الفهرس 
CHAPTER -1, INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Shear forces are among the most dangerous and important forces that
must be taken into account when designing concrete beams. Experimental
program and numerical analysis have been conducted in order to study the
effect of using some shear systems in improving the shear resistance. These
systems have been classified into reinforcing steel system (stirrups and bentup
bars) and strengthening plates system (steel plates, CFRP plates and
UHPFRC plates). Fruitful results were obtained from the study. Although
the spiral stirrups system gives better shear resistance than the vertical
stirrups system, the performance difference is not sufficiently satisfactory.
The inclined stirrups and bent-up bars systems give a significantly higher
performance more than the vertical stirrups system (the increase in the shear
resistance is about one-fifth). Condensing the stirrups at the shear zone
increases the shear resistance by about one-third. Strengthening the
maximum shear stresses zone in the beam with 10cm width plate (steel
plate, CFRP plate and UHPFRC plate) increases the shear resistance by
about 37%, 30%, and 26%, respectively. Strengthening the shear stresses
zone in the beam with 39cm width plate (steel plate, CFRP plate and
UHPFRC plate) increases the shear resistance by about 77%, 61%, and 77%,
respectively. Strengthening the entire span of the beam with (steel plate,
CFRP plate and UHPFRC plate) increases the shear resistance by about
95%, 61% and 100%, respectively.