Construction-friendly ductile shear joints for precast concrete panels

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Abstract

The scope of this paper is the shear capacity of in-situ cast joints between precast concrete panels. Current practice with vertical lowering of the wall panels experiences difficulties in the assembly phase, since the traditional U-bar connection requires an overlap in a horizontal plane to allow for the mounting of a vertical locking bar. Where limited space is available bending and subsequent straightening of the U-bars are required to assemble the adjacent panels, a procedure which imposes substantial ductility requirements on the reinforcement as well as some manual workload. This paper introduces a construction-friendly design with U-bars overlapping in the same plane as the panel itself. The design allows for a trouble-free vertical lowering of the panels without pre or post processing of the preinstalled reinforcement loops. Furthermore, an overall more ductile behavior of the joint is obtained. The solution is tested in a push-off experimental setup and the influence of important geometric parameters of the keyed shear joint is investigated. The first peak load carrying capacity is assessed using plasticity models, and the failure modes are identified by the use of digital image correlation. The upper bound models produce satisfactory results capturing the experimental tendencies and predicting the mode of shear failure in the shear keys.
Original languageEnglish
Title of host publicationProceedings of the Second International Conference on Performance–based and Life-cycle Structural Engineering
Number of pages10
Publication date2015
Publication statusPublished - 2015
EventSecond International Conference on Performance–based and Life-cycle Structural Engineering - Brisbane Convention & Exhibition Centre, Brisbane, Australia
Duration: 9 Dec 201511 Dec 2015
Conference number: 2

Conference

ConferenceSecond International Conference on Performance–based and Life-cycle Structural Engineering
Number2
LocationBrisbane Convention & Exhibition Centre
CountryAustralia
CityBrisbane
Period09/12/201511/12/2015

Keywords

  • Precast Structures
  • Shear walls
  • Keyed shear joints
  • Loop connections
  • Ductility
  • Plasticity
  • Upper bound theorem
  • Digital image correlation

Cite this

Sørensen, J. H., Hoang, L. C., Fischer, G., & Olesen, J. F. (2015). Construction-friendly ductile shear joints for precast concrete panels. In Proceedings of the Second International Conference on Performance–based and Life-cycle Structural Engineering