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Author:
Zacheus Indrawan
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2002-12-18 |
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I need to estimate the settlement of 7 m by 14 m concrete footing supporting a Gas Insulated Switchgear (GIS) Plant due to vibration caused by installation of sheetpiles at 1.5 to 2 m from the footing edge. The footing is founded at 0.5 m depth on loose to medium dense sand (electric cone tip resistance between 4 to 5 MPa)about 5 m in thickness overlying medium dense to dense sand. The sheetpile will be installed using ICE vibratory hammer ICE-428.
I tried to use Prof Massarsch' Method outlined in a paper 'Settlements and damage caused by construction-induced vibrations'. Int Workshop Wave 2000, Bochum, 2000.
Can anybody or Prof Massarsch advise on how to calculate the 'number of equivalent cycles' for such a continuous vibratory hammer. I also have a problem on how to calculate the parameter 'f1' in the settlement formulae.
Many thanks.
Zacheus
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Follow-up:
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Author:
K. Rainer Massarsch
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2002-12-19 |
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Dear Dr. Indrawan,
thank you for your question which I hope to answer as follows:
1. During vibratory driving, the number of vibration cycles will be very large. You should assume a value at, or above the curve for 100 cycles in Fig. 9.
2. The factor f1 gives the relationship between vertical and shear strain. The curves in Fig. 9 were determined based on the laboratory tests by Seed and Youd.
You can start with estimating the shear strain level due vertical oscillation (shear strain = vertical particle velocity divided by the shear wave velocity). Alternatively, you can make a prediction using say 1% shear strain..
If you wish to avoid settlements, you should prescibe a vibration level (particle velocity) which is lower than 0.01% shear strain.
You should verify the settlement estimate by making vibration measurements.
Hope this helps you along.
Regards,
Rainer M.
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Follow-up:
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Author:
Andre Ciputra
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2005-01-15 |
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Hi, Mr Zacheus, merry Christmass and Happy New Year.
Apa kabar pa Zacheus, bagaimana kabar keluarga, sekarang ada dmana di Jakarta atau di Perth?
Sudah lama kita ngga ketemu, saya Andre Ciputra bekas mahasiswa bapak di UKI dan ambil skripsi dengan Daniel Indrawan, msih ingat pak?
Saya ketemu di Auckland dgn ibu Novita Parulian, dan Pa Barita,Pohan,di St Andrew Church...
Bagaimana si Yopie dan Eddy, masih di Multi Ageostecon..
Ok gitu dulu Pak
GBU all.
Regards,
Andre ciputra
andreciputra@hotmail.com
+64 9 278 5727.
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Return
to subject 'Piling'
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Follow-ups:
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Subject:
Settlement due to Vibration - Massarsch Method 