Research on Local Pressure Performance of Ultra-high Performance Concrete Prestressed Anchor Block

被引：0
|
作者：
Yang J. [1 ,2 ]
Ren W. [2 ]
Leng J. [2 ]
Zhang Z. [1 ,2 ]
Zou Y. [1 ,2 ]
Zhou J. [1 ,2 ]
Hu T. [3 ]
机构：
[1] State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing
[2] School of Civil Engineering, Chongqing Jiaotong University, Chongqing
[3] Shenzhen Expressway Group Co., Ltd., Guangdong, Shenzhen
来源：
Cailiao Daobao/Materials Reports | 2023年 / 37卷 / 18期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
local effects; local pressure⁃bearing capacity; prestressed anchor block; UHPC;
D O I：
10.11896/cldb.22010146
中图分类号：
学科分类号：
摘要：
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. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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