الفهرس 
صفحة العنوانOnly 14 pages are availabe for public view
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Abstract
Transverse openings in reinforced concrete beams are often needed to provide
passage for utility ducts that accommodate essential services such as water supply,
electricity, telephone, air-conditioning, and computer network. The presence of
openings reduces the beam stiffness and produces excessive stresses as compared
with beams without openings. In this research, an experimental investigation on beams
containing openings, located in the shear zone. The effect of opening must be
considered in designing process of beams with openings in order to retrieve the lost
strength and stiffness of such beams. Several design parameters are considered: the
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opening width, the opening height, the stirrups top and bottom chord, the inclined bars,
compressive strength. Experimental and numerical investigations are performed on
specified specimens with many varying parameters. The experimental program consists
of six reinforced concrete beams with dimension of (200 mm) in width, (400 mm) in
depth and (2400 mm) in length. The clear span between supports is equal to (2100
mm). Specimens were divided into control solid tested RC beam, control tested RC
beam with small opening, and four tested RC beams with large opening. The testing
results include: the crack patterns, mode of failures, load-deflection curves, load-strain
curves and the value of the maximum load. The experimental results showed that there
was a significant improvement in the shear zone by using reinforcement around opening
for beams with large and small openings. The experimental results showed that the
effect of adding reinforcement bars around the opening substantially improve the beam
shear strength.
In addition, the tested beams specimens are analyzed using the nonlinear finite
element program, ANSYS. from the program outputs, the cracking load, the maximum
load, cracking pattern, load-deflection graphs, a comparison between test results
ANSYS outputs was also presented. The ANSYS program showed good agreement
with the experimental tested beams.