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Study of Dynamic Properties of Unbonded Full Prestressed Concrete Simply-supported Beams

Author: LiHongJian
Tutor: ZhangYaoTing
School: Huazhong University of Science and Technology
Course: Structural Engineering
Keywords: Full prestressed beams Frequency Stiffness Deflection Unbonded
CLC: TU378.2
Type: Master's thesis
Year: 2007
Downloads: 64
Quote: 4
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Abstract


Prestressed concrete structure , the actual prestressing tendons size is one of the most important indicators reflect the structure of the force situation accurately predict the effective prestressing tendon structure , is particularly important in the detection and monitoring of structural health . Effective prestressing tendons detection method being carried out the attempt of a variety of methods , but, as noted in the relevant literature , the simple application of the detection method has not yet been successfully developed . In this paper, starting from the dynamic performance of the structure , Experimental and theoretical analysis of the dynamic performance combined to establish a relationship between the tendon pre- tension and frequency by studying the changes in the structural modal parameters under prestress to explore the use of the structure tendons prestressed detection dynamic performance of the non-destructive testing techniques and methods . The were three of unbonded prestressed beam power test , pre- tension is applied to the prestressed beams grading test beam first three frequency modal parameters . The test results show that : with increasing prestress in the case of full- prestressed beams first two order of frequency upward trend ; under prestress beam deflection variation , to prove that the stiffness of the beam with prestressed increases. Papers according to the existing six prestressed concrete simply supported beam test data , to seek a correlation between the pre - tension and frequency of tendon , and deduced the relationship between the contribute tendon pre- tension and stiffness of the beam . Nonlinear constitutive relations starting from the concrete , first explored the reasons for the increase caused by the beam stiffness ; Prestressed Concrete Charpy computing model using optimization software 1stOpt fitting formula of the modulus of elasticity of concrete under prestress , and then obtained for the calculation of the frequency of the test beam . The results show that : accuracy calculation formulas presented in this article . And by comparative analysis of the reasons for the changes caused by the beam stiffness . In this paper, a general-purpose finite element software ANSYS finite element simulation, finite element model of a the unbonded prestressed beam power beam . General model of dynamic analysis , the problems in the treatment of tendon and prestressed the model beam stiffness correction , finite element analysis results show that the model can simulate the frequency of the test beam .

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