Effect of Material Degradation on Fatigue Properties of Steel-Concrete Composite Bridge Welds

Lang Liu; Xidong Zhang

doi:10.13206/j.gjgS21080901

Volume 37 Issue 6

Sep. 2022

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Lang Liu, Xidong Zhang. Effect of Material Degradation on Fatigue Properties of Steel-Concrete Composite Bridge Welds[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(6): 9-17. doi: 10.13206/j.gjgS21080901

Citation:

Lang Liu, Xidong Zhang. Effect of Material Degradation on Fatigue Properties of Steel-Concrete Composite Bridge Welds[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(6): 9-17. doi: 10.13206/j.gjgS21080901

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Effect of Material Degradation on Fatigue Properties of Steel-Concrete Composite Bridge Welds

doi: 10.13206/j.gjgS21080901

Lang Liu^1,2,
Xidong Zhang²

1. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Received Date: 2021-08-09
Available Online: 2022-09-02

Abstract

Abstract

In order to study the influence of material degradation on the fatigue performance of steel-concrete composite beam bridge welds,the weight loss rate of reinforcement and steel plate and the time-varying strength of concrete are calculated according to the law of reinforcement corrosion,the law of concrete strength and the law of steel corrosion.The finite element model of degraded bridge was established by using ANSYS software.Taking the weld joint at the junction of main beam mid span web and lower flange as the research object,firstly,under the action of AASHTO standard fatigue vehicle,the stress time history of the welded joints of the main beam under different degradation conditions was extracted,and the influence of material degradation on the joint stress was discussed;then,based on Miner's linear cumulative damage theory,the fatigue damage development curves under different degradation years were calculated,the influence of material degradation on the fatigue damage curve was analyzed,and the variation laws of the maximum stress amplitude and the number of equivalent stress cycles of the bridge were discussed;finally,the fatigue damage ratio was defined to study the effect of material degradation on the fatigue damage of welding details of composite beam bridge.
The results show that the stress in the weld joint area is easily affected by material degradation.The stress value of the weld joint increases with the increase of degradation years,and the closer the loading position is,the greater the stress value is.The fatigue damage development curve of bridge welding details shows a linear growth trend,and material degradation will lead to the acceleration of fatigue damage accumulation of fatigue details.When reaching the design basis,the maximum increase of fatigue damage value reaches 7.5 times;the maximum stress amplitude is more sensitive to material degradation,and the growth rate of the maximum stress amplitude generated by fatigue details shows an increasing trend.The growth rates of the stress amplitude of the four nodes in the 100-year degradation condition reach 10.4%,13.6%,8.5% and 14.7% respectively.However,the growth rate of the number of equivalent stress cycles does not show an obvious law.The fatigue damage ratio increases nonlinearly with the degradation time.When the degradation time is 100 years,the fatigue damage ratio of beam bridges is 7.0,7.4,6.4 and 7.52 respectively.In addition,the greater the degree of structural degradation is,the higher the nonlinear degree of fatigue damage ratio is.
- material deteriorationdegradation,
- composite girder bridge,
- fatigue damage,
- stress amplitude

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References(28)

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