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Reliability-Based Code Calibration for Axial Ultimate Bearing Capacities of Single Bored Piles in Taipei Basin

Published online by Cambridge University Press:  05 May 2011

J. Y. Ching ,
H.-D. Lin  and
M.-T. Yen
J. Y. Ching*
Affiliation:
Department of Civil Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C.
H.-D. Lin*
Affiliation:
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, R.O.C.
M.-T. Yen*
Affiliation:
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, R.O.C.
*
*Associate Professor
**Professor
***Graduate student
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Abstract

In Taipei, many pile proof load tests were not conducted to failures but only to a multiple (e.g., 2) of the design load. This leads a difficulty of incomplete information: For these test results, the ultimate bearing capacities of the test piles are unknown. This paper addresses the issue of calibrating resistance factors of piles for the axial ultimate bearing capacities based on the incomplete information from these tests. A simplified probabilistic method is proposed to resolve this issue. A local pile test database of Taipei is presented, and the analysis results show that the inclusion of the incomplete pile load test data helps in calibrating the resistance factors. Moreover, it is found that the calibrated resistance factors for the axial ultimate bearing capacities are consistent to the safety factors that are adopted in the current Taiwan design code. This paper also addresses another important issue for the pile design in Taipei: the end bearing capacity in the sandstone layer is very uncertain. A maximum likelihood method is taken to identify the best estimate for this end bearing capacity. The conclusion of this paper may be useful for reliability-based designs for the axial ultimate bearing capacities of single bored piles in the Taipei region.

Keywords

PilesLoad testsReliability-based designResistance factorCode regulations.
Type
Articles
Information
Journal of Mechanics , Volume 25 , Issue 4 , December 2009 , pp. 389 - 400
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2009

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References

REFERENCES

1.Barker, R. M., Duncan, J. M., Rojiani, K. B., Ooi, P. S. K., Tan, C. K. and Kim, S. G., Manuals for the Design of Bridge Foundations, NCHRP Report 343, TRB, National Research Council, Washington, DC (1991).Google Scholar
2.McVay, M. C., Birgisson, B., Zhang, L. M., Perez, A. and Putcha, S., “Load and Resistance Factor Design (LRFD) for Driven Piles Using Dynamic Methods—A Florida Perspective,” Geotech. Test. J., 23, pp. 55–66 (2000).CrossRefGoogle Scholar
3.Paikowsky, S. G., Birgisson, B., McVay, M., Nguyen, T., Kuo, C., Baecher, G., Ayyab, B., Stenersen, K., O'Malley, K., Chernauskas, L. and O'Neill, M., Load and Resistance Factor Design (LRFD) for Deep Foundations, NCHRP Final Report 507, Transportation Research Board, Washington, DC (2004).Google Scholar
4.Davisson, M. T., High capacity piles. Proceedings, Lecture Series, Innovations in Foundation Construction, ASCE, Illinois Section (1972).Google Scholar
5.Ng, C. W. W., Yau, T. L. Y., Li, J. H. M. and Tang, W. H., “Behavior of Large Diameter Floating Bored Piles in Saprolitic Soils,” Soils and Foundations, 41, pp. 37–52 (2001).CrossRefGoogle Scholar
6.Zhang, L. M., Shek, M. P., Li, P. H. and Ng, M. Y., Development of a Hong Kong Driven Pile Database. Internal Report, Dept. of Civil Engineering, Hong Kong University of Science and Technology, Hong Kong (2003).Google Scholar
7.Zhang, L. M., “Reliability Verification using Proof Pile Load Tests,” ASCE Journal of Geotechnical and Environmental Engineering, 130, pp. 1203–1213 (2004).CrossRefGoogle Scholar
8.Ching, J., Lin, H. D. and Yen, M. T., “Calibrating Resistance Factors of Single Bored Piles Based on Incomplete Load Test Results,” submitted to Geotechnique (2008).Google Scholar
9.Chen, J. R., Axial Behavior of Drilled Shafts in Gravelly Soils, PhD thesis, Cornell University (2004).Google Scholar
10.Moh, and Associates, Engineering Properties of the Soil Deposits in the Taipei Basin, Report No. 85043, RetSer Engineering Agency and Taipei Public Works Department, Taipei (in Chinese) (1987).Google Scholar
11.Chen, D. S., “Pile Types, Bearing Capacity and Mechanisms — Considerations in Construction,” Publication D19, Taiwan Construction Research Institute, pp. 1–33 (2000).Google Scholar
12. TGS, Taiwan Geotechnical Society Foundation Design Code for Building, Taiwan Geotechnical Society (TGS), Taipei (2001).Google Scholar
13. DM 7-2 Foundations and Earth Structures — Design Manual 7.2, Department of the Navy Naval Facilities Engineering Command, Alexandria, VA (1982).Google Scholar
14.Whitman, R. V., “Evaluating Calculated Risk in Geotechnical Engineering,” ASCE Journal of Geotechnical Engineering Division, 110, pp. 145–188 (1984).CrossRefGoogle Scholar
15.Ang, A. H. S. and Tang, W. H., Probability Concepts in Engineering Planning and Design, Volumn II Decision, Risk, and Reliability, John Wiley and Sons (1984).Google Scholar
16.Lin, H. D. and Lin, C. P., “A Preliminary Study on Resistance and Load Factors for Drilled Piles,” Journal of the Chinese Institute of Civil and Hydraulic Engineering, 11, pp. 13–21 (1999).Google Scholar
17. AASHTO, AASHTO LRFD Bridge Design Specifications, 4th Ed. American Association of State Highway and Transportation Officials (AASHTO), Washington, D.C (2007).Google Scholar
18.Lin, H. D., A preliminary study on load and factors for foundation piles in Taiwan, Invited lecture, Proceeding, International Symposium on New Generation Design Codes for Geotechnical Engineering Practice-Taipei 2006 (with CD-ROM), World Scientific Publishing Company (2006).CrossRefGoogle Scholar
19.Phoon, K. K., Reliability-based Design of Foundations for Transmission Line Structures, Ph.D. Dissertation, Cornell University (1995).Google Scholar