组合梁疲劳后的刚度退化规律及计算模型

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Abstract To investigate the degradation of stiffness of steel-concrete composite beams under fatigue loading, six test beams with stud connectors were designed and fabricated to perform the static and fatigue tests.First, the failure modes of the specimens after different number of fatigue load cycles were compared.The variation of load-deflection curves, residual deflection and relative slip of composite beams during fatigue loading were emphatically analyzed.Then, the correlation between the stiffness degradation of each test beam and the residual deflection and relative slip growth during the fatigue test was analysed.The substantial reasons for the stiffness degradation of composite beams were discussed.Finally, based on the stiffness degradation function under the fatigue load and by parameter fitting, a calculation model for the residual stiffness of composite beams in consideration of the number of fatigue load cycles was established.The results show that the stiffness of composite beams will undergo irreversible degradation under fatigue loading.Stiffness degradation, in practical, shows the macro-behavior of material fatigue damage and shear connection degradation.The stiffness degradation of composite beams shows an “S” monotonous decreasing trend with the increase of fatigue cycles.By using the established stiffness degradation model of composite beams,the calculated values are in good agreement with the experimental ones, showing its good applicability.The research results provide an idea and method for establishing the stiffness degradation model of composite beams after fatigue loading.

Key words： steel-concrete composite beam fatigue stiffness degradation relative slip bridge

Received: 14 August 2019 Published: 28 March 2021

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	Articles by authors
	WANG Bing1
	HUANG Qiao2
	LIU Xiaoling3

Cite this article:

WANG Bing1,HUANG Qiao2,LIU Xiaoling3. Stiffness degradation and its calculation model for composite beams after fatigue[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(6): 265-271.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I6/265

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