algerian earthquake resistant regulations « rpa 99 - IISEE

a 3 . The shape of the building should be compact with a length to width ratio of the floor
less than or equal to four (4) (cf.fig.3.2). The sum of the dimensions of the re-entrant
parts and setbacks in a given direction should not exceed 25% of the global dimension
of the building in that direction (cf.fig.3.3).
a 4 . The floors should have sufficient in plane rigidity in regard to that of the vertical
bracing elements to be considered as rigid in their plane. In this case, the total area of
the floor openings should be less than 15% of that of the floor.
b) Regularity in elevation
b 1 . The bracing system should not present vertical discontinuous bearing element the
load of which is not transmitted directly to the foundation.
L + L
L
1 2
≤
0.25
L + L
L
1 2
≤
0.25
1-20