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Shear Design of Strain-Hardening Fiber-Reinforced Concrete Beams
| 题名： | Shear Design of Strain-Hardening Fiber-Reinforced Concrete Beams |
| 正文语种： | eng |
| 作者： | Rafic G. El-Helou;Benjamin A. Graybeal |
| 作者单位： | Genex Systems/Turner-Fairbank Highway Research Center;FHWA Turner-Fairbank Highway Research Center |
| 关键词： | Beam;Fiber-reinforced concrete (FRC);Modified compression-field theory (MCFT);Prestressed girders;Shear capacity;Shear design model;Strain compatibility;Strain-hardening (SH) concrete;Ultrahigh-performance concrete (UHPC) |
| 摘要： | Abstract Strain-hardening fiber-reinforced concrete (SH-FRC), such as ultrahigh-performance concrete (UHPC), offers sustained tensile capacities up to high values of postcracking strains and, consequently, delivers shear resistance through different mechanisms than conventional concrete. Existing shear design methods for conventional concrete beams include empirical approximations of the tensile resistance offered by the cracked concrete that do not apply to SH-FRC materials. This article presents a design formulation that predicts the shear capacity of SH-FRC beams in support of ongoing efforts to develop UHPC structural design guidance in the United States. The proposed model leverages foundational concepts from engineering mechanics, similar to the modified compression-field theory (MCFT) for conventional reinforced and prestressed concrete, while integrating relationships that address behaviors specific to SH-FRC. The model predicts shear stress versus shear strain behavior of a cracked SH-FRC membrane element, which is then used to model the web of a beam. Verified against experimental shear test results of I-shaped prestressed and non-prestressed beams with different material properties, beam geometries, axial strains, and transverse reinforcement ratios, the proposed shear design model is demonstrated to conservatively predict the shear capacity of SH-FRC beams. As such, this work constitutes a fundamental step in developing mechanics-based SH-FRC shear design guidance. |
| 出版年： | 2023 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 149 |
| 期： | 2 |
| 页码： | 04022234.1-04022234.18 |
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