Behavior of Deep Beams using Different Concrete Grades
Abstract
This paper presents the experimental results of
the investigation of behavior of simply supported deep beams having layers of
concrete of different grades (25 MPa and 50 MPa). The tested beams were loaded
with one vertical load at mid span up to failure. All specimens were fabricated
and tested at the laboratory of reinforced concrete of Faculty of Engineering,
Ain Shams University. The experimental program is carried out using five simply
supported deep beams having the same dimensions; specimens with an effective
span of 1100 mm, width of 200 mm and a height of 1000 mm, specimens also have
the same top, bottom, vertical, and horizontal reinforcement. The experimental
studies showed that the failure of tested deep beams was mainly due to diagonal
cracks. Casting concrete on different layers causes the first cracks appeared
at earlier load than in beam with one grade of concrete. It was also found that
the best flexural behavior of deep beams is obtained when the bottom layer is
casted using high concrete compressive strength and gives results (deflection,
and failure load) close to results of deep beam casted with high compressive
strength.
Country : Egypt
1 Noha Ahmed Metwally Ahmed2 Prof. Ayman Hussein Hosny Khalil3 Dr. Ezz El-deen Mostafa
Structural Engineering Department, Faculty of Engineering, Ain Shams University, Egypt
Structural Engineering Department, Faculty of Engineering, Ain Shams University, Egypt
Structural Engineering Department, Faculty of Engineering, Ain Shams University, Egypt
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