Title:
Shear Behavior of Ultra-High-Performance Concrete Beams Reinforced with High-Strength Steel Bars
Author(s):
S. Ahmad, S. Bahij, M. A. Al-Osta, S. K. Adekunle, and S. U. Al-Dulaijan
Publication:
Structural Journal
Volume:
116
Issue:
4
Appears on pages(s):
3-14
Keywords:
concrete beam; cracking pattern; high-strength steel; mechanistic model; shear capacity; ultra-high-performance concrete (UHPC); ultra-high-performance fiber-reinforced concrete (UHPFRC)
DOI:
10.14359/51714484
Date:
7/1/2019
Abstract:
This study was conducted to investigate the effects of key structural parameters on the shear behavior of non-prestressed
ultra-high-performance concrete (UHPC) beams passively reinforced with high-strength steel bars. The parameters studied were shear span to effective depth ratio a/d; volume fraction of steel fibers Vf ; longitudinal reinforcement ratio ρ; and stirrups spacing s. Ten beam specimens with cross-section dimension (width x depth) 5.91 x 8.86 in. (150 x 225 mm) were quasistatically loaded to failure on a simple span length of 68.9 in. (1.75 m), under a four-point loading configuration. The statistical analysis of the experimental data indicated that a/d, Vf, and s have significant effects on the shear capacity of UHPC beams, while the effects of ρ are quite insignificant. A mechanistic model for estimating the shear capacity of reinforced UHPC beams was developed, validated, and shown to be reasonably accurate.
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