Fine Damage Identification Method of Transmission Tower Based on Concurrent Multi-Scale Modeling

Abstract:

In order to study the damage problem caused by the transmission tower fatigue cracks and bolt pretightening force loss ,this paper proposes a transmission tower damage identification method based on concurrent multi-scale model, namely establish solid model on nodes of fatigue crack and bolt looseness based on large scale model., subdividing elements size. Take a practical engineering 500kV transmission towers as an example to establish a concurrent multi-scale models. This paper simulates 8 kinds of conditions including bolt pretightening force loss and angle steel crack, research shows that the sum of wavelet packet energy curvature difference can effectively identify minute damage, and then get the function relation between damage level and damage index with no noise interference, also this provides a theoretical basis for it as actual damage monitoring indicators index.

• Periodical: Applied Mechanics and Materials (Volume 680)
• Pages: 374-378
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.680.374
• Online since: October 2014
• Authors: Chun Cheng Liu, Shang Yu Hou*, Wen Qiang Li, Zhao Wen He
• Keywords: Damage Detection, Multi-Scale, transmission tower, Wavelet Packet Energy Curvature Difference

References

[1] R. Scotta, L. Tesser, R. Vitaliani, et al. Global damage indexes for the seismic performance assessment of RC structures[J]. Earthquake Engineering & Structural Dynamics, 2009, 38(8): 1027-1049.

DOI: 10.1002/eqe.882

[2] Li Zhaoxia, Li Aiqun, Tommy Chan Hungtin, et al. Finite Element Modeling for Health Monitoring and Condition Assessment of Long-span Bridges[J]. Joural of southeast University(Natural Science Edition), 2003, 33(5): 562-572.

[3] Ding Youliang, Li Aiqun, Miao Changqing, et al. Multi-level Finite Element Modeling of Long-span Bridges for Structure Damage Diagnosis and Safety Evaluation[J]. Eathquation Engineering and Engineering Vibration, 2006, 26(2): 66-72.

[4] DING You-liang, LI Ai-qun, MIAO chang-qing. Investigation on the structural damage alarming method based on wavelet packet energy spectrum [J]. Engineering Mechanics, 2006, 23(8): 42-48.

[5] TAN Dong-Mei, QU Wei-lian, QIN Wen-ke. Damage Identification of Transmission Tower Based on Wavelet Packet Transform and Fuzzy Clustering[J]. Journal of Tianjin University, 2011, 44(8): 695-700.