I need to design a pile cap for a single h-pile supporting a steel bridge column.
Seems like all the load from the column will be transferred to the pile below (pile located directly below column).
Since the cap will not take any loads, can I just design a small (say 3ft by 3ft and 24 in...
8 feet of undercut for each tank 150 ft in diameter is resulting in a lot of earthwork.
If calculated over 6-8 tanks, the cost and time for this earthwork is a significant percentage of project cost.
Is there an alternative to "undercut and replace with fill" option that is more cost effective?
Need to resolve as what soil remediation is needed (if any) for a propane tank foundation.
Here is more information:
The site has stiff expansive clays. PVR estimate by geotech is about 4-5 inches (for empty tank condition - less than 1 psi load).
when the tank is half full the load is about...
Decided to do something similar. Weld base plates to the outer edges of the column and anchor it to the footing using bolts. That should transfer the loads to the top and also resist uplift.
DCBII - Agree with you, it's mostly friction between steel and concrete resisting pullout. How do I calculate that value in this case? Any reference?
About the base plate: Not sure why they didn't use a base plate. All I know (based on what I'm told) that they haven't used one.
All: Great pointers from everyone. Thanks so far.
LOKSTR - I will download the report.
Btw, the bridge has been standing for over a year. Hasn't failed in punching yet. My guess is it must be barely passing in vertical punching.
Gravity Loads are as follows:
bridge has a 52 ft span. Loaded with one 16 inch, one 12 inch, one 10 inch, one 8 inch, one 6 inch and a 12 inch cable tray.
supported on combined footing at each end of the span. Total columns is 4.
Gravity Loads per column are (after multiplying by a factor of...
The column is a W 10 x 33.
DCBII: Yes, the column is at rebar level, so there is 3" clear cover between soil and column.
DCBII and Brian: I don't think they used a base plate. I am planning to use ACI 318 APP D - treating the column like a giant bolt with 21 inch embedment; however i don't...
I am evaluating the design of an existing pipe bridge (single pipe layer). Bridge is 20 feet high and 50 foot span.
Contractor did not construct foundation as per design. Instead of constructing pedestal and anchoring the column using anchor bolts, he embedded the bridge column to the bottom of...
@Ron - The phenomenon considered here causing soil displacement is not expansion of the ringwall; instead it is the ringwall being turned inwards due to tank loading (more loading on the inner half of the ring).
I agree that tensile strain is most likely negligible and that should not cause...
