چكيده لاتين :
Confined masonry buildings are used in rural and urban area sofIran. They performed almost satisfactory
during past mod erate earthquakes oflran. There is not a methodology in Iranian Seismic Code (Standard 2800- 3rd
edition) to est imate their capacities quantitatively: In line with remo ving this constraint, an attempt is made to study
in-plane behavior of two squared confined masonry walls with and without ope ning bv using a numeri calapp roach.
These walls are considered based on Iranian Seismic Code requirements. Finit e element 2D models of the walls are
de veloped and a pushover analysis is carried out . To model the non- linear behavior ofthe confined masonry walls , the
following criteria are used: (1) The Rankine-Hill yield criterion with low orthotropic factor to model the masonry
panel: (2) The Rankine yield criterion to model reinforced concrete bond-beams and tie-columns: (3) The Coulomb
Fiction criterion with tension cutoff mode To model the interfa ce zone between the masonry panel and reinforc ed
conc rete members. For this purpose. the unknown parameters are de termined bv testing of masonry and concrete
samples: and by finite element analysis. Comparing the results show that the ini tial stiffness. the maximum lateral
strength and the ductilitvfactor of walls with and without opening are different . Also, the severe compressed zones of
the masonry panels within the confining elements are found different fro m what are reported for the masonry panels
of infilled Fames by other researchers. This study shows that a further investigation is neededfor estimating capacity
of confi ned masonry walls with and without open ing analytically and expe rimentally. Also where openings, with
medium size are ex isted. the confi ning elements should be added around them. These issues can be considered in the
next revisions of Iranian Seismic Code
