Title:
Influence of Inclined Web Reinforcement on Reinforced Concrete Deep Beams with Openings
Author(s):
Keun-Hyeok Yang, Heon-Soo Chung, and Ashraf F. Ashour
Publication:
Structural Journal
Volume:
104
Issue:
5
Appears on pages(s):
580-589
Keywords:
deep beams; mechanism; openings; reinforcement; shear strength
DOI:
10.14359/18860
Date:
9/1/2007
Abstract:
This paper reports the testing of 15 reinforced concrete deep beams with openings. All beams tested had the same overall geometrical dimensions. The main variables considered were the opening size and amount of inclined reinforcement. An effective inclined reinforcement factor combining the influence of the amount of inclined reinforcement and opening size on the structural behavior of the beams tested is proposed. It was observed that the diagonal crack width and shear strength of beams tested were significantly dependent on the effective inclined reinforcement factor that ranged from 0 to 0.318 for the test specimens. As this factor increased, the diagonal crack width and its development rate decreased, and the shear strength of beams tested improved. Beams having effective inclined reinforcement factors of more than 0.15 had higher shear strengths than that of the corresponding solid beam. A numerical procedure based on the upper bound analysis of the plasticity theory was proposed to estimate the shear strength and shear transfer capacity of reinforcement in deep beams with openings. Predictions obtained from the proposed formulas have a consistent agreement with test results.