الفهرس 
Chapter I : IntroductionOnly 14 pages are availabe for public view
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Abstract
During 1960’s and 70’s the extensive research carried out on solid plain and
reinforced concrete members under pure torsion as well as torsion combined
with bending, shear and normal force led to design provisions for these
actions in various national codes. Only very limited literature is available
regarding the behavior of reinforced concrete beams with web opening
subjected to pure torsion. In addition, no national code gives any guidelines
for the design of concrete beams with rectangular web opening under
torsion. Hence, this investigation aims at studying and investigating
experimentally and theoretically, the behavior of concrete beams with
rectangular web opening subjected to pure torsion. In addition, some of
tested beams were strengthened around opening to increase the capacity of
torsional moment and eliminate the opening effect. The study investigates
the effect of opening dimension and location on the behavior of reinforced
concrete beams. In addition, the study investigates the effect of different
shape and amount of reinforcement around opening on the behavior of
reinforced concrete beams. The testing program, experimental results, and
evaluation of the effects of the test variables on the behavior of R.C. beams
with web opening subjected to pure torsion were presented here in after.
The softened truss model was modified to be applicable for R.C. beams with
web opening subjected to pure torsion, and the theoretical results were in
good agreement with experimental results. Finally, a design procedure for
R.C. beams with web opening subjected to pure torsion was proposed.