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Study on Static and Dynamic Properties of Corrosive Prestressed Concrete Beams

Author: MaoWei
Tutor: JiaJinQing
School: Dalian University of Technology
Course: Structural Engineering
Keywords: Prestressed concrete beam Numerical Simulation Corrosion Fatigue
CLC: TU378.2
Type: Master's thesis
Year: 2011
Downloads: 69
Quote: 0
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Abstract


Compared with ordinary reinforced concrete or prestressed concrete members, with nonprestressed prestressed concrete members in the reinforcement in the form and on the mechanical properties is unique, both play the role of prestressed reinforced and full use of the ordinary reinforced, can effective in improving the performance of the prestressed concrete structure, the structural design is more reasonable, and has been widely used in construction projects. Prestressed concrete structure long-term service in corrosive environments, and subjected to frequent repeated loads, although the stress values ??did not reach the yield limit of the material, but the fatigue damage has occurred frequently. This shows that the static and dynamic properties of prestressed concrete structures in corrosive environments is an important part of the engineering structural durability issues. However, the current domestic and international research on this issue is still in its infancy, this article on the basis of the existing research, and the National High Technology Research and Development Program (863 Program) - \prestressed concrete beam of variable cross-section corrosion static and dynamic flexural performance of the experimental study and numerical analysis, the main contents are as follows: 1. use of large general-purpose finite element software ANSYS modeling of steel and concrete, respectively, and by applying constraints equation method to make it work together, established a separate finite element model of prestressed concrete beams. Comparison test, and the results of the numerical simulation of the static mechanical properties of the test beams, to prove the correctness of the model. Not corrosion test beam numerical simulation based on the existing research on the corrosion of steel strand constitutive relation can be simplified, the use of the birth and death element simulation of corrosion and corrosion of prestressed concrete members static mechanical properties, and compared with the experimental results and analysis of the of strand corrosion on the ultimate bearing capacity of the test beams, deformation capacity and failure modes. Statistical analysis of fatigue test results, the corrosion rate and the load amplitude on the fatigue life of the test beam, and by the linear regression method, the the concrete beams corrosion of steel strand SN curve the degree of corrosion on the fatigue life. The use of the SN curve and fatigue damage theory and fatigue life estimation methods to calculate the amplitude loading spectrum under test beam fatigue life estimation of the fatigue life of the test beams using ANSYS and compare the differences between the two.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Prestressed Concrete Structure > Girder
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