pile cap design - steel H piles

[posti]

Constrado publication 2/74 (steel bearing piles)suggests that there is no need to introduce specific head details - cap / dowel etc if the pile is embedded 150mm into a properly designed pile cap.
This advice is based on some resarch by Ohio in 1947, and assumes compressive load only.
Is there any other information on this subject - possibly more recent?

 

[PEinc]

Pile Design and Construction Practice, Fourth Edition 1994, by M. J. Tomlinson addresses this connection. See Section 7.7, Page 280.

Tomlinson says that "Steel box, tubular, or H-section piles carrying only compressive loads, can be terminated at about 100 to 150mm into the pile cap without requiring any special modifications to the pile to provide for bonding (Figure 7.7a). There must, however, be a sufficient thickness of concrete in the pile cap over the head of the pile to prevent failure in punching shear. Research by the Ohio Department of Highways (the same 1947 Ohio reference you noted) has shown that if the concrete forming the pile cap is of adequate thickness and if the reinforcement is correctly disposed to withstand shearing and bending forces there is no need to provide a bearing plate or other device for transferring load at the head of an H-pile." Figure 7.7c shows rebars in two directions going through "closely-fitting drilled holes" in the top of an H-pile for an "H-pile carrying uplift loading or bending moments."

 

[fndn]

This one topic where many foundation textbooks sadly just don't cover. Teng's "Foundation Design" 1962 covers it very well. You can get the plan dimensions from CRSI Desig Handbook 2002, and may get more structural design in a Structural Engineering Handbook like the one by Gaylord.

"Handbook of Concrete Engineering" by Fintel 1974 has 4 page illustration as well. Here is more recent link:

http://www.pwri.go.jp/eng/ujnr/tc/g/19bws/pdf/4-3shirato.pdf