Deformation-based seismic design and verification of earth- and retaining structures in Switzerland
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Date
2018
Publication Type
Conference Paper
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yes
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Abstract
The value of the horizontal ground acceleration for the seismic design of earth- and retaining structures according to the Swiss buildings codes varies between 0.6 and 3.2 m/s2 . This range takes into account the different seismic zones, soil classes and importance factors of constructions, but does not include the reduction factors used for design. On the one hand, the seismic load case can be determinant even at relatively low values of horizontal ground acceleration for a force-based design. On the other hand, observed performances of earth and retaining structures in earthquakes worldwide and in shake table tests show that such structures are usually not significantly damaged by horizontal ground accelerations in this range, especially for magnitudes that are characteristic for regions with low to moderate seismicity, like Switzerland. Therefore, it can be questioned if the force-based seismic provisions of the buildings codes for earth- and retaining structures are too conservative.
This question has been studied in a joint project of the Swiss federal roads office (FEDRO), the Swiss federal railways (SBB) and the Swiss federal office for the environment (FOEN). In this project, modifications to reduce the conservatism of the force based design for earth- and retaining structures were made and a deformation based design approach was developed as an alternative to the force based method. Results of this work were included in the revision of the Swiss building code SIA 267 (Geotechnical design) in 2013, in the new building code SIA 269/8 “Existing structures - earthquakes” (2017) and in a technical documentation of the Swiss federal roads office “Seismic safety of earth- and retaining structures” (FEDRO, 2018). This paper describes the application of the newly developed deformation-based approach.
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published
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Book title
Proceedings of the 16th European Conference on Earthquake Engineering (16ECEE)
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Volume
Pages / Article No.
10907
Publisher
European Association for Earthquake Engineering
Event
16th European Conference on Earthquake Engineering (16ECEE)
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Date created
Subject
Seismic safety; Retaining structures; Deformation-based approach
Organisational unit
09569 - Anastasopoulos, Ioannis / Anastasopoulos, Ioannis
02607 - Institut für Geotechnik / Institute for Geotechnical Engineering
Notes
Poster presentation on June 18, 2018.