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New Methodology for Design and Construction of Concrete Members with Complex Stress Fields Using Steel Fiber–Reinforced Concrete
| 题名： | New Methodology for Design and Construction of Concrete Members with Complex Stress Fields Using Steel Fiber–Reinforced Concrete |
| 其他题名： | ACI(American Concrete Institute).(2014)."Building code requirements for structural concrete(ACI 318-14)and commentary on building code requirements for structural concrete(ACI 318R-14)."ACI Committee 318,Farmington Hills,MI. |
| 正文语种： | 英文 |
| 作者： | Xuejian Liu |
| 关键词： | Deep beam;Opening;Fiber-reinforced concrete;Structural concrete;Strut-and-tie model;Finite-element analysis;Concrete and masonry structures |
| 摘要： | Reinforced concrete members with significant geometric discontinuities or D-regions experience complex stress fields under loading, which require considerable analytical effort and usually complicated reinforcement detailing. Large openings in RC members can interrupt the direct load transfer provided by concrete struts, thereby leading to overstressed localized regions and unexpected failure modes. Empirically based strut-and-tie models (STMs) are generally used to design the reinforcement detailing of these RC members. However, many prior studies indicate that the resulting details can be very complicated while the actual stress fields deviate significantly from that assumed by STMs, thereby leading to unpredictable failure modes. This study investigates the feasibility of using steel fibers to replace the majority of conventional reinforcing bars in RC deep beams with significant D-regions. The test beams have two large openings, which are located between the loading point and the supports, thus disrupting the direct flow of forces. A simplified procedure is proposed for designing and detailing the reinforcement of steel fiber–reinforced concrete (SFRC) specimens based on the stress fields from elastic finite-element analyses. Experimental results show that when the critical regions of a test specimen were reinforced appropriately by conventional reinforcing bars and the remaining portion of that specimen was reinforced by SFRC with 1.0％ volume fraction of fibers, the reinforced SFRC specimen exhibited a ductile failure mechanism with very large plastic deformation. The reinforced SFRC specimens also showed much higher strength than the nominal design load and experienced slow postpeak strength loss. In comparison, although the RC specimen reached very high strength, it also showed an unexpected brittleness and localized failure behavior. This study also shows that finite-element simulation based on the modified compression field theory (MCFT) is able to identify possible failure mechanisms of reinforced SFRC specimens. |
| 出版年： | 2016 |
| 论文唯一标识： | P-26Y2016V142N11026 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/(ASCE)ST.1943-541X.0001588 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 142 |
| 期： | 11 |
| 页码： | 291-302 |
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