الفهرس 
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Abstract
from the work presented in this thesis the
strain in the main steel eq al to ·795 , 1115 and 1145 j’. strain for beams of concret~ cover of 7.5, 5 and 2.5 em,
crack pattern occurres depends on the concrete cover. 7- The average spacing between flexural cracks in reinforced concrete beams made of the available local
~l- The maximum crack width in reinforced concrete
beams increases as the distance of the point considered to the surface of nearest longitudinal bar increases.
~2- The crack widths in reinforced concrete beams
~ 3- The experimental test results gave no evidence
that variation of concrete strength have significant effect on crack width.
~4- At the same stress in the main reinforcing bars, the maximum crack width increases, with the decrease of the effective percentage of reinforcement.
5- The relationship between the maximum crack width and the strain in the concrete surface at the level of
up to 153 Of strain.
W max = ao D (£ s - 0.0002.) R
in which
ao = 159 [a~J r-5 + 2.83 h’
1
[~J
h2 = distance from the extreme tension fiber to the neutral axis
h3 = distance from the centroid of steel to th~ neutral axis