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Пише това:
Reinforced concrete frame and masonry are the two highest-risk building types used for pre-2000 multifamily housing in Sofia.
BUILDING CLASSIFICATION & VULNERABILITY RANGE
Unreinforced Masonry: built with masonry walls that lack steel reinforcement; includes confined and unconfined walls.
Reinforced Concrete Frame: reinforced concrete frames that provide earthquake resistance; includes precast and cast-in-place frames.
Dual Frame-wall: reinforced concrete frame and wall elements work together to resist earthquake forces.
Precast Large Panel: built with precast reinforced concrete panels with floor-to-ceiling height facade panels.
Block: built with precast concrete elements assembled on site; similar to LPB with smaller facade elements.
Slab-column System: reinforced concrete floor slabs directly connected to concrete columns; includes lift slabs and post-stressed slabs.
Reinforced Concrete Wall: cast-in-place walls that provide earthquake resistance; includes standard, sliding, and tunnel formwork.
Note that the relative vulnerabilities are approximate and depend on postconstruction modifications, degradation, construction quality, and year of construction. See Types of Multifamily Buildings in ECA for more information.
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