Abstract

Info

Title:: Damage Identification of Welded Ear-plate Connection in Guyed Mast Based on Strain Measurement

Author(s):: WANG Xue-liang; TAN Zhu; WANG Xiao-li; LIU Hui; Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology

Keywords:: guyed mast; weld crack propagation length; fuzzy pattern recognition; strain on ear-plate connection

Abstract:: Base on sensitivity analysis of surface strain of ear-plate connection in guyed mast on crack propagation length, a two level fuzzy pattern recognition method was proposed for the damage of welded ear-plate connection in guyed mast, and was verified by experimental study. The fuzzy pattern database of cable forces and key-point strains of ear-plate connections, as well as weld crack propagation lengths was developed by finite element. 16 ear-plate connection models with different crack lengths were tested, and the key-point strains were measured to identify cable forces and weld crack propagation lengths by the proposed method. The results show that the simulated data in fuzzy database can reflect the actual stress state of ear-plate connection, and the identified weld crack lengths agree well with the actual weld crack lengths. For the different cable forces and crack propagation lengths, the error of identified weld crack length is within 1 mm, the maximum membership degree is greater than 0.8, and the recognition peak is obvious. The recognition technology is feasible and is an effective method to realize the damage intelligent identification of guyed mast.