Tensile Capacity of U-bar Loop Connections with Precast Fiber Reinforced Dowels

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Abstract

This paper describes an investigation of the tensile capacity of in-situ cast U-bar loop connections between precast concrete elements. The basic idea is to introduce a small precast cylindrical dowel of fiber reinforced mortar that fits into the bend diameter of the overlapping U-bars. The remaining part of the connection is cast in-situ with a regular mortar, which then encapsulates the precast dowel. Different dowel configurations have been investigated, including the use of steel or synthetic fibers with or without lacer bars placed within the precast dowel.
The experimental results show that use of a precast fiber reinforced dowel performs at a slightly lower load level, as compared to a connection grouted solely with regular mortar and reinforced with the same amount of transverse reinforcement. However, the load-displacement response of specimens with a fiber reinforced dowel is closer to ideal ductile behavior than that of the specimens grouted with regular mortar. The experimental results of the tensile tests are compared with calculations based on an upper bound plasticity model and satisfactory agreement has been obtained.
Original languageEnglish
Title of host publicationfib Symposium 2016: Performance-based approaches for concrete structures : Proceedings
Number of pages11
Publication date2016
Publication statusPublished - 2016
Event fib Symposium 2016: Performance-based approaches for concrete structures - Cape Town, South Africa
Duration: 21 Nov 201623 Nov 2016

Conference

Conference fib Symposium 2016
CountrySouth Africa
CityCape Town
Period21/11/201623/11/2016

Keywords

  • Loop Connections
  • Tensile Capacity
  • Fiber Reinforced Concrete
  • Upper Bound Method

Cite this

Sørensen, J. H., Hoang, L. C., Olesen, J. F., & Fischer, G. (2016). Tensile Capacity of U-bar Loop Connections with Precast Fiber Reinforced Dowels. In fib Symposium 2016: Performance-based approaches for concrete structures: Proceedings