Cyclic Tests of Precast Segmental Concrete Columns With Unbonded Post-Tensioned Tendons

Abstract eng:
Precast segmental concrete column has been used in building and bridge constructions due to its numerous advantages, including accelerated construction speed, less construction site disruption, better construction quality control and less environmental impacts. Its applications are, however, still limited because knowledge about its performance under seismic loading is not enough. Many tests have been reported, but usually on different designs. Also, previous studies focused on testing cantilever-type precast segmental columns, i.e., with only the bottom end of the column fixed. This paper presents a comparative study through testing one monolithic RC column used as the reference, and four segmental columns with different designs to systematically study the influences of 1) placement of energy dissipation (ED) bars; 2) shear keys; and 3) number of segments, on the performance of the segmental columns subjected to cyclic loadings. To be different from the boundary condition of previous studies, rotational freedom of the top end of the columns is restrained in this study. The performance of each design with respect to the reference monolithic RC column in terms of the lateral strength capacity, hysteretic behavior and energy absorption capacity is examined. It was found that adding ED bars could increase the energy dissipation of the segmental column, but lead to larger residual deformation. Concrete shear keys were able to prevent the slip between the segments, but severe damage could occur due to stress concentration surrounding the shear keys. The number of segments had insignificant influence on the performance of segmental column. Further study will be carried out to improve the identified shortcomings so as to derive better performing segmental columns for practical applications in constructions in seismic regions.

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