System

μ

Ductile steel frames:
ductile couples shear walls of reinforced concrete

6

Ductile reinforced concrete:
ductile reinforced concrete frames combined with shear walls with the frames carrying more than 30% of the shear force

5

Conventional steel frames:
systems of ductile reinforced concrete shear walls joined by beams

4

Frames-shear wall systems or ductile shear walls of reinforced concrete that do not fulfill the previous conditions:
chained masonry walls with distributed reinforcement

3.5

Chained masonry walls with strong bricks:
inverted pendulum-type structures with special join and support design details blocks
inverted pendulum-type structures that do not satisfy above requirements
hanging structures
reinforced concrete columns without links in the analyzed direction

3

Chained masonry walls with hollowed blocks:
inverted pendulum-type structures that do not satisfy above requirements
hanging structures
reinforced concrete columns without links in the analyzed direction

2

Structures for which an elastic behavior is required during destructive earthquakes

1