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Mechanics in Engineering ›› 2017, Vol. 39 ›› Issue (4): 379-383.doi: 10.6052/1000-0879-17-021

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PRACTICAL NONLINEAR ANALYSIS METHOD OF NEW-OLD CONCRETE COMPOSITE BEAMS WITH SHRINKAGE AND CREEP

YANG Weiguo, XU Hongye   

  1. Department of Railway Engineering Hunan Technical College of Railway High-Speed, Hengyang 421002, Hunan, China
  • Received:2017-01-17 Revised:2017-04-28 Online:2017-08-15 Published:2017-08-10

Abstract:

The new-old concrete composite beams are considered as an important engineering beam with a bond-slip in the composite surface. Based on the deformation compatibility relationship across the composite surface of the new-old concrete composite beam, a nonlinear differential equation is derived, for the axial force of the new-old concrete composite beam. The theoretical expressions of the section coordination coefficient are obtained from the equation. With the coordination coefficient, a practical nonlinear analysis method is established, which can exactly describe the shrinkage and the creep of the new-old concrete composite beams. The Bernoulli assumption and the coordination coefficient of the section are duly combined. Compared with the existing analytical solutions, the accuracy can meet the engineering requirements.

Key words:

new-old concrete|composite beams|shrinkage|creep|coordination coefficient|practical analysis method|nonlinear analytical solution

CLC Number: 

  • TU375