Do axial cyclic tests on boundary zone prisms represent RC walls response? (2020)
RC structural walls are efficient and preferred structural system for building to resist lateral-loads during seismic excitations. Numerous analytical, numerical and experimental investigations have been conducted to study the behavior of RC wall systems under seismic loading, and to develop and modify design guidelines for RC walls. A simplified approach of investigating concrete columns representing boundary zones of walls has also been used extensively to reduce the computational and experimental costs of research programs looking into seismic performance of RC shear walls. However, in most of the reported literature, the representativeness of testing boundary zone prisms to predict the failure modes of RC walls has not been evaluated. In this study, the limitation of axial tests on boundary zone prisms to capture likely failure modes of RC walls is investigated. To evaluate this, tests on three slender RC walls under in-plane cyclic loading and the corresponding RC prisms under axial cyclic loading were conducted. In this paper, details of this experimental campaign are presented and the failure modes observed in the wall units are compared with those of the RC prisms representing their boundary zones. The test matrix comprised three slender RC wall specimens with different transverse reinforcement detailing designed according to NZS3101:2006, and three RC prisms representing their boundary elements. Comparative evaluation of the responses from the tests on RC walls and RC prisms is carried out and the efficacy of this simplified method (i.e. axial testing of boundary zone prisms) to predict the failure modes of RC walls is evaluated. Comparison of the experimental responses suggests that testing the boundary elements as isolated elements makes them susceptible to out-of-plane buckling, and therefore cannot completely represent the failure modes observed in RC walls. In all the tested RC prism specimens, failure due to out-of-plane instability was observed as compared to the failure due to bar buckling, concrete crushing and bar fracture observed during the tests of their prototype RC walls.
CitationTripathi M, Dhakal R, Dashti F (2020). Do axial cyclic tests on boundary zone prisms represent RC walls response?. Sendai, Japan: 17th World Conference on Earthquake Engineering (17WCEE). 27/09/2021-02/10/2021.
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Keywordsboundary elements; shear walls; reinforced concrete; bar buckling; out-of-plane buckling
ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
40 - Engineering::4005 - Civil engineering
RightsAll rights reserved unless otherwise stated
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