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International Journal of Civil Engineering

, Volume 16, Issue 8, pp 887–895 | Cite as

Experimental Study on the Long-Term Behaviour of RBPC T-Beams

  • Guohui Cao
  • Wang Zhang
  • Jiaxing Hu
  • Kai Zhang
Research paper

Abstract

This study compares the mechanical properties of the retard-bonded and conventionally bonded prestressed concrete (RBPC and BPC, respectively) under uniform loads. Results show that the prestressed strands and concrete of the RBPC T-beams are firmly bonded with harden of retard-bonded materials, thereby exhibiting the same mechanical properties as that of the BPC beams. The growth rate of the long-term deflections of the RBPC T-beam is slightly lower than that of the BPC T-beam. Given the effect of concrete shrinkage, creep and time variation of prestress loss, the regular patterns of deflection growth of the RBPC T-beam mid-spans are analysed based on the age-adjusted effective modulus method, method of equivalent prestress load and calculation model of prestress loss. Accordingly, the long-term deflection development curves of the RBPC T-beam mid-spans under self-weight, prestressing force and external loads are obtained. Calculation results are in good agreement with the test results. This method has immense applicability for the computation of the RBPC T-beams, and can be used to estimate the long-term deflection growth of regular patterns of the RBPC components.

Keywords

Retard-bonded Prestressed concrete Beams and girders Deflection Creep 

Notes

Acknowledgements

The research described in this paper was financially supported by National Natural Science Foundation of China (Grant No. 51551801) and Natural Science Foundation of Hunan Province of China (Grant No. 14JJ4062).

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Copyright information

© Iran University of Science and Technology 2017

Authors and Affiliations

  1. 1.College of Civil EngineeringHunan City UniversityYiyangPeople’s Republic of China
  2. 2.College of Civil Engineering and ArchitectureChangsha University of Science and TechnologyChangshaPeople’s Republic of China
  3. 3.College of Civil EngineeringHunan UniversityChangshaPeople’s Republic of China

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