least expensive design drawings possible for a somewhat complicated and unique structure. I told him he was going to need tons of connection details for this job. So I gave him a price to do the job without connection detailing and with...
