DD ENV 1998-3:1997

Contents
National Foreword
Foreword
1. General
1.1 Scope
1.2 Definitions
1.3 Special terms used in Part 3 of Eurocode 8
1.4 Definitions
1.5 S.I. Units
1.6 Symbols
2. Basic requirement and compliance criteria
2.1 Scope
2.2 Compliance criteria
2.3 Importance factors
2.4 Non collapse requirement (ultimate limit state)
2.5 Minimisation of damage (serviceability limit state)
2.6 Behaviour factor
3. Seismic action
3.1 Definition of the seismic input
3.2 Elastic response spectrum
3.3 Design spectrum
3.4 Time-history representation
3.5 Long period components of the motion at a point
3.6 Spatial variability of the seismic motion
4. Modelling of structures
4.1 Number of degrees of freedom
4.2 Masses
4.3 Stiffnesses
4.4 Damping
4.5 Soil-structure interaction
5. Methods of analysis
5.1 Applicable methods
5.2 Simplified dynamic analysis
5.3 Multimodal analysis
5.4 Combination of different ground motion components
5.5 Combination of internal actions
5.6 Combination of the seismic action with other actions
5.7 Displacements
6. Safety verification
6.1 Ultimate limit state
6.2 Serviceability limit state
Annexes
Annex A (Informative) Linear dynamic analysis accounting
                       for a rotational seismic motion
Annex B (Informative) Analysis procedure for damping
Annex C (Informative) Soil-structure interaction
Annex D (Informative) Number of desgres of freedom and
                       number of modes of vibration
Annex E (Informative) Special rules of reinforced
                       concrete chimneys
Annex F (Informative) Materials for steel structures
Annex G (Informative) Electric transmission towers