Posted in Geotechnical Engineering, Pile Driving Equipment

Vulcan and Sheet Piling —

The development of sheet piling and the Warrington-Vulcan hammers was about the same time (along with concrete piles, other types of steel piles, and the Engineering News Formula.) The years leading up to World War I were ones of rapid development in the marine construction and deep foundation industries, and Vulcan was in the middle […]

Vulcan and Sheet Piling —
Posted in Deep Foundations, Geotechnical Engineering, Pile Driving Equipment

Reconstructing a Soviet-Era Plastic Model to Predict Vibratory Pile Driving Performance —

The latest in our series of monographs on vibratory pile drivers, this one takes us back to the beginnings of vibratory pile driving in the Soviet Union. It was prepared for the ReSEARCH Dialogues at the University of Tennessee at Chattanooga in April 2021. The vibratory driver that started it all: the Soviet BT-5, used […]

Reconstructing a Soviet-Era Plastic Model to Predict Vibratory Pile Driving Performance —
Posted in Deep Foundations, Pile Driving Equipment

Concrete Pile Head Response to Impact

Our newest research item is this one, which is an expansion of the work with steel piles earlier this year. Abstract is as follows:

The application of semi-infinite pile theory to the behaviour of driven piles has been studied since Parola (1970). Most of the effort, however, has been concentrated on piles which do not require a cushion between the pile head and the pile driving accessory, such as steel piles. Concrete piles, on the other hand, are generally driven with this additional cushion. In this paper the same type of semi-infinite type of analysis is applied to this problem. Both the case of a rigid pile head and a pile head which responds without reflection from the pile are studied using both closed-form and numerical solutions. Two case histories are included which illustrate the application of the method, along with parametric studies of both pile head conditions.

You can download the paper here, or go to Researchgate to do so.

This is a new paper to update and expand on part of the first technical paper presented by a Vulcan employee: the paper “A Proposal for a Simplified Model for the Determination of Dynamic Loads and Stresses During Pile Driving,” originally presented at the 1987 Offshore Technology Conference. The abstract is here: Warrington (1987) was […]

via OTC 5395 Revisited: Analysis of Cushioned Pile Hammers —

OTC 5395 Revisited: Analysis of Cushioned Pile Hammers —

Posted in Pile Driving Equipment, STADYN

STADYN Project: Some GRLWEAP Screen Shots from the Original Project

While looking through some files, I found these from the original STADYN project, from the comparison case with GRLWEAP.  I’m passing these along to give you an idea of the graphical output of this program.  My thanks to Jonathan Tremmier of Pile Hammer Equipment for allowing me to use this copy of GRLWEAP.

Screenshot 2015-10-19 11.18.08
This is the “main screen” of GRLWEAP, giving a schematic view of the hammer/pile/soil system and allowing for input of parameters.

Screenshot 2015-10-19 11.18.32
This is the “bearing graph” output of the program, also giving a graphical representation of the system.

Screenshot 2015-10-19 11.19.06
This is the force-time and impedance*velocity-time trace for the pile head. Comparing the two is an important element when this data is gathered in the field.