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Static behavior of stud shear connectors with initial damage in steel-UHPC composite bridges

  • Qi, Jianan (Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering, Southeast University) ;
  • Tang, Yiqun (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) ;
  • Xu, Rui (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)
  • Received : 2019.12.01
  • Accepted : 2020.02.17
  • Published : 2020.04.25
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Abstract

For steel-concrete girders made composite using shear studs, initial damage on studs induced by weld defect, unexpected overloading, fatigue and others might degrade the service performance and even threaten the structural safety. This paper conducted a numerical study to investigate the static behavior of damaged stud shear connectors that were embedded in ultra high performance concrete (UHPC). Parameters included damage degree and damage location. The material nonlinear behavior was characterized by multi-linear stress-strain relationship and damage plasticity model. The results indicated that the shear strength was not sensitive to the damage degree when the damage occurred at 2/3d (d is the stud diameter) from the stud root. An increased stud area would be engaged in resisting shear force as the distance of damage location from stud root increased and the failure section becomes inclined, resulting in a less reduction in the shear strength and shear stiffness. The reduction factor was proposed to consider the degradation of the shear strength of the damaged stud. The reduction factor can be calculated using two approaches: a linear relationship and a square relationship with the damage degree corresponding to the shear strength dominated by the section area and the nominal diameter of the damaged stud. It was found that the proposed method is preferred to predict the shear strength of a stud with initial damage.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Southeast University, China Communications Construction Company

This study was supported by the National Natural Science Foundation of China (Grant No. 51908122), the National Key R&D Plan (2017YFC07034), "Zhishan" Scholars Programs of Southeast University, the Technology R&D Project of China Communications Construction Company (Grant No. 2018-ZJKJ-02), and the Fundamental Research Funds for the Central Universities. The financial supports are gratefully appreciated.

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