EN 1998-5 Seismic Effects
If the coefficients kh and kv are not obtained from measurements it is necessary, providing the analysis is carried out according to 1998-5 Eurocode 8: Design of structures for earthquake resistance - Part 5: Foundations, retaining structures and geotechnical aspects, to input these coefficients as follows:
where: | α | - | ratio of the design ground acceleration on type A ground (ag / g) |
S | - | soil factor defined in EN 1998-1:2004, chapter 3.2.2.2 | |
R | - | factor for the calculation of the horizontal seismic coefficient - see tab. |
for: | | |
for other cases: | |
Type of sheeting structure | R |
Free gravity walls that can accept a displacement up to dr = 300αS (mm) | 2 |
Free gravity walls that can accept a displacement up to dr = 200αS (mm) | 1.5 |
Flexural reinforced concrete walls, anchored or braced walls, reinforced concrete walls founded on vertical piles, restrained basement walls and bridge abutments | 1 |
More detailed description can be found in EN 1998-5 chapter 7.3.2.2 Seismic effects