Safety Concepts and Calibration of Partial Factors in European and North American Codes of Practice

Workshop, 30/11 - 01/12/2011

Delft University of Technology, Delft, the Netherlands

	Host Prof. Dr. Michael A. Hicks Geo-Engineering Section Department of Geotechnology Delft University of Technology P.O. Box 5048 2600 GA Delft The Netherlands

	Organising committee Michael A. Hicks (TU Delft) Brian Simpson (Arup) Gordon Fenton (Dalhousie University) Timo Schweckendiek (Deltares / TU Delft) Patrick Arnold (TU Delft)

	Sponsors Supported by the TC 205, TC 304 & ETC 10.

			Details
			Summary Presentations Handout Special Publication on Codes of Practice Pictures List of Participants List of References Links

Last update: 17 February 2012

p.arnold@tudelft.nl

Summary

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The objective of this workshop was to transfer knowledge between European and North American experts on safety concepts and calibration of Codes of Practice. The speakers were asked to describe their national approach as well as the code choices made in terms of design practice, partial factor values and target reliability levels. The overall aim was to identify advantages and limitations as well as similarities and differences between the code approaches and, thereby, to get an overview of the state-of-the-art and to generate ideas for future developments.

A summary describing the outcomes of the workshop can be downloaded here.

Presentations

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Please do not use any of the below presentations in full or in part without contacting the author.

Michael A. Hicks	Netherlands	Introduction to workshop
Gordon Fenton	Canada	Load and Resistance Factor Geotechnical Design Code Development in Canada
Samuel Paikowsky	United States	LRFD Calibration and Implementation of Strength and Serviceability Limit States - Review of Research and Lessons Learned
Adriaan van Seters	Netherlands	The Dutch approach on geotechnical design by Eurocode 7
Jean-Pierre Magnan	France	Implementation of Eurocode 7 in French practice by means of national additional
Brian Simpson	United Kingdom	Reasons for British choices of design approach and partial factors
Beata Gajewska	Poland	Eurocode 7 and Polish Practice
Kerstin Lesny	Germany	Implementation of Eurocode 7 in Germany and consequences for practical
Hansruedi Schneider	Switzerland	Dealing with uncertainties in EC7 with emphasis on characteristic values
Trevor Orr	Ireland	Experiences with the implementation of Eurocode 7 in Europe
Andrew Bond	United Kingdom	Evolution of Eurocode 7

Handout

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The 196 page handout of the workshop presentations can be downloaded here. Please respect the copyright ownership of each presentation.

Special Publication on Codes of Practice

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Following this very successful workshop which compared geotechnical design code experiences in Europe and North America, the organizing committee decided that it would be beneficial to produce a single book containing papers on the theme

"Modern Geotechnical Design Codes of Practice - Development, Calibration & Experiences"

The idea is to provide a single resource that developers of geotechnical design codes, as well as all those trying to understand these codes, can refer to as a guide in the years to come. The book will ideally include proposed future code directions as well as the very valuable information about what did and did not work in current code implementations. We would like input from as many parts of the world as possible to achieve a broad spectrum of experiences in code calibration and implementation.

For more information see here.

Pictures

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Please send an email to Patrick Arnold in order to obtain the pictures in full resolution. This website has been tested using different network browsers (e.g. Opera, Firefox, Internet Explorer). If you experience problems viewing the pictures you might try updating your browser.

List of Participants

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Patrick Arnold	(TU Delft)	NL	p.arnold@tudelft.nl
Frans Barends	(Deltares)	NL	frans.barends@deltares.nl
Andrew Bond	(Geocentrix)	UK	andrew.bond@geocentrix.co.uk
Hans Brinkman	(Deltares)	NL	Hans.Brinkman@deltares.nl
Sébastien Burlon	(IFSTTAR)	FRA	sebastien.burlon@ifsttar.fr
Mark Cunningham	(Shell)	NL	M.Cunningham@shell.com
Jelke Dijkstra	(TU Delft)	NL	j.dijkstra@tudelft.nl
José Estaire	(Geotechnical Laboratory of CEDEX)	ES	Jose.Estaire@cedex.es
Gordon Fenton	(Dalhousie University)	CAN	gordon.fenton@dal.ca
Daniele Festa	(TU Delft)	NL	d.festa@tudelft.nl
Beata Gajewska	(Road and Bridge Research Institute)	POL	bgajewska@ibdim.edu.pl
Geerhard Hannink	(Gemeende Rotterdam)	NL	g.hannink@rotterdam.nl
Michael Hicks	(TU Delft)	NL	m.a.hicks@tudelft.nl
Richard de Jager	(TU Delft/Boskalis)	NL	r.r.dejager@tudelft.nl
Arny Lengkeek	(Witteveen + Bos)	NL	h.lengkeek@witteveenbos.nl
Kerstin Lesny	(University of Duisburg-Essen)	GER	kerstin.lesny@uni-due.de
Mariusz Leszczyński	(Arup)	POL	Mariusz.Leszczynski@arup.com
Marti Lloret Cabot	(TU Delft)	NL	M.LloretCabot@tudelft.nl
Jean-Pierre Magnan	(IFSTTAR)	FRA	jean-pierre.magnan@ifsttar.fr
François Mathijssen	(TU Delft/Boskalis)	NL	F.A.J.M.Mathijssen@hydronamic.nl
Frans Molenkamp	(TU Delft)	NL	f.molenkamp@tudelft.nl
Trevor Orr	(Trinity College Dublin)	IRL	torr@tcd.ie
Samuel Paikowsky	(University of Massachusetts Lowell)	USA	Samuel_Paikowsky@uml.edu
Joanna Pieczyńska	(Politechnika Wrocławska)	POL	joanna.pieczynska@pwr.wroc.pl
Mark Post	(Plaxis)	NL	m.post@plaxis.nl
Wojciech Puła	(Politechnika Wrocławska)	POL	Wojciech.Pula@pwr.wroc.pl
Hansruedi Schneider	(University of Applied Sciences Rapperswil)	CH	hansruedi.schneider@hsr.ch
Timo Schweckendiek	(Delates / TU Delft)	NL	t.schweckendiek@tudelft.nl
Adriaan van Seters	(Fugro)	NL	a.vseters@fugro.nl
Brian Simpson	(Arup)	UK	Brian.Simpson@arup.com
Frits van Tol	(TU Delft)	NL	a.f.vantol@tudelft.nl
Ton Vrouwenvelder	(TNO)	NL	ton.vrouwenvelder@tno.nl

List of References

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The following relevant references have been provided by the speakers. As provided, several papers can be downloaded directly.

A. J. Bond. A procedure for determining the characteristic value of a geotechnical parameter. In N. Vogt, B. Schuppener, D. Straub, and G. Bräu, editors, Proc.: Third International Symposium on Geotechnical Safety and Risk (ISGSR), pages 537–547, Munich, Germany, 2011. download paper

A. J. Bond and B. Simpson. Pile design to Eurocode 7 and the UK National Annex, Part 1: Eurocode 7. Ground Engineering, 42(12):27–31, 2009.

A. J. Bond and B. Simpson. Pile design to Eurocode 7 and the UK National Annex, Part 2: UK National Annex. Ground Engineering, 43(1):28–31, 2010.

G. A. Fenton and D. V. Griffiths. Reliability-based geotechnical engineering. In Keynote lecture in Proceedings of the GeoFlorida: Advance in Analysis, Modeling and Design, pages 14–52, West Palm Beach, FL, US, 2010. download paper

G. A. Fenton, D. V. Griffiths, and X. Y. Zhang. Load and resistance factor design of shallow foundations against bearing failure. Canadian Geotechnical Journal, 45(11):1556–1571, 2008. download paper

G. A. Fenton, D. V. Griffiths, and O. O. Ojomo. Consequence factors in the ultimate limit state design of shallow foundations. Canadian Geotechnical Journal, 48(2):265–279, 2011.

W. Forrest and T. L. L. Orr. Reliability of shallow foundations designed to eurocode 7. Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, 4(4):186–207, 2010.

W. Forrest and T. L. L. Orr. The effect of model uncertainty on the reliability of spread foundations. In N. Vogt, B. Schuppener, D. Straub, and G. Bräu, editors, Proc.: Third International Symposium on Geotechnical Safety and Risk (ISGSR), pages 401–408, Munich, Germany, 2011. download paper

M. A. Hicks and K. Samy. Reliability-based characteristic values: A stochastic approach to Eurocode 7. Ground Engineering, 35(12):30–34, 2002.

M. A. Hicks and W. A Spencer. Influence of heterogeneity on the reliability and failure of a long 3d slope. Computers and Geotechnics, 37(7), 2010.

A. Kisse and K. Lesny. Reliability based design of the foundation of an offshore wind energy converter using the single surface hardening model. In J. Kanda, T. Takada, and H. Furuta, editors, Proc.: 10th International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP10), pages 79–86, Tokyo, Japan, 2007. download paper

K. Lesny. The role of favourable and unfavourable actions in the design of shallow foundations according to Eurocode 7. In R. Luna, Z. Hong, G. Ma, and M. Huang, editors, Proceedings of the GeoShanghai: Foundation Analysis and Design and Innovative Methods, Geotechnical Special Publications (GSP) 153, ASCE, pages 119–126, Shanghai, China, 2006. download paper

K. Lesny. Design approaches of Eurocode 7 and their effect on the safety of shallow foundations. In J. Kanda, T. Takada, and H. Furuta, editors, Proc.: 10th International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP10), pages 129–136, Tokyo, Japan, 2007. download paper

K. Lesny. Safety of shallow foundations - limit state design according to Eurocode 7 vs. alternative design concepts. Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, 3 (2):97–105, 2009. download paper

K. Lesny and S. G. Paikowsky. Developing a LRFD procedure for shallow foundations. In N. Vogt, B. Schuppener, D. Straub, and G. Bräu, editors, Proc.: Third International Symposium on Geotechnical Safety and Risk (ISGSR), pages 47–65, Munich, Germany, 2011. download paper

T. L. L. Orr, A. J. Bond, and R. Scarpelli. Findings from the 2nd set of eurocode 7 design examples. In N. Vogt, B. Schuppener, D. Straub, and G. Bräu, editors, Proc.: Third International Symposium on Geotechnical Safety and Risk (ISGSR), pages 537–547, Munich, Germany, 2011. download paper

S. G. Paikowsky, with contributions by, G. Birgission, M. McVay, T. Nguyen, C. Kuo, G. Baecher, B. Ayyub, K. Stenerson, K. O’Mally, L. Chernauskas, and M. O’Neill. Load and Resistance Factor Design (LRFD) for Deep Foundations. Technical Report NCHRP Report 507, National Cooperative Highway Research Program, Transportation Research Board, Washingon, D.C., US, 2004. download paper

S. G. Paikowsky. Serviceability in the design of bridge foundations. In Proceedings of the International Workshop on the Evaluation of Eurocode 7, pages 251–261, Dublin, Ireland, 2005.

S. G. Paikowsky and Y. Lu. Establishing serviceability limit state in the design of bridge foundations. In R. Luna, Z. Hong, G. Ma, and M. Huang, editors, Proceedings of the GeoShanghai: Foundation Analysis and Design and Innovative Methods, Geotechnical Special Publications (GSP) 153, ASCE, pages 49–58, Shanghai, China, 2006.

S. G. Paikowsky, S. Amatya, K. Lesny, and A. Kisse. Developing LRFD design specifications for bridge shallow foundations. In Y. Honjo, M. Suzuki, T. Hara, and F. Zhang, editors, Proc.: Second International Symposium on Geotechnical Safety and Risk (ISGSR), pages 97–102, Gifu, Japan, 2009a. download paper

S. G. Paikowsky, Y. Fu, S. Amatya, and M. Canniff. Uncertainty in shallow foundations settlement analysis and its utilization in sls design specifications. In Proc.: 17th International Conference on Soil Mechanics and Geotechnical Engineering, Alexandria, Egypt, 2009b.

S. G. Paikowsky, M. C. Canniff, K. Lesny, A. Kisse, S. Amatya, and R. Muganga. LRFD Design and Construction of Shallow Foundations for Highway Bridge Structures. Technical Report NCHRP Report 651, National Cooperative Highway Research Program, Transportation Research Board, Washingon, D.C., US, 2010a. download paper

H. R. Schneider and P. Fitze. Characteristic shear strength values for ec7: Guidelines based on a statistical framework. In Proc.: XV European Conference on Soil Mechanics and Geotechnical Engineering, Athens, Greece, 2011. presented and to be included in volume 4, download paper

B. Simpson. Approaches to uls design - the merits of design approach 1 in eurocode 7. In Proc.: First International Symposium on Geotechnical Safety and Risk (ISGSR), pages 527–538, Shanghai, China, 2007. download paper

B. Simpson. Reliability in geotechnical design - some fundamentals. In N. Vogt, B. Schuppener, D. Straub, and G. Bräu, editors, Proc.: Third International Symposium on Geotechnical Safety and Risk (ISGSR), pages 393–399, Munich, Germany, 2011. download paper

B. Simpson, P. Morrison, S. Yasuda, B. Townsend, and G. Gazetas. State of the art report: Analysis and design. In Proc.: 17th International Conference on Soil Mechanics and Geotechnical Engineering, pages 2873–2929, Alexandria, Egypt, 2009. download paper

O. Tietje, P. Fitze, and H. R. Schneider. Slope stability analysis based on autocorrelated shear strength parameters. In Proc.: XV European Conference on Soil Mechanics and Geotechnical Engineering, pages 1291–1296, Athens, Greece, 2011. download paper

Links

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  Geo-Engineering Section, Department of Geotechnology, Delft University of Technology
  Deltares
  Fugro

  CEN/TC250 CEN Technical Committee 250 (Structural Eurocodes)
  ETC 10 European Technical Committee 10 for the evaluation of Eurocode 7
  TC 205 ISSMGE Technical Committee for Safety and Serviceability in Geotechnical Design
  TC 304 ISSMGE Technical Committee for Engineering Practice of Risk Assessment and Management
  ISSMGE International Society for Soil Mechanics and Geotechnical Engineering
  JCSS Joint Committee on Structural Safety

  Eurocode 7 - geotechnical design Resources to help you get the most out of Eurocode 7
  GeosNET Geotechnical Safety Network to promote, coordinate, and support activities relating to geotechnical safety
  GeoWorld-TC205 Group website of the ISSMGE Technical Committee 205 for Safety and Serviceability in Geotechnical Design
  GeoWorld-TC304 Group website of the ISSMGE Technical Committee 304 for Engineering Practice of Risk Assessment and Management
  Pavia Example's Proceedings of 2nd International Workshop on the Evaluation of Eurocode 7, Eucentre, Pavia, Italy, 12-14 April 2010