Research On Damage Identification Of Transmission Tower Based On Residual Force Vector And Cloud Reasoning

Nowadays,with the continuous advancement of science and technology,the civil engineering structure has also developed rapidly.There are new breakthroughs in scale and structure,which bring great convenience to people's work and life.However,once the structure is destroyed,it will be seriously threatened.People's lives and property are safe.Therefore,it is more and more important to carry out health detection and damage identification of structures,and it has gradually become an important development direction in the field of civil engineering.In this paper,based on the three-dimensional transmission tower structure for damage identification,the characteristics and improvement of the residual force vector method are studied,and more suitable indicators are found.The content includes:(1)The residual force vector method is applied to the two-dimensional truss structure,and the damage is simulated by the reduction of the stiffness of the member.The damage is identified in the noiseless and different noise environments,and the insufficiency of the residual force vector method is analyzed.This is improved to improve the noise immunity of the method;(2)Introduce the uncertainty reasoning of the cloud model based on the residual force vector method,and use the cloud model to combine the randomness and fuzziness of the object to perform the damage identification on the same two-dimensional truss structure,and compare the recognition results of the two methods.Difference(3)Apply the cloud inference based on the residual force vector method to the three-dimensional transmission tower structure,and consider the recognition results when the noise level is 0.02,0.04,and 0.06,respectively,by comparing the interference bars(the bar identification value is greater than The number of specified damage values is 60% or greater than the identification value of the specified damage bar.(4)Further improve the residual force index and propose the conversion modal index,which is only related to the structural vibration mode.The cloud inference database of the structural transformation mode under each damage state is established to identify the transmission tower under the same damage condition.The recognition results of the residual force index and the conversion modal index are compared.