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Construction & building materials v.134, 2017년, pp.7 - 17   SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Corrosion-induced flexural behavior degradation of locally ungrouted post-tensioned concrete beams

Zhang, Xuhui (School of Civil Engineering and Architecture, Changsha University of Science & Technology, 410114 Changsha, China ) ; Wang, Lei (School of Civil Engineering and Architecture, Changsha University of Science & Technology, 410114 Changsha, China ) ; Zhang, Jianren (School of Civil Engineering and Architecture, Changsha University of Science & Technology, 410114 Changsha, China ) ; Liu, Yongming (School for Engineering of Matter, Transport and Energy, Arizona State University, 85281 Tempe, AZ, USA ) ;
  • 초록  

    Abstract Strand corrosion within the insufficient grouted duct has become a serious problem affecting the durability of bridge structures. The residual flexural behavior of the locally ungrouted post-tensioned concrete beams after strand corrosion is investigated in the present study. Two experiments are performed: corroded strand test for the constitutive law development and beam test for the flexural behavior investigation. An analytical model is proposed to predict the ultimate strength, the deformation, and the strain response of corroded beams under external loadings. The proposed model considers the strain compatibility between strand and concrete, material mechanics deterioration of strand, and the asymmetric deflection due to local corrosion in ungrouted duct. The accuracy of the model is verified by the experimental observations. Results show that corrosion loss has less effect on the yield strength and elastic modulus than that on the ultimate strain of strand. It is also observed that light corrosion has little effect on the beam cracking and the load-deflection behavior before beam cracking. Severe corrosion degrades significantly the flexural capacity and the local post-cracking stiffness of beams, which leads to the asymmetric deformation and crack formation. Highlights Material property of corroded strand is tested for constitutive law development. Flexural behavior of corroded, locally ungrouted PT beams is experimental studied. Analytical model is proposed to predict the flexural behavior of corroded PT beams.


  • 주제어

    PT beam .   Local grouting .   Strand corrosion .   Flexural behavior .   Analytical model.  

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