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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Junqing Lei,Shanshan Cao,Guoshan Xu,Yun Xiao.Simulation of Fatigue Stiffness Degradation in Prestressed Concrete Beams under Cyclic Loading[J].Journal of Harbin Institute Of Technology(New Series),2016,23(1):67-74.DOI:10.11916/j.issn.1005-9113.2016.01.010.
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Simulation of Fatigue Stiffness Degradation in Prestressed Concrete Beams under Cyclic Loading
Author NameAffiliation
Junqing Lei School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 
Shanshan Cao School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 
Guoshan Xu School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China 
Yun Xiao School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 
Abstract:
In order to investigate and research the fatigue cracking of prestressed concrete fatigue properties and loading and stiffness degeneration process,cyclic loading tests were carried out on six prestressed concrete beams and the stiffness degradation under fatigue was investigated. A simulation model of stiffness degradation is proposed based on the stiffness analysis of the fatigue-damaged section. The elastic modulus of damaged concrete and the effective residual area of steel were introduced as well as an adjusted three-stage concrete fatigue damage evolution model. The strip method was used to analyze concrete damage due to changing stress along the depth of the beam section. The simulation and test results were compared and a method of predicting fatigue deflection was presented based on the simulation model. The predicted results were compared with that of the neural network method. It is in good agreement for the simulation results with the test results. It is only less than 5% error for the simulation model which can reveal the two-stage degradation of prestressed concrete beams under cyclic loading. It is more precise for the simulation prediction method under proper conditions.
Key words:  prestressed concrete beam  fatigue  stiffness degradation simulation  damaged concrete elastic modulus  steel effective residual area  deflection prediction
DOI:10.11916/j.issn.1005-9113.2016.01.010
Clc Number:U441
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