All,
Good afternoon.
I have a precast concrete question regarding a podium style (precast beams, column, and hollow core) for two stories with stick framing above. One column, in particular, was cast too long; the precaster would like to salvage it if at all possible.
The column needs to be...
@Dik, I tried to suggest any kind of segmented steel to the precast client and they did not want to entertain it.
It sounds like the real debate is in the effective width value. After checking in with other engineers and online resources this value widely ranges from 12" to 24"+ (for this type...
@Brad805 & @BAretired: the precaster specifically requested this detail and only does continuous angles for these warehouse structures. Too often are they burned by mislocated joist drawings and needing repairs in the field. It also eliminates all of the costly welding in the field...
Hello All,
I have an insulated precast wall panel with a cast-in-angle with studs to provide support for roof joists (see attached detail). The angle is 6x6x1/2 and is subjected to 11.6k of ultimate shear force. I am trying to determine the bending/thickness of the cont. angle. The joist...
All,
I have a precast client that is looking into ways to optimize the setup of their inverted tee beam process. Currently one of the most labor-intensive processes is stringing each strand through a preassembled cage of stirrups.
The client is asking if they can make the stirrups as...
@Tomfh - on the production tickets we are specifying 3,500psi for f'ci (with f'c=6,000psi). But the precaster informed me this morning their concrete breaks were showing 4,250 psi+.
I'm leaning toward an issue with the strands as well. Just not understanding why some panels are fine, while...
@Tomfh - no sir. Just longitudinal with the length/height of the panel. In my photo above the strands are running left/right (same direction as the cracks) as the panel is being lifted by the jambs/sides.
Thanks for all the responses so far.
@oldestguy: these panels are horizontal cast (on face), 3" wythe being BIF finished face.
@hokie66: these cracks are measuring at 0.25 gauge or 0.01 inch which is classified as "fine/hairline". They wet the panel down to extenuate the crack locations. QC...
Hello All,
A precast manufacturer is seeing some longitudinal hairline cracks coming from the head (top) of the panel extending down about 12"-24". These hairline cracks appear on most of their panels for this specific project (maybe 60-75% of panels).
The panel composition is 3" wythe of...
Thanks for the reply. Since this embed was missed from production, it is likely the insulation was not held back as shown in the above detail. So I have to assume a 4-4-4 section is present at this location. Unless I had the precaster drill some pilot/test holes to check, I suppose that could...
All,
I am designing a repair for a precast concrete manufacturing company where a cast in embed plate was left out during production.
The panel composition is 4" concrete wythe - 4" EPS insulation - 4" concrete wythe (total 12" precast panel).
Panel is designed as a composite panel with wythe...
Glad we are on the same page. I was thinking of something very similar. See below:
Not sure if a fillet weld (as shown) would be correct or not for this type of connection?
And I misspoke earlier, the columns are 16x16 as shown in the detail above.
Thanks again.
Not a concern. Project is in mid-west.
Good question, I can follow up with EOR and verify his intentions.
These columns in particular do not support 1st level members, they extend through the 1st level and just pick up these 2nd floor wide flange members.
Thanks for the replies.
Hello All,
I have a design question for those familiar with precast and steel connections. I am designing the precast concrete for a 2 story podium style mixed use building. On the exterior of the building I have some precast columns which are supporting two wide flange steel beams. These...
MotorCity: thanks for the response. The bleacher is being subjected to overturning and uplift. The slab is not on grade. I am trying to relocate the anchors to a back CIP wall, we will see if I have any luck with the client.
I appreciate the comments.
Hello all,
I have a grand stand bleacher project with an existing 3" concrete slab, the details are showing post installed anchors to secure the angle frame bleacher.
I am running Hilti Profis software and it seems like I can't get a structural anchor to work with less than 3.25" slab. Any...
Not sure if the links below will work or not, but I have attached 2 pdf pages sent directly from the EOR. It appears there is some type of block with a grouted gap between the hollow core and the soil. If we can make this assumption then I guess you are correct. I wonder if I still need to...
