• ISSN 0258-2724
  • CN 51-1277/U
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Volume 20 Issue 6
Dec.  2007
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Article Contents
XU Xun, QIANG Shizhong. New Model for Full Process Analysis of Bearing Behavior of Externally Prestressed Concrete Beams[J]. Journal of Southwest Jiaotong University, 2007, 20(6): 732-738.
Citation: XU Xun, QIANG Shizhong. New Model for Full Process Analysis of Bearing Behavior of Externally Prestressed Concrete Beams[J]. Journal of Southwest Jiaotong University, 2007, 20(6): 732-738.

New Model for Full Process Analysis of Bearing Behavior of Externally Prestressed Concrete Beams

  • Received Date: 12 Mar 2007
  • Publish Date: 25 Dec 2007
  • Based on FEM(finite element method),a numerical model for an externally prestressed concrete beam was proposed by considering the material and geometrical nonlinearities of this structure in order to investigate its behavior at the ultimate state of bearing capacity.In this model,a grid-section model is introduced to determine the sectional tangent stiffness of reinforced concrete beam element and analyze its degeneration process,and three-node friction-sliding tendon elements are employed to analyze the friction and sliding of external tendons at deviators or sliding blocks.Furthermore,major factors affecting the structural behavior,altogether with the axial second-order moment and the second-order effect,are taken into account in this model.The capability and efficiency of the proposed model were verified by comparing the numerical and experimental results of the characteristic parameters,the external prestress increment,the friction-sliding effect and the second-order effect of experimental beams.The research results show that the friction and sliding of external tendons at deviators or sliding blocks are important factors affecting the structural behavior.

     

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