Behaviour of Reinforced Self-Compacted Layered-Concrete Deep Beams under Monotonic Loading

Document Type : Regular Paper

Authors

Department of Civil Engineering, Faculty of Engineering, University of Kufa, Najaf, Iraq

Abstract

The use of reinforced concrete (RC) deep beams has expanded dramatically over the past few decades. Then, improving the performance while maintaining the cost as low as possible cost has become a critical concern. In the current work, a layered model based on using high performance concrete (HPC) at the top half of the section only has been considered. Six specimens were tested experimentally under static load up to failure. It is aimed to determine the range of improvement in the general performance due to use of steel fiber concrete (SFC) or reactive power concrete (RPC) at the top half of the deep beams. Moreover, the effect of loading configuration (one-point or two points) which considered implicitly the effect of the shear span-to- depth ratio (a/h) was considered. The response was studied in terms of several indicators including the load-deflection curve, the failure load the crack width, the mode of failure, map of cracking, toughness, and ductility. Results showed that for one-point load, the failure loads for the hybrid specimens with SFC and RPC at top layers of the section was enhanced by 22% and 28% relative to the non-hybrid model. While enhancements of 27% and 34% were recorded under two point loads. Moreover, it was found that reducing a/d ration from 1.67 to 1.22 resulted in enhancements of 32%, 37% and 39% for the non-hybrid and hybrid sections respectively. Regarding toughness, enhancements of 28% and 144%, were obtained for the specimens hybrid with SFC under one-point and two-point loading systems respectively. When RPC was used, the corresponding improvements were 44% and 188%, respectively.

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History

  • Receive Date: 04 April 2024
  • Revise Date: 16 January 2025
  • Accept Date: 17 January 2025

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