Influence of Shear Span-to-Effective Depth Ratio on Behavior of High-Strength Reinforced Concrete Beams

International Journal of Concrete Structures and Materials

Abdullah Almakrab¹  Ahmed Ibrahim¹  Richard Nielsen¹  Nicholas Saras²  Olaniyi Arowojolu³ 

[1] Department of Civil and Environmental Engineering, University of Idaho, 83844, Moscow, USA;Department of Civil and Environmental Engineering, University of Idaho, 83844, Moscow, USA;Horrocks Engineers, Boise, ID, USA;Department of Civil and Environmental Engineering, University of Idaho, 83844, Moscow, USA;Texas Department of Transportation, Austin, TX, USA;

关键词: high-strength concrete;    shear span-to-effective depth ratio;    aggregate interlock;    shear strength;    moment capacity;   

DOI  :  10.1186/s40069-020-00444-7

来源: Springer

【 摘 要 】

The shear span-to-effective depth ratio (a/d) is one of the factors governing the shear behavior of reinforced concrete (RC) beams, with or without shear reinforcement. In high-strength concrete (HSC), cracks may propagate between the aggregate particles and result in a brittle failure which is against the philosophy of most design guidelines. The experimental results of six HSC beams, with and without shear reinforcement, tested under four-point bending with a/d ranged from 2.0 to 3.0 are presented and compared with different model equations in design codes. The a/d ratio has higher influence on the shear strength of reinforced HSC beams without shear reinforcement than beams with shear reinforcement. Most of the shear resistance prediction models underestimate the concrete shear strength of the beams but overpredict shear resistance of beams with shear reinforcement. However, the fib Model code 2010 accurately predicted the shear resistance for all the beams within an appropriate level of approximation (LoA).

【 授权许可】

CC BY