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Title: Two-step detection method of compressed member instability damage of transmission towers
Authors: Qu, WL
Jiang, Z
Xia, Y 
Xu, YL 
Issue Date: Dec-2011
Source: Dynamics for sustainable engineering : proceedings of the 14th Asia-Pacific Vibration Conference, 5-8 December 2011, Hong Kong, v. 2, p. 531-538
Abstract: The transmission tower is prone to the strong wind and catastrophic wind, which may cause the collapse of the tower. The major members of lower body may begin to buckling under compressed force and finally collapse due to the compression induced instability. Therefore, the accurate and timely identification on instability damage of major members is essential for the structural strengthening and the prevention of tower collapse. The relationship among axial compressing force, bending moment, and axial stiffness of the major member is established based on numerical simulation with the aiding of commercial package ANSYS. Thus, a two-step detection method for the instability of major member of transmission tower is proposed: (I) The changing rate of three order wavelet packet energy curvature of nodal floor of the transmission tower is selected as a new index to detect the possible damage region; (2) Modal strain energy and interval estimation is utilized to determine the exact position of damaged major members. Finally, a real transmission tower constructed in China is taken as an example to examine the feasibility and possibility of the proposed approach. The made observations indicate that the detection quality of the two-step approach developed in this study is satisfactory.
Keywords: Axial stiffness
Damage detection
Changing rate of wavelet packet energy curvature
Modal strain energy
Interval estiamtion
Publisher: Department of Civil and Structural Engineering and Department of Mechanical Engineering, The Hong Kong Polytechnic University.
ISBN: 978-962-367-732-5
Rights: Copyright ©2011 Department of Civil and Structural Engineering and Department of Mechanical Engineering, Hong Kong Polytechnic University
Posted with permission of the publisher.
Appears in Collections:Conference Paper

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