Recent content by WWTEng

Picture is attached, although you can't tell that the foundation has tilted.https://files.engineering.com/getfile.aspx?folder=eea8bfd4-b4f9-4c22-825e-44284ad2ff59&file=20240801_125929.jpg

Hello, I have a situation where a steel column (exterior, W12) is leaning due to the foundation heaving about 3/4". The foundation is at least 30 years old, so is the steel. I guess the issue was recently notice by the facilities. In order to correct the issue "temporarily", the site crew...

BA, I think you are correct. That appears to be a reference to horz reinforcement.

Thank you all. @BA, just checked the drawings again. Built in 1972, in Chicago. The drawings show "Wall reinforcing every second block course". Which likely means grout @ 16" oc.

I am looking at a 12" cmu wall from 1970s. The drawings appear to show the wall grouted @ 48" oc. I am trying for find some fire rating dates for CMU from that era but not finding anything. What be a good resource for this information? Thank you.

Is there a load chart available for using these F1554 anchors as welded studs to a plate? Thank you.

I am looking at aprox 13' tall exterior CMU wall. Non-load bearing. Of course it will have to resists lateral loads (likely wind, since its Michigan). Before I start designing in detail, are there any cmu max height requirements for a cantilever wall? Thanks,

Single story masonry building with precast roof. Wall height aprox 15', 8" cmu. My question is about putting the roof (precast planks) on the wall once the wall is complete. How long should the contractor wait before placing the loading the wall with planks. Thanks.

Consider a 3'x12' deep pier foundation supporting an out door structural column. The contact tor was supposed to pour a pipe within the concrete. The contractor forgot to do that. They are recommending digging down to one side of the pile 9' deep to install the pipe and fill the void with grout...

What exactly is a Smart Grid?

JAE. Thanks. My structure is concrete so I think I should be able to go 232' w/o a joint.

190'x232' sports arena (single story). Roof is metal deck on steel trusses. The structure itself is concrete a frame (columns wand beams). The temp range is 90 F. But the project is an area where air-conditioning (heat and cooling) may not be functional. I can't decide if an building expansion...

Is Asymmetrical SC ever used in design? My understanding is that bus work as well as ground grid is designed for Symmetrical only.

Thanks Bill. Is SC force always horizontal (and perpendicular) to the bus? And typically of the three phases, does it develop only in two?

Consider a 138kv system with 4" bus for each phase (attached example). In which direction do the SC forces on each bus act? I am trying to figure out if any SC forces will make their way to the foundation or if they cancel out at the beam. Talking to one engineer, he mentioned that the SC forces...