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材料导报  2023, Vol. 37 Issue (18): 22010146-9    https://doi.org/10.11896/cldb.22010146
  无机非金属及其复合材料 |
超高性能混凝土预应力锚固齿块承压性能研究
杨俊1,2, 任伟2, 冷景晨2, 张中亚1,2,*, 邹杨1,2, 周建庭1,2, 胡天祥3
1 重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆 400074
2 重庆交通大学土木工程学院,重庆 400074
3 深圳高速公路集团股份有限公司,广东 深圳 518026
Research on Local Pressure Performance of Ultra-high Performance Concrete Prestressed Anchor Block
YANG Jun1,2, REN Wei2, LENG Jingchen2, ZHANG Zhongya1,2,*, ZOU Yang1,2, ZHOU Jianting1,2, HU Tianxiang3
1 State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
3 Shenzhen Expressway Group Co., Ltd., Shenzhen 518026, Guangdong, China
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摘要 为提高齿块的承压性能与耐久性能,以连续刚构桥预应力锚固齿块为研究对象,开展超高性能混凝土(UHPC)锚固齿块的承压性能试验,研究了局压与全压荷载作用下锚固齿块的抗裂性能、极限承载力、破坏特征和五种典型局部效应,并提出了UHPC预应力锚固齿块局压承载力计算公式。结果表明:UHPC能有效提高锚固齿块的抗裂性能和承压能力。相较于普通混凝土(NC)预应力锚固齿块,局压荷载作用下UHPC预应力锚固齿块的抗裂性能和极限承载能力分别提高了2.51倍和3.27倍,提升效果显著,在进行UHPC预应力锚固齿块设计时,在保证其力学性能并兼顾经济性的条件下,建议其尺寸设计为NC预应力锚固齿块的0.75倍。局部承压下,UHPC预应力锚固齿块的破坏模式与NC预应力锚固齿块存在明显区别,UHPC预应力锚固齿块的整体性更好,仅在底板和齿块出现微小裂缝,荷载-位移曲线具有明显屈服平台;同时,所有锚固齿块均呈现显著的“锚下劈裂效应”和“锚后牵拉效应”;最后,基于试验结果和有限元分析,对UHPC预应力锚固齿块局部区承载能力计算公式进行了修正,计算结果精度为95%,可为UHPC预应力锚固齿块的工程实际运用提供理论参考。
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杨俊
任伟
冷景晨
张中亚
邹杨
周建庭
胡天祥
关键词:  UHPC  预应力锚固齿块  局压承载能力  局部效应    
Abstract: In order to improve the pressure-bearing performance and durability of the prestressed anchor block, the prestressed anchor blocks of continuous rigid frame bridge were taken as research object and the compression performance test of the ultra-high performance concrete (UHPC) anchor blocks were carried out. The crack resistance, ultimate bearing capacity, failure characteristics and five typical local effects of the anchored tooth block under partial pressure and full pressure load were researched and the calculation formula of bearing capacity was proposed. The results show that UHPC can effectively improve the crack resistance and pressure-bearing capacity of the anchor tooth block. Compared with NC prestressed anchored tooth blocks, the crack resistance and ultimate bearing capacity of UHPC prestressed anchor blocks under local compressive load are increased by 2.51 times and 3.27 times, respectively. The improvement effect is remarkable. When designing the UHPC prestressed anchor tooth block, it is recommended that its size be designed to be 0.75 times the NC prestressed anchor tooth block under the condition of ensuring its mechanical properties and taking into account the economy. The local pressure-bearing failure mode of UHPC prestressed anchor block is obviously different from that of NC prestressed anchor block. Its integrity is better and only small cracks appear in the bottom plate and anchor block. The load-displacement curve has an obvious yield platform. At the same time, all prestressed anchor blocks show significant ‘under-anchor splitting effect’ and ‘post-anchor pulling effect’. Finally, based on the test results and finite element analysis, the calculation formula for the local bearing capacity of UHPC prestressed anchor blocks is revised. The accuracy of the calculation result is 95%, which can provide a theoretical reference for the practical application of engineering in the future.
Key words:  UHPC    prestressed anchor block    local pressure-bearing capacity    local effects
出版日期:  2023-09-25      发布日期:  2023-09-18
ZTFLH:  U448.213  
基金资助: 国家自然科学基金(U20A20314;51908093);中国博士后科学基金(2021M693919);重庆市自然科学基金(cstc2020jcyj-msxmX0088);重庆交通大学研究生科研创新项目资助(2021S0017)
通讯作者:  *张中亚,工学博士(后),副教授,硕士研究生导师,重庆交通大学土木工程学院教师,山区桥梁及隧道工程国家重点实验室研究人员,2019年于重庆大学获得博士学位。主要从事UHPC材料与结构、混凝土结构耐久性、桥梁性能提升等方面的研究工作。主持国家自然科学基金1项、省部级科研项目3项,参研国家重点研发计划、国家杰出青年科学基金、国家自然科学基金重点支持项目等5项。发表学术论文20篇,获国家专利6项。zhangzhongya@cqjtu.edu.cn   
作者简介:  杨俊,工学博士(后),教授,硕士研究生导师,现为重庆交通大学土木工程学院教师、山区桥梁及隧道工程国家重点实验室研究人员,2019年获得重庆交通大学桥梁与隧道工程工学博士学位。主要从事桥梁工程相关的教学科研工作,研究方向包括:旧危桥梁加固与工程结构性能提升;桥梁新结构与超高性能混凝土(UHPC)材料等。发表论文30余篇,主持国家自然科学基金项目2项。
引用本文:    
杨俊, 任伟, 冷景晨, 张中亚, 邹杨, 周建庭, 胡天祥. 超高性能混凝土预应力锚固齿块承压性能研究[J]. 材料导报, 2023, 37(18): 22010146-9.
YANG Jun, REN Wei, LENG Jingchen, ZHANG Zhongya, ZOU Yang, ZHOU Jianting, HU Tianxiang. Research on Local Pressure Performance of Ultra-high Performance Concrete Prestressed Anchor Block. Materials Reports, 2023, 37(18): 22010146-9.
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http://www.mater-rep.com/CN/10.11896/cldb.22010146  或          http://www.mater-rep.com/CN/Y2023/V37/I18/22010146
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