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Improvement of the earthquake resistance of R/C beam-column joints under the influence of P-△ effect and axial force variations using inclined bars

  • Tsonos, Alexander G. (Aristotle University of Thessaloniki, Division of Structural Engineering)
  • 투고 : 2003.02.13
  • 심사 : 2004.03.24
  • 발행 : 2004.10.25

초록

In this study, theoretical and experimental results are presented which were obtained during an investigation of the influence of the $P-{\Delta}$ effect that was caused by the simultaneous changing of the axial load P of the column and the lateral displacement ${\Delta}$ in the external beam-column joints. The increase or decrease of ${\Delta}$ 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 $P-{\Delta}$ effect. Test data and analytical research demonstrated that axial load changes and $P-{\Delta}$ 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 $P-{\Delta}$ effect and axial load changes in these structural elements.

키워드

참고문헌

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  7. A simplified shear model for reinforced concrete elements subjected to reverse lateral loadings vol.2, pp.1, 2012, https://doi.org/10.2478/s13531-011-0055-0
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  11. Strut-and-tie model for shear strength prediction of RC exterior beam-column joints under seismic loading vol.18, pp.4, 2020, https://doi.org/10.1007/s10518-019-00756-4