Computers and Concrete

  • 제26권2호
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  • Pages.161-173
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  • 2020
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
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)
  • 투고 : 2019.03.01
  • 심사 : 2020.07.28
  • 발행 : 2020.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

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".

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