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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)
  • 투고 : 2019.12.01
  • 심사 : 2020.02.17
  • 발행 : 2020.04.25

초록

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.

키워드

과제정보

연구 과제 주관 기관 : 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.

참고문헌

  1. AASHTO (2014), Bridge Design Specifications, American Association of State Highway and Transportation Officials, Washington, DC, USA.
  2. Cao, J., Shao, X., Deng, L. and Gan, Y. (2017), "Static and fatigue behavior of short-headed studs embedded in a thin ultrahighperformance concrete layer", J. Bridge Eng., 22(5), 04017005. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001031.
  3. De Larrard, F. and Sedran, T. (1994), "Optimization of ultra-highperformance concrete by the use of a packing model", Cement Concrete Res., 24(6), 997-1009. https://doi.org/10.1016/0008-8846(94)90022-1.
  4. ECS (European Committee for Standardization) (2004), Eurocode 2: Design of Concrete Structures-Part 1-1: General Rules and Rules for Buildings (EN 1992-1-1), Brussels, Belgium.
  5. ECS (European Committee for Standardization) (2005), Eurocode 4: Design of Composite Steel and Concrete Structures, Part 1-1: General Rues and Rules for Buildings (EN 1994-1-1), Brussels, Belgium.
  6. GB50017-2003 (2003), Code for Design of Steel Structures, Beijing, China.
  7. Kim, J.S., Kwark, J., Joh, C., Yoo, S.W. and Lee, K.C. (2015), "Headed stud shear connector for thin ultrahigh-performance concrete bridge deck", J. Constr. Steel Res., 108, 23-30. https://doi.org/10.1016/j.jcsr.2015.02.001.
  8. Kruszewski, D., Wille, K. and Zaghi A.E. (2018), "Push-out behavior of headed shear studs welded on thin plates and embedded in UHPC", Eng. Struct., 173, 429-441. https://doi.org/10.1016/j.engstruct.2018.07.013.
  9. Liu, Y., Zhang, Q., Meng, W., Bao, Y. and Bu, Y. (2019), "Transverse fatigue behaviour of steel-UHPC composite deck with large-size U-ribs", Eng. Struct., 180, 388-399. https://doi.org/10.1016/j.engstruct.2018.11.057.
  10. Meng, W. and Khayat, K.H. (2016), "Mechanical properties of ultra-high-performance concrete enhanced with graphite nanoplatelets and carbon nanofibers", Compos. Part B-Eng., 107, 113-122. https://doi.org/10.1016/j.compositesb.2016.09.069.
  11. Meng, W., Khayat, K.H. and Bao, Y. (2018), "Flexural behaviors of fiber-reinforced polymer fabric reinforced ultra-highperformance concrete panels", Cement Concrete Compos., 93, 43-53. https://doi.org/10.1016/j.cemconcomp.2018.06.012.
  12. Mosaberpanah, M.A. and Eren, O. (2017), "Effect of quartz powder, quartz sand and water curing regimes on mechanical properties of UHPC using response surface modeling", Adv. Concrete Constr., 5(5), 481-492. https://doi.org/10.12989/acc.2017.5.5.481.
  13. Oehlers, D.J. and Park, S.M. (1992), "Shear connectors in composite beams with longitudinally cracked slabs", J. Struct. Eng., 118(8), 2004-2022. https://doi.org/10.1061/(ASCE)0733-9445(1992)118:8(2004).
  14. Qi, J., Hu, Y., Wang, J. and Li, W. (2019a), "Behavior and strength of headed stud shear connectors in ultra-high performance concrete of composite bridges", Front. Struct. Civil Eng., 13(5), https://doi.org/1138-1149. 10.1007/s11709-019-0542-6.
  15. Qi, J., Ma, Z.J. and Wang, J. (2017a), "Shear strength of UHPFRC beams: mesoscale fiber-matrix discrete model", J. Struct. Eng., 143(4), 04016209. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001701.
  16. Qi, J., Wang, J. and Feng, Y. (2019b), "Shear performance of an innovative UHPFRC deck of composite bridge with coarse aggregate", Adv. Concrete Constr., 7(4), 219-229. https://doi.org/10.12989/acc.2019.7.4.219.
  17. Qi, J., Wang, J. and Ma, Z.J. (2018a), "Flexural response of highstrength steel-ultra-high-performance fiber reinforced concrete beams based on a mesoscale constitutive model: Experiment and theory", Struct. Concrete, 19(3), 719-734. https://doi.org/10.1002/suco.201700043.
  18. Qi, J., Wang, J., Li, M. and Chen, L. (2017b), "Shear strength of stud shear connectors with initial damage: experiment, FEM model and theoretical formulation", Steel Compos. Struct., 25(1), 79-92. https://doi.org/10.12989/scs.2017.25.1.079.
  19. Qi, J., Wu, Z., Ma, Z.J. and Wang, J. (2018b), "Pullout behavior of straight and hooked-end steel fibers in UHPC matrix with various embedded angles", Constr. Build. Mater., 191, 764-774. https://doi.org/10.1016/j.conbuildmat.2018.10.067.
  20. Rauscher, S. and Hegger, J. (2008), "Modern composite structures made of high performance materials" Proc., Composite Construction in Steel and Concrete Conf., VI, Devil's Thumb Ranch, Tabernash, CO, ASCE, Reston, VA.
  21. Shao, X., Qu, W., Cao, J. and Yao, Y. (2018), "Static and fatigue properties of the steel-UHPC lightweight composite bridge deck with large U ribs", J. Constr. Steel. Res., 148, 491-507. https://doi.org/10.1016/j.jcsr.2018.05.011.
  22. Sharma, R. and Bansal, P.P. (2019), "Efficacy of supplementary cementitious material and hybrid fiber to develop the ultra high performance hybrid fiber reinforced concrete", Adv. Concrete Constr., 8(1), 21-31. https://doi.org/10.12989/acc.2019.8.1.021.
  23. Wang, J., Guo, J., Jia, L., Chen, S. and Dong, Y. (2017), "Push-out tests of demountable headed stud shear connectors in steel-UHPC composite structures", Compos. Struct., 170, 69-79. https://doi.org/10.1016/j.compstruct.2017.03.004.
  24. Wang, J., Qi, J., Teng, T., Xu, Q. and Xiu, H. (2019), "Static behavior of large stud shear connectors in steel-UHPC composite structures", Eng. Struct., 178, 534-542. https://doi.org/10.1016/j.engstruct.2018.07.058.
  25. Xu, C. and Sugiura, K. (2013), "Parametric push-out analysis on group studs shear connector under effect of bending-induced concrete cracks", J. Constr. Steel. Res., 89, 86-97. https://doi.org/10.1016/j.jcsr.2013.06.011.
  26. Xu, C., Sugiura, K., Wu, C. amd Su, Q. (2012), "Parametrical static analysis on group studs with typical push-out tests", J. Constr. Steel. Res., 72, 84-96. https://doi.org/10.1016/j.jcsr.2011.10.029.