CAEE – Distinguished Webinar Series in Earthquake Engineering and Seismology
Concrete Buildings in the Second-Generation European Standard for Design of Structures for Earthquake Resistance (EUROCODE8)
Wednesday, June 30, 2021, 1:00 p.m. EDT
Registration Link: https://yorku.zoom.us/webinar/register/WN_6uHUivjeTY2x8cxAUZKhBw
Abstract
The first-generation European Standard for the design of structures for earthquake resistance was developed between 1998 and 2006. It comprises six parts: Part 1 covers all general aspects, the seismic action and design of new buildings, Part 2 deals with design of new bridges, Part 3 addresses the seismic assessment and retrofitting of existing buildings, Part 5 covers foundations, retaining structures and geotechnical aspects and Parts 4 and 6 deal with certain types of special structures: tanks, silos, pipelines, towers, masts and chimneys. Conflicting national standards had to be withdrawn by early 2010, with the suite of Eurocodes established as the sole standards for structural and geotechnical design in the European Union. Under Mandate from the European Commission, development of the second generation started in 2014. In addition to technical updating and enhancement of ease-of-use and consistency between different Eurocodes, the second generation will see the eleventh member of the family added (one on structural glass), as well addition of parts addressing assessment and retrofitting of all types of structures under non-seismic loadings. Some Eurocode parts have been completed and are in the Final Vote stage; technical work on the rest (including the six Parts of Eurocode 8) is near completion. Withdrawal of the first-generation of Eurocodes as national standards and replacement by the full second-generation has to take place by March 2028. The second-generation Eurocode 8 has seen Part 1 split in two: Part 1-1-covers all provisions which apply to all types of structures: the performance requirements, the seismic action, seismic analysis and member stiffness, resistance and deformation capacity properties for use in all other Parts. It includes a state-of-the-art determination of the elastic spectrum accounting for all relevant topographic and geotechnical conditions and for soil nonlinearity and may give in an Informative Annex the first-in-history European Maps for spectral values. Part 1-2 covers exclusively new buildings and Part 2 only new bridges. Part 3 has been expanded to include seismic assessment and retrofitting of bridges, in addition to buildings, while Parts 4 and 6 have merged into one, covering design of new structures other than buildings or bridges. Part 5 has seen its scope expand very much, to cover, among others, underground structures and the use of inelastic deformations in the soil to reduce seismic demands in the superstructure. The displacement-based approach (with nonlinear analysis – pushover or of the response-history type- or, under certain well-defined conditions, linear 5%-damped analysis for estimation of displacements and deformations) is at an equal footing with the force-based one with reduction of the elastic spectrum.
The provisions for concrete buildings have been simplified and tuned better to the different needs of high, moderate or low seismicity regions across Europe. Prescriptive rules have been reduced and replaced to a very large extent by transparent performance-based provisions. Rational approaches, largely based on the Modified Compression Field Theory and fully consistent with the second-generation Eurocode 2, were introduced for the cyclic shear resistance of prismatic members and their connections. Provisions for modelling and verification of flat-slab frames as part of the lateral-load-resisting system have been added and resistance models for cyclic eccentric punching shear proposed, consistent with the new rules in Eurocode 2 for punching shear.
Michel Fardis, Ph.D., P.Eng.,
Emeritus Professor, University of Patras
Department of Civil, Engineering,
Email: fardis@upatras.gr
Professor Michael Fardis holds MSc Degrees in Civil Engineering and in Nuclear Engineering and a PhD in Structural Engineering from MIT, where he taught till 1983 to the rank of Associate Professor. Honorary President of the International Federation of Structural Concrete (fib), Honorary Member of the International Association of Earthquake Engineering and Corresponding Member of the Mexican Academy of Engineering. Editor of “Earthquake Engineering and Structural Dynamics”, Vice Chairman of CEN/TC250 “Structural Eurocodes” (2013-22) and Director of the International Association of Earthquake Engineering (2012-20). President of fib in 2009-10 and Deputy President in 2007-08. Chairman of CEN/TC250/SC8 “Design of structures for earthquake resistance” for the development of European Standard Eurocode 8 (1998-2005). Author of “Seismic design, assessment and retrofitting of concrete buildings” (Springer, 2009), lead author of “Seismic design of concrete buildings to Eurocode 8″ (CRC Press, 2015) and of “Designers’ guide to EN1998-1 and EN1998-5: Eurocode 8-Seismic actions, buildings, foundations, retaining structures” (ICE Publishing 2005); co-author of “Designers’ guide to EN1998-2: Eurocode 8-Bridges” (ICE Publishing 2012); author or co-author of over 30 Chapters in international books. Edited or co-edited four books published by Springer and over 10 other international books. He has about 95 papers in international journals, over 30 keynote or invited lectures at international conferences and over 170 papers in international conference proceedings. He received the 1993 Wason Medal of the American Concrete Institute for the best paper in materials.