Contributions to Proceedings:
D. Adam, M. Fross, R. Hofmann:
"Pile Foundations for River Bridges according to EC7-1";
in: "Proceedings of the XIVth Danube-European Conference on Geotechnical Engineering",
issued by: TU Bratislava;
Bratislava, Technical University,
Eurocode 7 Part 1 was published in Austria as ÖNORM EN 1997-1 already on
May 1st, 2005, once more in an improved German language version on January 1st, 2006. On
May 15th, 2009 a consolidated version was publishes including Corrigendum (AC) which was
sent out by CEN in February 2009.
The National Annex (NA) to EC 7-1, called ÖNORM B 1997-1-1:2007-11-01, gives guidance
how to apply EC 7-1 in Austria. For the design of pile foundations an additional standard
ÖNORM B1997-1-3 is now being prepared by the responsible national committee and shall
be published soon.
The coexistence period of old geotechnical standards based on a global safety system
parallel to Eurocodes ended in Austria by June 2009. Therefore specific case histories of
projects designed according to Eurocodes, especially to EC 7-1 are not yet available.
The authors of this paper were dealing with several river bridge foundations using large
diameter bored piles during the last decades. So they try to show the difference between the
design of such pile foundations based on the tradition in Austria, especially using often only a
SLS design, and the new approach according to EC 7-1 by means of examples of Danube
River bridges in eastern Austria already built several years ago, of one such bridge
construction which is now under execution and of one river bridge project abroad in southeastern
Europe, close to the Danube River.
The types of pile foundations to be presented in this paper are different as follows: single
piles combined to pile yokes, pile groups as usual and box-shaped pile groups for bridge
piers in the river-bed.
Concerning box-shaped pile foundations it will be shown that additional definitions which are
neither given in EC 7-1 nor in its NA for Austria are necessary for the design.
Finally some data on the behaviour of these pile foundations shall be presented.
Pile foundations; River bridges; EC 7-1; ÖNORM EN 1997-1
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.