What is it about?
The purpose of this study is to assess the structural performance of hollow bridge columns with triangular confining reinforcement. The proposed triangular reinforcement details were equal to the conventional reinforcement details in terms of required structural performance. The triangular confining reinforcement is also economically feasible and rational, and facilitate shorter construction periods. Three hollow cast-in-situ concrete and three precast concrete bridge columns were tested. The behavior of the hollow columns is discussed in terms of their lateral load-drift relationship, cumulative dissipated energy, and lateral load-strain curves. The nonlinear finite element analysis program RCAHEST (reinforced concrete analysis in higher evaluation system technology) was used to analyze hollow bridge columns, and adopted a modified joint element for the precast concrete bridge columns. The results showed that the proposed innovative reinforcement details were superior to the conventional reinforcement details, in terms of the required structural performance.
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Why is it important?
The main aim of this study is to expand the application of the triangular confinement modules to hollow bridge columns with a hollow ratio (inner/outer diameter ratio) to 0.8. Additionally, current study extends the application of precast concrete bridge columns along with the triangular confinement modules.
Perspectives
I hope this article is to provide the triangular reinforcement details for material quantity reduction. The triangular reinforcement details might be an excellent alternative to conventional reinforcement details for easier, more reliable, and more rapid construction. In-depth discussion revealed that the prefabricated triangular confinement modules for precast concrete bridge columns would offer many structural and constructional advantages, such as better concrete confinement, seismic performance, increased moment capacity with outer longitudinal reinforcement, reduced construction time, stability of steel cage modules, minimized tolerance, reduced steel congestion, and material efficiency.
Dr Tae-Hoon Kim
Korea Railroad Research Institute
Read the Original
This page is a summary of: Hollow bridge columns with triangular confining reinforcement, Canadian Journal of Civil Engineering, June 2019, Canadian Science Publishing,
DOI: 10.1139/cjce-2018-0353.
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