H Pile to Pile Cap Connection
H Pile to Pile Cap Connection
(OP)
I have typically specified the connection of steel H piles to pile caps to be 6" embedment. The question that has always stuck in my mind is: How does one analyze the connection? A quick check of the bearing of the concrete on the area of steel alone typically gives a stress that exceeds the allowable bearing stress of the concrete? Thoughts???






RE: H Pile to Pile Cap Connection
Refer to Research Report No. 1, "Investigation of the Strength of the Connection between a Concrete Cap and the Embedded End of a Steel H-pile", State of Ohio Department of Highways, 1947. More recent investigations have also confirmed the Ohio test results.
It is ultimately your choice to conservatively use a cap plate or analyze the research.
RE: H Pile to Pile Cap Connection
RE: H Pile to Pile Cap Connection
http://www.slideruleera.net/Steel-Piling.html
In this 1960's edition of the book the information that jike refers to is on pages 40 and 41.
www.SlideRuleEra.net
RE: H Pile to Pile Cap Connection
1) "The elimination of the cap plate facilitates placing concrete around the embedded end of the pile and aids in achieving a better density of concrete in that region of the pile cap".
2) "Steel compression piles embedded a minimum of 6 inches and with minimum edge distances recommended in Table 2 do not require steel cap plates or any other auxiliary bearing device". (Table 2 shows minimum edge distance from center of pile to face of pile cap = 12" for working load less than 110 tons, 16" for 110 to 140 tons, 21" for more than 140 tons).
3) I have an old (1987) copy of NYC building code that said "Cap plates will not be required for steel H piles embedded in a reinforced concrete cap".
RE: H Pile to Pile Cap Connection
So what does that have to do with a pile? - well, the reason we don't have little holes all over are floors is that either 1. not too many 300lb ladies wear high heels or 2. the combined effect of concrete confinement and very localized forces greatly increase the allowable capacity bearing capacity of concrete at the point of load application by allowing it to comfortably redistribute within the surrounding area.
RE: H Pile to Pile Cap Connection
RE: H Pile to Pile Cap Connection