Abstract
This paper is related to a laboratory program for the shear strength of reinforced concrete corbels (RCC) cast with or without recycled aggregate (RA) by investigating the main parameters affecting the corbels behavior including the replacement aggregate recycling ratio, fcu, and shear span to effective depth ratio a/d. Eight specimens were cast and tested. The obtained results were compared with ACI and EC2 codes. It is found that the ACI code and E2 code give sensibly conservative results when compared with the findings of the present work for all tested specimens regarding RA, concrete strength, and a/d. Also, the experimental results show that the presence of recycled aggregate decreases slightly both cracking and failure loads. Furthermore, the failure load development due to the effect of compressive strength is more effective with the presence of recycled aggregate, and the 50% ratio of RA was the suitable ratio in elaborate crack and failure loads. Finally, the reduction of the span-depth ratio (from 0.50 to 0.35) increases the crack and failure load by 8.1% and 20.2%, respectively, leading to confirm that the corbel strength is much sensitive to decreasing span-depth ratio compared to the associated deflections.
Highlights
Corbels intended in RC structures to carry vertical and horizontal loads to main parts
The cracks appeared as few shear cracks within the region of supports; after that, a long shear crack was formed at either one or both supports and extended toward the point of the application of load. ese shear cracks propagate parallel to the line drawn from the midpoint of the load of application to the supports
For 100% recycled aggregate (RA) replacement ratio, 16.3 MPa increase in compressive strength of corbels C6 (a/d 0.5) enhanced the cracking and failure loads by 0.1% and 18.5%, respectively, compared with
Summary
Corbels intended in RC structures to carry vertical and horizontal loads to main parts. A/d is generally smaller than 1.0 and is subjected to concentrated loads as in support regions. Many studies were conducted to determine the parameters that affect the structural behavior of RCC subjected to vertical and horizontal forces using experimental and analytical programs; these variables were shape and dimensions, the amount of longitudinal and transverse steel reinforcements (As and Ast), and concrete strength [1, 2]. With the advanced development in the infrastructure area, the use of natural aggregate is getting more and more intense. To reduce this significant use, recycled aggregate was used as the substitute materials for the natural aggregate. Recycled aggregate consists of crushed, graded concrete particles treated from the concrete materials that have been used in the structures and destruction wreckage. e recycled aggregate is usually from constructions, roads, and bridges and occasionally even from disasters, like wars and earthquakes [3]
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