Page 482 - Advanced Design Examples of Seismic Retrofit of Structures

Examples of Nonengineered Buildings Chapter 6 425

TABLE 6.6 Typology of Rural Houses of Iran—cont’d

Type 6: Brick/cement block
walls with wooden flat roof
Location: Like other types with
wooden flat roof, usually found
in regions that wood is
available.
Description: Unreinforced
masonry building with large
openings and weak roof to wall
connection.
The walls are made of brick or
cement blocks about 22cm
thick and weigh about
2
380kg/m .
Type 7: Brick/cement block
walls with arched roof
Location: Arid and semiarid
regions.
Description: The roof is built
with brick and covered with
mud-straw. Wall to wall
connection is limited to laying
bricks alternatively in two
perpendicular directions.

Type 8: Brick/cement block
walls with jack-arch roof
(without tie-beams)
Location: In almost all rural
regions. This type is built with
industrial materials and as a
result is not restricted to one
specific climate.
Description: Unreinforced
masonry buildings, weak even
against moderate earthquakes.
Among problems: large
openings, too much spacing
between bearing beams, lack
of technical know-how
(e.g., using mud mortar instead
of sand-cement mortar), and
low ductility.
Continued