Pile Driving Analysis by the Wave Equation
1) Watch an introductory video regarding Wave Equation Analysis for driven offshore piles by clicking here. You will probably want to download the corresponding class notes to follow the video discussion. Click here for the class notes. Also, please read through the classic paper on Pile Driving Analysis by the Wave Equation by E.A.L. Smith. Click here for Smith’s paper.
Notes for class 1:
The appropriate time interval for use in different materials, with a pile segment length around 8 to 10 feet, is given in Smith’s paper. See page 1165.
Total number of time intervals to run ~ length of pile * 4 (up and down twice) / (speed of wave * time interval used). So for a 500 foot long steel pile:
= 500 feet*4/(16,700 ft/sec * (1 sec/4000 iterations))
~ 500 iterations
You will note me messing around looking for information in a couple of tables in the video. These tables are listed in the Data and Help files below.
Notes for class 2:
Click here for homework assignments: Note, this is a .doc file so look for Word to try and open it. Due dates are listed below:
Part 1 is due on 3/1/19 – Please email your solution in a SINGLE DOCUMENT to Lowery@tamu.edu using “CVEN 686 Pile Driving Homework Part I” as the subject line. Multiple file reports will be discarded. If you haven’t been able to get with me to answer questions, I will take them a few days late without penalty until we can set up an appointment. L^3.
Part 2 is due on 3/22/18 – Again, please email your solution in a single document to me using CVEN 686 Pile Driving Homework Part II as the subject line.
Just added for Problem 2: Maximum number of pages of computer output is 10. If you send those, a few from the beginning and a few from the end, I will be able to see what you ran and what you got as results, which is all I need.
How to make everything into a single document – in the worst case, simply print out a hard copy of your problem input and computer output in text format, hard copy. Then print out your .doc files describing your report as a .doc file, hard copy. Then make .pdf files out of any sketches and drawings you made. Finally, put all that paper in order and run it through the printer, resulting in a .pdf single document and turn that in.
Ready to try the program? See “The Microwave Programs” below, under Student Resources
MICROWAVE – A computer program to study the behavior of piles during driving
Written by: Lee L. Lowery, Jr., PhD, P.E.
Department of Civil Engineering
Texas A&M University
College Station, Texas 77843-3136
The Microwave Program: MW88_64bit.exe
The original Fortran file: MW87.for
The original Fortran file with .txt extension to try
and get it to transfer over internet: MW87.for.txt
ADDITIONAL STUDENT RESOURCES:
Data and help files
- Hammer data Notes on hammers
- Helmet data An overview of pile driving equipment
- Cushion properties
- Blank input calculation forms (PDF)
- Typical pile model
- Input Forms (XLS) for printing only – these will neither run nor form data sets.
- Example input data set for printing only – will not run or form data sets
- Example output set for something (ASCII text file)
- Problem to work in class
- Appendix A – Parameter Definitions
Computer programs for running the wave equation:
- Get from professor in class on a thumb drive.The Microwave programs zip file and other supporting programs including Editpad and DOSBox. Note: Do not left-click on this link. Right click on it and then click on “Save Target As”. Then save it in a folder on your hard drive, or on a thumb drive. It will save 686wave.zip in your folder or thumb drive. Then go to that folder and double-click on 686Wave.zip. It will make a “686Wave – Copy” folder with the files in it. Double click on that folder to access the files. Then copy those files and folders to a working folder of your choice, I suggest C:\686Wave. Microwave (MW88.exe or MW87.exe – both the same) and other useful programs are in there, including Editpad (an ASCII editor for generating datasets) and DOSBox (a 32 bit program emulator. You should also put your data in that folder and run everything from there.
- MWMANWRD.doc – This is a Microsoft Word version of the user’s manual, including all figures. Simply right-click on this file, click on “Save Target As”, and put it in a folder on your computer.
- MWMANUAL.htm – HTML version of the user’s manual.
- MWMANUAL.pdf – The user’s manual in pdf format, courtesy of Don C. Warrington who maintains an excellent site regarding pile driving analysis by the wave equation – a must read for serious practitioners. Don also has written an excellent paper regarding a closed form solution to limited cases for the wave equation.
- How to DOSBox – How to run Microwave (MW87.exe) using DOSBox, and a video on its use. No longer needed. Run 64 bit program.
- DOSBox – They also have Mac OS X, and other versions. Take your pick. The only one I have above is for Windows. DOSBox is necessary to run the wave equation when using 64 bit computers. Click on “Downloads” to download the DOSBox installer you need. Put it in a known directory on your hard drive. Then run it from there. I would suggest that you make a directory on your hard drive called “C:\686Wave”. Put the DOSBox installer there, and download the MW88.exe program and all of your data files there. It makes it far easier to run everything. No longer needed. Run 64 bit program.
- EditPad Lite – An excellent free ASCII text editor useful in forming wave equation input data sets, and reading resulting output.
Hammer information sites:
- Don C. Warrington’s excellent site http://www.vulcanhammer.info/drivability/#wave
- The original E.A.L. Smith paper: Pile-Driving Analysis by the Wave Equation, ASCE Paper No. 3306, Vol. 127, 1962, Part I
- The original Samson, Hirsch and Lowery paper: Computer Study of Dynamic Behavior of Piling, ASCE Paper No. 3608, Aug. 1963
- Lowery’s dissertation: Dynamic Behavior of Piling, Texas A&M University, May 1967
- A Comparison of Dynamic Pile Driving Formulas with the Wave Equation – 1968
- Driving Practices for Prestressed Concrete Piles – 1966
- Impact Load-Deformation Properties of Pile Cushioning Materials – 1966
- Pile Driving Analysis – State of the Art – 1969 – THE User’s Manual for running MW87, Pile Driving Analysis by the Wave Equation
- Applications of Wave-Equation Analysis to Offshore Pile Foundations – OTC Paper 1055 – 1969
- Increasing the Ability to Drive Long Offshore Piles – OTC Paper 1064 – 1969
- Jonggeun Choe and Hans Juvkam-Wold Paper on Bottom-Hammering of Piles
- Pile Drivability Analysis – Fenske, Carl S. and Hirsch, T.J. What happens when you hit sand lenses?
- 8th International Conference on the Application of Stress Wave Theory to Piles
- Application of Stress Wave Theory to Piles One of a series.
- Driving pipe piles – potential for plugging during driving, page 74
- Prediction of soil resistance on piles during driving at Exxon’s Hondo Platform in Santa Barbara Channel
CVEN 686 – Historical Papers – Note: These papers were collected back in the 60’s for use in research on pile driving. If you are the author of any of these papers and feel that it should not be included for student use in this historical summary, please email me at Lowery@tamu.edu and I will remove it.