Found this on YouTube and looks like all of the faying surfaces are cleaned to the bare metal Link
In our case it was not called by the drawings and out of state erector chose to do it since that's what they always do. I just personally never seen it done before and was concerned with the...
I am looking at 2015 version of D1.1 and its section 5.16, it does specify 3/8" for the weld access holes but nothing for copes other than "Beam copes and cut surfaces in connection materials shall be free of sharp reentrant corners." So 3/8in should probably be a safe minimum for copes on...
It is a 3 story office/commercial building, there are no slip critical connections on the plans. Contractor said they always do it to ensure electrical contact for proper grounding. I've never seen it done before on similar structures and nobody does it on PEMBs either, yet framework is always...
I could not find any code reference to the minimum fillet size when designing coped beams. Which version on the pic below do you guys like more? Those are normally laser or plasma cut from 2 directions, so they rarely match perfect and typically leave some stress concentrators anyway
And sort...
Thanks, I've seen that AISC report, and imagined they would have done more research on the topic since 1997. It specifically mentions highly restrained joints which shear tab is not. Coping the bottom flange of the beam will reduce the capacity, as flexural local buckling becomes a controlling...
Most discussions I've seen regarding welding in k-area were about stiffener plates. Any issues with starting a shear tab weld right from the point of tangency between the fillet and a web?
Also, part 9 recommends 1/2" clearance and I am a little short under the bottom side of the top girder...
@masonrygeek: You probably mean a plain unreinforced CMU, right? I am not familiar with FL practices and mostly deal with commercial projects. After adding rebar, grout and union mason labor, CMU is typically comes up more expensive than RCC. On larger jobs tilt up RCC, PEMB and traditional...
I've seen several DIY ICF projects, CMU on the other hand takes some skill to do right. Renting wall forms like those used for basements and pouring RCC walls might be faster and easier than CMU. Hiring a professional masonry contractor will cost you arm and leg, especially if you want it...
Regardless of reinforcement method, wall has to transmit lateral load to the foundation. In our case bottom cutout was a little larger to allow for a hammer drill, so holes could be drilled into the wall footing under the CMU. Deformed bars were installed into those holes using adhesive anchors...
We had a project a few years back where we had to add reinforcement to the CMU wall. 1970s construction, CMU wall had horizontal durawall mesh, but zero vertical reinforcement. We added fully grouted vertical rebar every 3ft:
3 or 4 CMU faces were cut out along each vertical line, mortar...
I was thinking that pouring thicker equipment pads first is easier and they can also be isolated this way, and subgrade can be on the same level. But keep debating if making the pad isolated and hence much smaller and lighter would do more bad than good.
I really admire pad workmanship on the...
If it is an existing column without known dimensions, column itself can be used as a template to drill holes in the plywood. Then use drilled plywood as a template to secure anchors and leave it in place until concrete is set. Most steel erectors we work with insist on pouring foundation...
Any benefits of isolating those house keeping pads from the rest of the slab with expansion joints? Would isolated pad result in less sound/vibration transferred through the slab to the office space nearby? This is a slab on grade situation.
I see mechanical equipment being installed on top of raised concrete pads all the time. What is the reason those pads are raised? Why not make them same level as the rest of the slab? The one on the 2nd picture appears to be isolated from the floor slab, while the 1st one seems to be not...
Curious if anyone is using isolation joints when cutting in a new patch of concrete? Any code reference to when isolation joints are required? I see them added around interior column pedestals sometimes, while in many other cases slabs are poured right against pedestals.
Dowels will probably not help much. In case of a differential settlement they will simply break out of the existing slab, inspected the worksite today and the slab is only 4" to 5" thick
When adding a thicker, reinforced footing in a middle of the existing PEMB slab, any pros and cons of tying new footing to the old slab with rebar dowels? There is a granular fill under existing slab, and it always makes me nervous, as excavation results in gaps under the old slab around the...
To clarify things, the reason I specified sand + gravel is because trench is crossing concrete pavement. So the trench gets filled with sand first, and then entire area gets gravel/crushed rock before the slab is poured. Slab is subject to heavy vehicular traffic (loading dock area).
Any issues with using gravel on top of sand while backfilling utility trenches containing PVC pipes? Would a geotex between sand/gravel be useful or is it overkill?
