Structural Engineering and Mechanics

  • 제75권1호
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  • Pages.49-57
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  • 2020
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Full-scale testing on the flexural behavior of an innovative dovetail UHPC joint of composite bridges

  • Qi, Jianan (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering, Southeast University) ;
  • Cheng, Zhao (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering, Southeast University) ;
  • Wang, Jingquan (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering, Southeast University) ;
  • Zhu, Yutong (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering, Southeast University) ;
  • Li, Wenchao (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering, Southeast University)
  • 투고 : 2019.06.04
  • 심사 : 2020.02.10
  • 발행 : 2020.07.10
⟨ 이전 논문 다음 논문 ⟩

초록

This paper presents a full-scale experimental test to investigate the flexural behavior of an innovative dovetail ultra-high performance concrete (UHPC) joint designed for the 5th Nanjing Yangtze River Bridge. The test specimen had a dimension of 3600 × 1600 × 170 mm, in accordance with the real bridge. The failure mode, crack pattern and structural response were presented. The ductility and stiffness degradation of the tested specimens were explicitly discussed. Test results indicated that different from conventional reinforced concrete slabs, well-distributed cracks with small spacing were observed for UHPC joint slabs at failure. The average nominal flexural cracking strength of the test specimens was 7.7 MPa, signifying good crack resistance of the proposed dovetail UHPC joint. It is recommended that high grade reinforcement be cooperatively used to take full advantage of the superior mechanical property of UHPC. A new ductility index, expressed by dividing the ultimate deflection by flexural cracking deflection, was introduced to evaluate the post-cracking ductility capacity. Finally, a strut-and-tie (STM) model was developed to predict the ultimate strength of the proposed UHPC joint.

키워드

과제정보

This study was supported by the National Natural Science Foundation of China (Grant No. 51908122, U1934205, 51678140), "Zhishan" Scholars Programs of Southeast University, the Technology R&D Project of China Communications Construction Company (grant number: 2018-ZJKJ-02) and the Fundamental Research Funds for the Central Universities (2242019K40073, 2242019R10). The financial supports are gratefully appreciated.

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