| 直缝型后张预应力装配式UHPC挡块抗震性能研究 |
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| 引用本文： | 吴文朋,叶鑫,周权,李立峰.直缝型后张预应力装配式UHPC挡块抗震性能研究[J].中国公路学报,2023,36(2):129-140. |
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| 作者姓名： | 吴文朋 叶鑫 周权 李立峰 |
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| 作者单位： | 1. 湘潭大学 土木工程学院, 湖南 湘潭 411105;2. 湖南大学 土木工程学院, 湖南 长沙 410082 |
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| 基金项目： | 国家自然科学基金项目（51908481）；湖南省自然科学基金项目（2020JJ5543）；湖南省教育厅科学研究项目（21B0148）；中国博士后科学基金项目（2018M640756）* |
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| 摘 要： | 针对常规普通混凝土挡块在震后修复较困难的问题，提出一种适用于中小跨径桥梁结构的可替换直缝型后张预应力装配式超高性能混凝土（UHPC）挡块结构形式。设计并制作了4组装配式UHPC挡块模型试件，分别进行拟静力破坏试验，探讨了加载高度、挡块厚度和预应力初张力大小对后张预应力装配式UHPC挡块抗震性能的影响。然后，建立ABAQUS有限元分析模型并与试验结果进行校核验证，通过一系列有限元参数分析研究了挡块摩擦因数、荷载加载高度、预应力初张力值和UHPC挡块厚度对新型挡块转动机制的影响机理。研究结果表明：装配式UHPC挡块具有良好的抗震位移能力和自复位功能；挡块与盖梁间的摩擦因数对挡块转动性能的影响可忽略不计；加载高度增加会导致挡块转动临界荷载和承载能力下降；增加挡块厚度能显著提升挡块自身强度，降低挡块地震损伤；增大预应力初张力大小能够提高挡块的临界转动荷载和承载能力；进行后张预应力装配式UHPC挡块设计时，可直接利用预应力初张力和加载高度等参数来估算挡块的设计临界转动荷载。
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| 关 键 词： | 桥梁工程 抗震性能 试验研究 UHPC挡块 有限元 后张预应力 |
| 收稿时间： | 2021-08-31 |
Seismic Performance Investigation of Post-tensioned Prefabricated UHPC Retaining Block with Straight Joint |
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| WU Wen-peng,YE Xin,ZHOU Quan,LI Li-feng.Seismic Performance Investigation of Post-tensioned Prefabricated UHPC Retaining Block with Straight Joint[J].China Journal of Highway and Transport,2023,36(2):129-140. |
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| Authors: | WU Wen-peng YE Xin ZHOU Quan LI Li-feng |
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| Affiliation: | 1. College of Civil Engineering, Xiangtan University, Xiangtan 411105, Hunan, China;2. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China |
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| Abstract: | In view of the difficulty in repairing a traditional normal concrete retaining block after it was damaged in an earthquake event, this study proposed a post-tensioned prefabricated ultra-high-performance concrete (UHPC) retaining block structure with straight joint that was replaceable and suitable for medium-to-small-span bridges. Four prefabricated UHPC retaining block specimens were designed and produced. Pseudo static failure tests were performed for all specimens. The effects of the loading height, block thickness and initial prestressing tension on the seismic performance of the post-tensioned prefabricated UHPC retaining block were analyzed. Subsequently, the ABAQUS finite element analysis model was established and verified by comparing with the test results. A series of finite element parameter analyses were carried out to study the influence of the friction coefficient, loading height, initial prestressed tension, and block thickness on the rotation mechanism of the new UHPC retaining blocks. The results showed that the post-tensioned prefabricated UHPC retaining block had an excellent displacement capacity and self-resetting function. The friction coefficient between the retaining block and bent cap had nearly no effect on the rotational performance of the retaining block. Increasing the loading height decreased the critical rotational load and bearing capacity. Increasing the block thickness significantly improved the strength of the block earthquake damage. Increasing the initial prestressing tension increased the critical rotational load and strength capacity of the block. In the design process of the post-tensioned prefabricated UHPC retaining block, the corresponding critical rotational load can be directly estimated using the parameters of the initial prestressed tension and loading height. |
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| Keywords: | bridge engineering seismic performance test study UHPC retaining block finite element post-tensioned |
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