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Structural Engineering and Mechanics Volume 18, Number 4, October 2004 , pages 389-410 DOI: https://doi.org/10.12989/sem.2004.18.4.389 |
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Improvement of the earthquake resistance of R/C beam-column joints under the influence of P-D effect and axial force variations using inclined bars |
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A. G. Tsonos
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| Abstract | ||
| In this study, theoretical and experimental results are presented which were obtained during an investigation of the influence of the P-D effect that was caused by the simultaneous changing of the axial load P of the column and the lateral displacement D in the external beam-column joints. The increase or decrease of D was simultaneous with the increase or decrease of the axial compression load P and caused an additional influence on the aseismic mechanical properties of the joint. A total of 12 reinforced concrete exterior beam-column subassemblies were examined. A new model, which predicts the beam-column joint ultimate shear strength, was used in order to predict the seismic behaviour of beam-column joints subjected to earthquake-type loading plus variable axial load and P-D effect. Test data and analytical research demonstrated that axial load changes and P-D effect during an earthquake cause significant deterioration in the earthquake-resistance of these structural elements. It was demonstrated that inclined bars in the joint region were effective for reducing the unfavourable impact of the P-D effect and axial load changes in these structural elements. | ||
| Key Words | ||
| beam-column frame; beams (supports); columns (supports); connections; cyclic loads; earthquake resistant structures; hinges (structural); joints (junctions); reinforced concrete; reinforcing steel; shear strength; structural analysis. | ||
| Address | ||
| Aristotle University of Thessaloniki, Division of Structural Engineering, P. O. Box 482, 541 26, Thessaloniki, Greece | ||