الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The wide spread of the use of masonry structures resulted
in the creation of different construction techniques in
building masonry walls The behaviour of concrete block
masonry walls subjected to concentrated load is a commonly
encountered problem in practice for design of masonry
structures such as cross beams lintel supports, etc .
The behaviour of solid masonry walls under a concentrated
load was studied before , but the performance of hollow ,
grouted and reinforced concrete masonry walls under the same
type of loading is still a matter of research .
In this study , an experimental program was performed to
investigate the effect of the different constituent materials
of concrete block masonry walls ( hollow , grouted and
reinforced ) on the mechanical and deformational behaviours
of these walls under a concentrated load . A total of twenty
four wall panels were used to study the effect of mortar
strength , grout strength and the steel reinforcement of the
bond beam on the crack pattern and made of failure , cracking
load , load - deflection relationship, and horizontal and
vertical strain distribution .
It was found that the increase in mortar strength of
hollow masonry walls resulted in an increase in the cracking
and ultimate loads and in the stiffness of the walls , and a
reduction in the vertical and horizontal strains The same
effect was noticed in grouted masonry walls , but only a
slight change was recorded at high values of mortar strength
The enhancement in the mechanical properties of grouted
walls due to the presence of grout columns was significant .
However , the grout strength had no effect on the different
mechanical properties of the grouted walls . Reinforced walls
by both bond beam and vertical and horizontal reinforcement
showed higher capacity in resisting a concentrated load than
unreinforced ones Lastly the increase in the main
reinforcement of the bond beam lead to an increase in the
mechanical behaviour of these reinforced walls .
In addition , a brief cost estimate of wall bearing
structures of concrete block masonry was introduced to make a
comparison between its cost and the cost of the skel ton
structure types . it was found that the cost of the bearing
wall type is equal about 90 % of cost for skelton structure
type .