For our Dam Safety Inspection & Hazard Analysis Reports we include a Potential Failure Mode Analysis(PFMA), a.k.a. Failure Mode & Effects Analysis (FMEA). Part of developing the PFMA usually includes a round table discussion involving a representative from the various applicable involved parties...
I'm trying to wrap my head around something and I can't quite figure it out.
Say I have an 8' diameter precast manhole that is 36' deep with 8" thick walls (Just pulled numbers out of the air). The manhole will be comprised of a 5'tall base section, six 5'tall riser barrel sections and a 12"...
I did bring up the issue with the engineer but it was just dismissed and swept away. In any case, if these start cracking, it'll be on the engineers. There's an independent QA firm for this job making sure everything is done "correctly".
If anyone is interested, here's a picture of one of the panels just before concrete is to be poured. The panels are match casted by the way.http://files.engineering.com/getfile.aspx?folder=a4190da8-b853-42d5-a8e5-f397ba76874e&file=photo.JPG
The post-tensioning rods run longitudinally. Two - 85ft long rods run the entire bridge length inside the PVC ducts.
Now, I was thinking about why such a large duct would be needed. We fabricate our own steel forms and use a (+/-)1/16" tolerance, so misalignment of the ducts wouldn't be an...
Lap splice spec was just for the reinforcing bar, not for the post-tensioning
Since i'm home now, off the top of my head, I know the engineer's plans stated that the bridge is designed to support H-25 loading and a 65 Ton crane...
Oh and originally the plans called for 17 - 5' wide panels with 9.5" wide panel on each end (hoops would be in 9.5" wide panels). We asked the engineer to modify the design so instead there would be 15 - 5' long panels and a 5'-9.5" panel on each end. We were afraid the 9.5"long x 15'wide x...
This is my first post-tension project by the way.
To clarify I think, there are no integrated tensioning anchorages. Its just panel w/pvc duct through it. Two end panels have this hoop reinforcing around the duct (specified 4 hoops per PVC end so 8 per panel, and 16 total). The tensioning rod...
I didn't design the panel system, I just work for the Precaster who will make it. Engineers provide us with rough drawings and specs and then we need to provide then with detailed production drawings for approval.
Bridge deck is 15' wide. The panels are 8" thick. They want 1.5" of cover for the...
I'm work for a precast concrete manufacturer. I'm drawing up some production plans for full-depth post-tension deck panels. The post-tensioning runs through 3" Dia PVC Ducts(3.5" O.D.) that will be cast-in of course. At the End Panels the engineer has specified that there be these #4 rebar hoops...
I've got a guy doing takeoffs for a stormwater system and he's come across an acronym that i'm not familar with for some of the piping between drainage structures. The plans are calling out for SICPE.
Is this the same as Corrugated HDPE/ADS N-12?
