钢管混凝土柱的非线性振动特性分析与脱粘识别

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Abstract De-bonding of concrete-filled steel tube columns greatly affects structural load-bearing performance, and de-bonding detection receives many researchers’ attention. Here, 5 specimens of cantilevered concrete-filled steel tube columns with different de-bonding states were fabricated, and free vibration acceleration signals of 6 measured points on each specimen surface were recorded simultaneously under hammering excitation. The first order frequency component of recorded signals was separated with the analytical mode decomposition, and then Hilbert transformation was used to get frequency-amplitude curves. The frequency-amplitude curves showed that the specimens without de-bonding reveal stronger nonlinear vibration characteristics, and they are similar to weak Duffing systems; de-bonding existence weakens the specimens’ nonlinear characteristics, the larger the de-bonding area, the smaller the nonlinear coefficients’ absolute values; the closer to de-bonding position the signal measurement point, the weaker the nonlinear characteristics, and the smaller the nonlinear coefficient absolute values; nonlinear coefficients are sensitive to de-bonding and independent of component fabrication and boundary conditions, so they are good indexes to recognize de-bonding of concrete filled steel tube columns.

Key words： concrete-filled steel tube columns nonlinear vibration characteristics recognition of de-bonding analytical mode decomposition Duffing system

Received: 19 April 2018 Published: 28 December 2019

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	Articles by authors
	CAO Hui1
	2
	LI Yaxiang1

Cite this article:

CAO Hui1,2,LI Yaxiang1. Nonlinear vibration characteristics and de-bonding recognition of concrete-filled steel tube columns[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(1): 260-265.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I1/260

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