Experiment on Flexural Behaviour of Rectangular Concrete Filled Steel Tubular Truss Stiffened with PBL(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2017年05期
- Page:
- 171-180
- Research Field:
- Publishing date:
Info
- Title:
- Experiment on Flexural Behaviour of Rectangular Concrete Filled Steel Tubular Truss Stiffened with PBL
- Author(s):
- GAO Yi-min; LIU Yong-jian; JIANG Lei; LIU Jun-ping; LIU Xin-hao
- School of Highway, Chang’an University
- Keywords:
- bridge engineering; rectangular concrete filled steel tubular truss stiffened with PBL; flexural experiment; failure mode; limiting value of vertical deflection; joint deformation; overall deformation
- PACS:
- -
- DOI:
- -
- Abstract:
- Through flexural experiment on 3 rectangular concrete filled steel tubular trusses stiffened with PBL and 1 rectangular concrete filled steel tubular truss, the influences of PBL set inside main pile and width ratio β of main pile and branch pipe on the failure modes of trusses, strains of main pile and branch pipe, and ultimate bearing capacity were studied. The limiting values of vertical deflection of trusses were analyzed, and the influence of joint deformation on overall deformation of truss was discussed. The results show that joint failures occur in rectangular concrete filled steel tubular truss and rectangular concrete filled steel tubular trusses stiffened with PBL. The PBL set inside the tube can change the crack mode of concrete, the crack development is limited, and the steel tube and concrete work better together. The proportion of joint deformation of rectangular concrete filled steel tubular truss and rectangular concrete filled steel tubular trusses stiffened with PBL (β=0.5, 0.75 and 0.875) in overall deformation of truss are 33.43%, 24.44%, 23.69% and 21.44% respectively. The convex deformation of main pile at the region of tension branch pipe is effectively limited by PBL. The proportion of joint in overall deformation of truss deformation decreases, and the bearing capacity of joint is improved. The PBL has no effect on the deformation of main pile at the region of compression branch pipe. For the rectangular concrete filled steel tubular truss bridge and rectangular concrete filled steel tubular truss bridge stiffened with PBL, the limiting value of vertical deflection is 1/500 of truss overall length according to Specifications for Design of Highway Steel Bridge（JTG D64—2015）.
Last Update: 2017-09-11