Equivalent Model And Its Wind Vibration Analysis Of Transmission Tower Structures On The Bolted Looseness

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. Then structural damage identification method based on ambient excitation becomes one kind of application prospect good choice. Based on this, this article carded on analysis on wind responses around the transmission tower damage. This study offers certain base for the research of damage diagnosis of the transmission tower structure. The main research is as follows:1. In this paper, the author sums up the method of the pulsating wind load simulation, and use three-series method to simulate the pulsating wind load.2. 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.3. Spatial beam element and spatial straight line element are used to build a finite element model (FEM) of Transmission Tower-line System with the MATLAB. Static analysis is applied to Transmission Tower-line System by Newton-Rapshon method, also dynamic Analysis is also applied to the system by Newmark-β.4. Wind-induced Response Analysis of the Transmission Tower-line System with the bolt connection under sound and loosen conditions, educed the influence of bolt connection loosen for Transmission Tower-line System and Local. And conclusion was given, which makes the preparation for the following study of damage diagnosis for bolt connection loosen of Transmission Tower-line System.