Abstract
Fundamental changes of the existing standard EN 1998-1, with incorporation of latest research results, are proposed in the second generation of Eurocode EN 1998-1-1. A spectrum of earthquake loads, defined by several points established in a probabilistic manner, is presented and commented on. In addition, the new EN 1998-1-1: a) introduces 12 return periods for earthquakes (instead of the previous two periods), b) cancels previous elastic spectra Type 1 and Type 2, c) introduces a new moment magnitude Mw instead of the surface magnitude Ms, d) introduces four limit states instead of the previous two NCR and DLR, etc.
Highlights
The need for regulating construction methodology in seismically active areas in Slovenia, Croatia, Serbia, Bosnia & Herzegovina, Montenegro, and Northern Macedonia, has been recognised for a long time
A new moment magnitude Mw is introduced instead of the surface magnitude Ms The moment magnitude Mw is defined in the literature. -- The following four limit states are introduced instead of the current two limit states (NCR and damage limitation requirement (DLR)): near-collapse (NC), significant damage (SD), damage limitation (DL) and fully operational (OP). -- The behaviour factor concept q is used in all modern regulations worldwide and so the concept of q factor has been kept in the second generation EN19981-1, but behaviour factors are defined in a different way
This means that, for any reinforced concrete structure, it is currently not known whether such structure will have more or less reinforcement according to new spectra
Summary
The need for regulating construction methodology in seismically active areas in Slovenia, Croatia, Serbia, Bosnia & Herzegovina, Montenegro, and Northern Macedonia, has been recognised for a long time now. Some provisions of the second-generation standard EN 19981-1, and some provision from EN 1998-1-2 for buildings, will be presented and commented on in this paper It will be significant for anyone involved in earthquake engineering the day when the new European structural standards will entry into force and bring crucial changes when compared to the current EN1998-1: 2004 standard. -- In the second-generation EN 1998-1-1, the load spectrum is fixed with several points that are determined probabilistically (other spectrum points are defined deterministically), and these points are: spectral values “on plateau”, for T = 1s and for T = TA This spectrum has been modernized with respect to the spectrum given in the current EN 1998-1: 2004, as several points in this new spectrum are defined based on the probabilistic approach, while in the existing spectrum EN 1998-1: 2004 only one point (for T = 0) is defined probabilistically. Proposal of response spectra in the second generation of Eurocode EN 1998-1-1 for seismic areas and comparison with the existing standard EN 1998-1: 2004 Građevinar 10/2020
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