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| Content Provider | Springer Nature Link |
|---|---|
| Author | Hou, Li jun Luan, Zhi yong Chen, Da Xu, Shi lang |
| Copyright Year | 2015 |
| Abstract | This paper presents an experimental investigation into the shear behavior of reinforced ultra-high toughness cementitious composite (UHTCC) beams through flexural tests under a point loading, where UHTCC shows tension strain-hardening and multiple cracking characteristics. The varied parameters include shear-span ratios of about 2.06, 3.08, and 4.11, and web reinforcement ratios of 0%, 0.25%, 0.37%, and 0.55%. The experimental results reveal that reinforced UHTCC (RUHTCC) beams have superior shear resistance compared with reinforced concrete (RC) beams and show stable crack propagation and multiple cracking behaviors in shear. The use of UHTCC as the matrix of beams can serve as a replacement for minimum web reinforcement. A small amount of stirrups used in RUHTCC slender beams results in a more ductile flexure-shear or even flexural failure. However, the use of stirrups in both short beams and RUHTCC slender beams brings little improvement in ultimate shear strength, and thus no shear synergy between UHTCC and stirrups is obtained. A tied-arch model and a truss model can be used to represent the shear mechanism of RUHTCC short and slender beams, respectively. UHTCC web subjected to tension can be considered as inclined tension web members in a truss model for RUHTCC slender beams.揭示不同剪跨比和配箍率的钢筋增强超高韧性水泥基复合材料 (RUHTCC) 梁的抗剪性能, 为超高韧性水泥基复合材料 (UHTCC) 用于结构关键抗剪部位提供参考。基于抗剪试验结果, 阐明剪跨比和配箍率对 RUHTCC 梁抗剪性能的影响, 明确 UHTCC 与箍筋之间的复合抗剪效应, 揭示 RUHTCC 梁的抗剪机理。以剪跨比和配箍率为变量参数, 通过 RUHTCC 梁在跨中集中荷载作用下的弯曲试验, 研究 RUHTCC 梁的剪切裂缝形态、 荷载-挠度行为、 破坏模式、 开裂剪切强度和极限剪切强度等抗剪性能, 并结合试验结果, 分析 RUHTCC 梁的剪力传递机理。1. RUHTCC 梁呈现出优良的剪切抗力以及稳态的斜裂缝扩展过程和多缝剪切开裂行为。 2. 配置少量的箍筋可将典型的剪切破坏转变为较为延性的弯剪破坏甚至弯曲破坏。 然而, 箍筋的配置并未显著提高 RUHTCC 梁的抗剪能力, 同时耦合 UHTCC 与箍筋也没有表现出协同抗剪效应。 3. 拉杆-拱模型和桁架-拱模型可用以描述 RUHTCC 短梁和细长梁的抗剪机理。 |
| Starting Page | 251 |
| Ending Page | 264 |
| Page Count | 14 |
| File Format | |
| ISSN | 1673565X |
| Journal | Journal of Zhejiang University SCIENCE A |
| Volume Number | 16 |
| Issue Number | 4 |
| e-ISSN | 18621775 |
| Language | Chinese |
| Publisher | Zhejiang University Press |
| Publisher Date | 2015-10-01 |
| Publisher Place | Hangzhou |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Ultra-high toughness cementitious composite (UHTCC) Shear-span ratio Stirrups Shear strength Diagonal crack Shear mechanism Mechanical Engineering Civil Engineering Classical and Continuum Physics Industrial Chemistry/Chemical Engineering |
| Content Type | Text |
| Resource Type | Article |
| Subject | Engineering |
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