Experimentation Study Of Damage Diagnosis To The Drop Of Bolts In The Flange Node Of Transmission Tower

Transmission Tower is a kind of wide applied High-rise Tower structures pattern. Transmission line system is an important lifeline project and the Transmission Tower is the main component of this system. Steel Tube Tower is a kind of transmission tower structure which is always used. The steel pipe mainly joins through the flange bolt and the welding in this structure. The bolt and the welded joint become less crowded or crack in the structure vibrates under the long-term wind load. If discovered not promptly, it could further create the damage expansion. It even could cause structure collapse under the gale function, so the joint damage diagnosis of structures is promptly extremely essential. At present, carries on the manual drive operating have heavy difficulty and high costs to damage diagnosis of the large-scale structure. Based on this, this article carried on analysis on Earthquake harmonic responses around the transmission tower damage, combined with virtual instruments show the results of damage. This study offers certain base for the research of damage diagnosis and health monitoring of the transmission tower structure. The main research is as follows:1. We can see from predecessor's research that the bolt becomes less crowded may equivalent the Stiffness Reduction of the member. On the basis of that, the author has established the complete and loose finite element model of the bolt in flange joint.2. Based on the experiment of shaking table which born the load of sine wave, Signature for damage detection which has nothing to do with the magnitude of load but is sensitive to the damage of structure is extracted. And finally, we successfully identify the location of damage where bolts damaged and dropped off.3. Vibration data from the model of shaking table test was collected by the use of signal acquiring system ,and then were transported ,finally, the locations of damage were successfully identified and diaplayed on the virtual instrument interface. This data was compared by the use of MATLAB, which verified the feasibility of the method.. 4. This article carried on analysis on Earthquake harmonic responses around the transmission tower damage, drawn the related conclusion of damage diagnosis and health monitoring of damage diagnosis and health monitoring of less crowded bolt on the transmission tower structure .And conclusion was given, which makes the preparation for the following study of damage diagnosis for bolt connection loosen of Transmission Tower-line System.