Structural Engineering and Mechanics

  • 제54권3호
  • /
  • Pages.501-520
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  • 2015
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Effect of tension stiffening on the behaviour of square RC column under torsion

  • Mondal, T. Ghosh (Department of Civil Engineering, Indian Institute of Technology Hyderabad) ;
  • Prakash, S. Suriya (Department of Civil Engineering, Indian Institute of Technology Hyderabad)
  • 투고 : 2014.09.13
  • 심사 : 2015.01.13
  • 발행 : 2015.05.10
⟨ 이전 논문 다음 논문 ⟩

초록

Presence of torsional loadings can significantly affect the flow of internal forces and deformation capacity of reinforced concrete (RC) columns. It increases the possibility of brittle shear failure leading to catastrophic collapse of structural members. This necessitates accurate prediction of the torsional behaviour of RC members for their safe design. However, a review of previously published studies indicates that the torsional behaviour of RC members has not been studied in as much depth as the behaviour under flexure and shear in spite of its frequent occurrence in bridge columns. Very few analytical models are available to predict the response of RC members under torsional loads. Softened truss model (STM) developed in the University of Houston is one of them, which is widely used for this purpose. The present study shows that STM prediction is not sufficiently accurate particularly in the post cracking region when compared to test results. An improved analytical model for RC square columns subjected to torsion with and without axial compression is developed. Since concrete is weak in tension, its contribution to torsional capacity of RC members was neglected in the original STM. The present investigation revealed that, disregard to tensile strength of concrete is the main reason behind the discrepancies in the STM predictions. The existing STM is extended in this paper to include the effect of tension stiffening for better prediction of behaviour of square RC columns under torsion. Three different tension stiffening models comprising a linear, a quadratic and an exponential relationship have been considered in this study. The predictions of these models are validated through comparison with test data on local and global behaviour. It was observed that tension stiffening has significant influence on torsional behaviour of square RC members. The exponential and parabolic tension stiffening models were found to yield the most accurate predictions.

키워드

참고문헌

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피인용 문헌

  1. Nonlinear Finite-Element Analysis of RC Bridge Columns under Torsion with and without Axial Compression vol.21, pp.2, 2016, https://doi.org/10.1061/(ASCE)BE.1943-5592.0000798
  2. Analytical and finite element studies on behavior of FRP strengthened RC beams under torsion vol.153, 2016, https://doi.org/10.1016/j.compstruct.2016.07.014
  3. Improved softened truss model for reinforced concrete members under combined loading including torsion pp.1537-6532, 2019, https://doi.org/10.1080/15376494.2018.1534171
  4. Hysteresis modelling of reinforced concrete columns under pure cyclic torsional loading vol.64, pp.1, 2015, https://doi.org/10.12989/sem.2017.64.1.011
  5. Optimization-Based Improved Softened-Membrane Model for Rectangular RC Members under Combined Shear and Torsion vol.145, pp.2, 2019, https://doi.org/10.1061/(asce)st.1943-541x.0002228