Analysis method of loading test result
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1) Yielding loading result
- Comparison analysis by DAVISSON analysis method, △S/△(logt) - P analysis method, △S/△(logt) - P △S/△(logt) - P analysis, P-S curve analysis as Construction Office Law
2) Limit load decision method
- England Foundation Industry standard (0.1D)
3) Load - Analysis method by settlement curve < Analysis method of limit load >
The method for yielding load and limit load at loading test is that the load P1 of point A of maximum curve of bending foundation curve is yielding load like fig. 1.
(a) of (fig.4-2) is the method by DIN 1504 of Germany CP 2004(Code of practice 2004) of England and sharp moving point of load - settlement curve is limit load.
(b) of (fig. 4-2) is the method by S (1951) and limit load is that gradient of load - settlement curve state changes into straight state.
|
(a)DIN No.1054 |
(b)Schenck method |
(fig. 4-1)Yielding load and limit load | (fig. 4-2) Limit load distinction method by load - settlement curve | |
4) Analysis method by all settlement
A load of pile is related to settlement of pile end and if the load is decided to limit load with setting special settlement of pile, there isn't error of analysis because of having a simpleness and clearness. Therefore this method is used widely but the value of pile settlement is different from country, organization and researcher so there is conflict.
All settlement value(Su) confronting limit load
Application of Country & Organization | [Su](mm) | Safety factor for allowable bearing capacity | Remarks |
Germany / DIN 4014 | 20 |
| - The construction no sensitivity to differential settlement - The construction sensitivity to differential settlement - Large diameter cast in place pile - Small diameter cast in place pile
* D : pile diameter
|
France | 20 |
| |
Czechoslovakia | 15-20 | 2 | |
Austria | 25 |
| |
Netherlands | 25.4 |
| |
New York | 25.4 |
| |
India I.S 2911 standard | 12 | 1.5 | |
TERAZAGH/PECK(1967) | 25.4 | 1.5 | |
WOODWARD(1972) | 12.7-26.4 | 1.5-2 | |
TOUMA/REESE(1974) | 25.4 |
| |
Sobviet Russia Architectural Process Laboratory | 30-40 |
| |
Sobviet Russia Architectural Process Science Laboratory | 80 |
| |
China Road Laboratory (1976) | 40 |
| |
China Beijing Cith Pile Foundation Laboratory (1971) | 15-20 | 2 | |
Japan Old Architectual Academy Standard | 25(yield load) | 2 | |
Japan Soil Engineering(1971) | 25(yield load) | 2 | |
JOHNSON(1973) | < 0.1 D |
| |
England Foundation Engineering Standard (1975) | < 0.1 D |
| |
CAPPER/CASSIE | < 0.1 D |
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