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  Volume 7, Number 4, October 2022 , pages 281-295
DOI: https://doi.org/10.12989/acd.2022.7.4.281
 

Uniaxial tensile test integrated design considering mould-fixture for UHPC
Xiaochen Zhang, Chao Shen, Xuesen Zhang, Xiangguo Wu, Qiu Faqiang and Josue G. Mitobaba

 
Abstract
    Tensile property is one of the excellent properties of ultra-high performance concrete (UHPC), and uniaxial tensile test is an important and challenging mechanical performance test of UHPC. Traditional uniaxial tensile tests of concrete materials have inherent defects such as initial eccentricity, which often lead to cracks and failure in non-test zone, and affect the testing accuracy of tensile properties of materials. In this paper, an original integrated design scheme of mould and end fixture is proposed, which achieves seamless matching between the tension end of specimen and the test fixture, and minimizes the cumulative eccentricity caused by the difference in the matching between the tension end of specimen and the local stress concentration at the end. The stress analysis and optimization design are carried out by finite element method. The curve transition in the end of specimen is preferred compared to straight line transition. The rationality of the new integrated design is verified by uniaxial tensile test of strain hardening UHPC, in which the whole stress-strain curve was measured, including the elastic behavior before cracking, strain hardening behavior after cracking and strain softening behavior.
 
Key Words
    finite element analysis; mould integration; uniaxial tension; ultra-high performance concrete; test fixture
 
Address
Xiaochen Zhang and Josue G. Mitobaba: School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China

Chao Shen: Shanghai Fengling Renewables Co., Ltd. Shanghai 200021, China

Xuesen Zhang: CGN New Holdings Co., Ltd, Beijing 100070, China

Xiangguo Wu: College of Civil Engineering, Fuzhou University, Fuzhou, 350108, China/ Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of the Industry and Information Technology, Harbin Institute of Technology, Harbin, 150090, China

Qiu Faqiang: JianYan Test Group Co., Ltd, Xiamen 361004, China
 

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