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Smart Structures and Systems Volume 3, Number 1, January 2007 , pages 51-68 DOI: https://doi.org/10.12989/sss.2007.3.1.051 |
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Modeling shear capacity of RC slender beams without stirrups using genetic algorithms |
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M. Nehdi and T. Greenough
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| Abstract | ||
| High-strength concrete (HSC) is becoming increasingly attractive for various construction projects since it offers a multitude of benefits over normal-strength concrete (NSC). Unfortunately, current design provisions for shear capacity of RC slender beams are generally based on data developed for NSC members having a compressive strength of up to 50 MPa, with limited recommendations on the use of HSC. The failure of HSC beams is noticeably different than that of NSC beams since the transition zone between the cement paste and aggregates is much denser in HSC. Thus, unlike NSC beams in which micro-cracks propagate around aggregates, providing significant aggregate interlock, micro-cracks in HSC are trans-granular, resulting in relatively smoother fracture surfaces, thereby inhibiting aggregate interlock as a shear transfer mechanism and reducing the influence of compressive strength on the ultimate shear strength of HSC beams. In this study, a new approach based on genetic algorithms (GAs) was used to predict the shear capacity of both NSC and HSC slender beams without shear reinforcement. Shear capacity predictions of the GA model were compared to calculations of four other commonly used methods: the ACI method, CSA method, Eurocode-2, and Zsutty | ||
| Key Words | ||
| genetic algorithms; analysis; high-strength; concrete; beams; prediction; shear. | ||
| Address | ||
| Department of Civil and Environmental Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9 | ||