الفهرس 
Numerical analysis on shear behavior of high strength concrete beams with openings
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Abstract
This thesis investigates the behavior of simply-supported high strength reinforced concrete beams with rectangular cross section having one rectangular opening at the mid height of the beam and subjected to two symmetrical-concentrated loads using a finite element model program (ANSYS 17). For this purpose, a set of forty-eight beams were analyzed and divided into five groups to study the behavior of beam with opening under different conditions. Main parameters were: Opening length (1₀), Opening height (1₀), and Position of the opening along the beam axis (S), The wide range for these parameters was taken as follows: 1₀ = (0.7 D, 1.02 D, and 1.4 D), h₀ = (0.228 D, 0.342 D, and 0.457 D), where D is the beam thickness; S = (5.3% L, 9.7% L, 14.2% L, 18.7% L, and 23% L) where L is the beam span ; {u0192}cu = (60) MPa ; (As’/As) = 0.156. All beams have cross section 120mm width, 350mm height, and the length between centers of two supports 2250mm.and all over span is equal 2500 mm. There are two alternatives of strengthening methods to compensate the beam strength, reduced by the existence of the opening. The two alternatives are: Adding extra stirrups, and adding diagonal bars, all around the opening zone. The conclusion indicate that the shear capacity increases by adding extra stirrups and adding diagonal bars all around the opening zone. Applied load, cracking load, crack pattern, deflection at mid-span, and failure load have been recorded