Opabola, Eyitayo A;
Elwood, Kenneth J;
(2023)
Flexure-axial-shear interaction of ductile beams with single-crack plastic hinge behaviour.
Earthquake Engineering & Structural Dynamics
10.1002/eqe.3873.
(In press).
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Abstract
One of the key damage observations in modern reinforced concrete (RC) frame buildings, damaged following the 2010/2011 Canterbury and 2016 Kaikoura earthquakes, was localised cracking at the beam-column interface of capacity-designed beams. The localised cracking in the beams was due to curtailed longitudinal bars at the beam-column interface. Following these observations, without experimental data to justify desirable seismic performance, modern beams controlled by localised cracking were assumed to be potentially earthquake-vulnerable. To address this, an experimental program was carried out on six RC beam specimens susceptible to single-crack plastic hinge behaviour due to curtailed longitudinal bars. The experimental data show that RC beams with single-crack plastic hinge behaviour can undergo significant inelastic drift demands without loss of lateral resistance. However, contrary to conventional beams with distributed cracking, the response of RC beams with single-crack plastic hinge behaviour due to curtailed longitudinal bars is mainly dominated by hinge rotation (via bond-slip) and shear sliding at the column face. The current paper studies the interdependence of axial elongation, bond-slip and shear sliding deformation of RC beams with single-crack plastic hinge behaviour under cyclic demands. A procedure for seismic assessment of RC beams with single-crack plastic hinge behaviour due to curtailed longitudinal bars is proposed. The proposed formulations can be adopted to develop adequate numerical models for simulating the response of RC frames with beams susceptible to single-crack plastic hinge behaviour due to curtailed longitudinal bars.
| Type: | Article |
|---|---|
| Title: | Flexure-axial-shear interaction of ductile beams with single-crack plastic hinge behaviour |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/eqe.3873 |
| Publisher version: | https://doi.org/10.1002/eqe.3873 |
| Language: | English |
| Additional information: | © 2023 The Authors. Earthquake Engineering & Structural Dynamics published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | axial elongation, deformation capacity, ductile beam, localised cracking, shear sliding, single-crack |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10168035 |
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