Working on a wastewater plant and I have required Type II cement. The contractor is asking for an alternate. I'm not comfortable requiring specific admixtures to achieve the same sulfate resistance with Type I/II or IL. There may be something in ACI 350, but I am not sure where to look. Any...
GC - you are right. I am not really concerned about the structure. It is really a concern about the potential for the exterior to crack. As you know, it is pretty difficult to explain to the owner that concrete cracks are not a structural issue. Good thoughts on quality control.
Josh -...
Working on a big manufacturing facility that will utilize tiltwalls as the gravity/lateral load system. We will be using a formliner. The architect is wanting to use a vertical pattern - 2 inches deep spaced at 4" oc +/-. The structural thickness will be 7 1/4" - total 9 1/4". My concern is...
I am working on a wastewater treatment plant and I currently have galvanized steel I-beams shown to support some of the grating and diamond checker plating covering a coarse screening structure. The environment will be corrosive, especially in this part of the plant. I have used galvanized...
I am working on a project that will require some moment connections. The architect is wanting to use pipes, but the horizontal framing is rectangular tubes. Anyone have experience creating fixed connections between pipe and tube?
I do specify the Fb and E on the drawings. I try to give myself a little wiggle room when doing the calcs in case a lower strength LVL is delivered. If I am right at the allowable stress, I would consider bumping up the size. Rarely an issue, as I am normally increasing the size due to...
I also rarely run into bending stress problems with LVL's before I have deflection issues. I could see it for a deep LVL that has a long unbraced length. What is the room being used for? Can you get away with using 30 psf?
We have been working on WWTP's (basically a bunch of giant concrete tanks) over the past couple of years, and I am beginning to question how I have detailed some of the concrete joints. I have been requiring PVC waterstops (chemical resistant) on the OUTSIDES of the reinforcing steel (water...
We have a project coming up for a developer in Arizona that will require a vehicular bridge. We have done many bridges in Texas, but no experience in Arizona. I have looked through their (ADOT) website in search of CAD standard drawings for bridges, and have not found much. Does anyone have...
Has anyone ever worked on a project involving shipping containers? I have a potential project that will involve stacking a series of these to create a building. There will be openings that are cut into the walls. I'm curious about how these are framed and if anyone has any other pitfalls to...
I'm working on a 2-story building project, and the architect is wanting to use an unconventional wall system. It is a combo 4-inch cmu, grout (2-inches) core, and brick. All would be tied together with wire ties. I don't like the idea, primarily because I'm unfamiliar with this kind of...
Well I don't want to add anything if it's not necessary. There is no negative moment here - beam is simply supported. I think I tend to be conservative when it comes to LTB. This is a roof beam and it will have a metal deck on top. I suspect we'll puddle weld. Just wasn't sure if I could...
I've got a project where a big I-beam is required. I routinely try to frame secondary framing into the web of the primary I-beams to reduce the unbraced length of the beam. But I've got an issue where the depths are not close. A W27x84 and smaller "joists" - W16x26. I don't want to increase...
I am working on a spillway project for a pretty big dam. I am struggling with rationalizing some of the loads that will be present on the spillway channel bottom. The dam is clay (an "impervious" layer of soil covered by concrete slab), and I do not believe that we will have uplift due to...
