Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Shear strength of match-cast-free dry joint in precast girders

  • Jiang, Haibo (School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center) ;
  • Feng, Jiahui (School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center) ;
  • Xiao, Jie (School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center) ;
  • Chen, Mingzhu (School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center) ;
  • Liang, Weibin (School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou Higher Education Mega Center)
  • Received : 2019.03.01
  • Accepted : 2020.07.28
  • Published : 2020.08.25
⟨ Previous Next ⟩

Abstract

Shear keys in precast concrete segmental bridges (PCSBs) are usually match-casting which is very labour intensive. In this research, an innovative match-casting-free construction was proposed by leaving small gap between the convex and the concave castellated shear keys in the joints of PCSBs. Specimen experiment, shear strength analysis and numerical simulation were conducted, investigating the loading performance of this new type of dry joints, the gap dry joints. Compared with match-casting joint specimens, it has been found from experiment that shear capacity of gap joint specimens significantly decreased ranging from 17.75% to 42.43% due to only partially constrained and contacted in case of gap dry joints. Through numerical simulation, the effects of bottom contacting location, the heights of the gap and the shear key base were analyzed to investigate strength reduction and methods to enhance shear capacity of gap joint specimens. Numerical results proved that shear capacity of gap dry joints under full contact condition was higher than that under partial contact. In addition, left contact destroyed the integrity of shear keys, resulting in significant strength reduction. Larger shear key base remarkably increased shear capacity of the gap joint. Experimental tests indicated that AASHTO provision underestimated shear capacity of the match-casting dry joint specimens, while the numerical results for the gap dry joint showed that AASHTO provision underestimated shear capacity of full contact specimens, but overestimated that of left contact specimens.

Keywords

Acknowledgement

The research described in this paper was financially supported by National Natural Science Foundation of China [51778150, 51808133], Natural Science Foundation of Guangdong Province in China [2016A030313699], Science and Technology Planning Project of Guangzhou city in China [201804010422], and Special Founds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation [pdjh2020b0179]. The authors gratefully acknowledge the helpful advice given by Prof. A.K.H. Kwan at The University of Hong Kong on the idea of "match-casting-free".

References

  1. AASHTO (2003), Guide Specifications for Design and Construction of Segmental Concrete Bridges: 2003 interim revisions, 2nd Edition, AASHTO, Washington, DC.
  2. ACI (American Concrete Institute) (2014), Building Code Requirements for Structural Concrete, ACI 318-14, Farmington Hills, MI.
  3. Alcalde, M., Cifuentes, H. and Medina, F. (2013), "Influence of the number of keys on shear strength of post-tensioned dry joints", Mater. Constr., 63(310), 297-307. https://doi.org/10.3989/mc.2013.07611.
  4. Bu, Z. and Wu, W. (2018), "Inter shear transfer of unbonded prestressing precast segmental bridge column dry joints", Eng. Struct., 154(1), 52-65. https://doi.org/10.1016/j.engstruct.2017.10.048.
  5. Federation Internationale du Beton (fib) (2010), Model Code 2010-First Complete Draft, Vol. 1, Technical Report, Bulletin 55, Lausanne, Switzerland.
  6. Hussein, H.H., Sargand, S.M., Rikabi, F.T. and Steinberg, E.P. (2017), "Laboratory evaluation of ultrahigh-performance concrete shear key for prestressed adjacent precast Concrete box girder bridges", J. Bridge Eng., 22(2), 04016113. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000987.
  7. Jang, H.O., Lee, H.S., Cho, K. and Kim, J. (2017), "Experimental study on shear performance of plain construction joints integrated with ultra-high performance concrete (UHPC)", Constr. Build. Mater., 152, 16-23. https://doi.org/10.1016/j.conbuildmat.2017.06.156.
  8. Jiang, H., Chen, L., Ma, Z.J. and Feng, W. (2015), "Shear behavior of dry joints with castellated keys in precast concrete segmental bridges", J. Bridge Eng., 20(2), 04014062. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000649.
  9. Jiang, H., Chen, Y., Liu, A., Wang, T. and Fang, Z. (2016a), "Effect of high-strength concrete on shear behavior of dry joints in precast concrete segmental bridges", Steel Compos. Struct., 22(5), 1019-1038. https://doi.org/10.12989/scs.2016.22.5.1019.
  10. Jiang, H., Feng, J., Liu, A., Liang, W., Tan, Y. and Liang, H. (2019), "Effect of specimen thickness and coarse aggregate size on shear strength of single-keyed dry joints in precast concrete segmental bridges", Struct. Concrete, 20(3), 955-970. https://doi.org/10.1002/suco.201800054.
  11. Jiang, H., Wei, R., Ma, Z.J., Li, Y. and Jing, Y. (2016b), "Shear strength of steel fiber-reinforced concrete dry joints in precast segmental bridges", J. Bridge Eng., 21(11), 04016085. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000968.
  12. Kaneko, Y., Connor, J.J., Triantafillou, T.C. and Leung, C.K. (1993), "Fracture mechanics approach for failure of concrete shear key. I: Theory", J. Eng. Mech., 119(4), 681-700. https://doi.org/10.1061/(ASCE)0733-9399(1993)119:4(681).
  13. Kim, H.S., Chin, W.J., Cho, J.R., Kim, Y.J. and Yoon, H. (2015), "An experimental study on the behavior of shear keys according to the curing time of UHPC", Eng., 7, 212-218. http://dx.doi.org/10.4236/eng.2015.74017.
  14. Lee, C.H., Chin, W.J., Choi, E.S. and Kim, Y.J. (2011), "An experimental study on the joints in ultra high performance precast concrete segmental bridges", J. Korea Concrete Inst., 23(2), 235-244. (in Korean) https://doi.org/10.4334/JKCI.2011.23.2.235.
  15. Liu, T., Wang, Z., Guo, J. and Wang, J. (2019), "Shear strength of dry joints in precast UHPC segmental bridges: experimental and theoretical research", J. Bridge Eng., 24(1), 04018100. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001323.
  16. Shamass, R., Zhou, X. and Alfano, G. (2015), "Finite-element analysis of shear-off failure of keyed dry joints in precast concrete segmental bridges", J. Bridge Eng., 20(6), 04014084. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000669.
  17. Turmo, J., Ramos, G. and Aparicio, A.C. (2006), "Shear strength of dry joints of concrete panels with and without steel fibres-Application to precast segmental bridges", Eng. Struct., 28(1), 23-33. https://doi.org/10.1016/j.engstruct.2005.07.001.
  18. Turmo, J., Ramos, G. and Aparicio, A.C. (2012), "Towards a model of dry shear keyed joints: modelling of panel tests", Comput. Concrete, 10(5), 469-487. https://doi.org/10.12989/cac.2012.10.5.469.
  19. Voo, Y., Foster, S. and Voo, C.C. (2015), "Ultrahigh-performance concrete segmental bridge technology: toward sustainable bridge construction", J. Bridge Eng., B5014001. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000704.
  20. Wang, M., Zhang, Y.T. and Tian, W. (2014), "The key technology of short-line matching method in precast segment assembling of externally prestressed concrete bridges", Adv. Mater. Res., 7, 1065-1069. https://doi.org/10.4028/www.scientific.net/AMR.1065-1069.912.
  21. Williams, C.S., Massey, J.B., Bayrak, O. and Jirsa, J.O. (2017), "Investigation of interface shear transfer using push-through tests", ACI Struct. J., 114(1), 173-185. https://doi.org/10.14359/51689162.
  22. Zhou, X., Mickleborough, N. and Li, Z. (2005), "Shear strength of joints in precast concrete segmental bridges", ACI Struct. J., 102(1), 3-11.