Electrostatic precipitator is an essential supporting equipment for thermal power plants. Its function is to remove particulate smoke and dust from the flue gas discharged from stoves or oil-fired boilers, thereby significantly reducing the amount of smoke and dust discharged into the atmosphere. This is an important environmental protection device to improve environmental pollution and air quality Its working principle is that when the smoke passes through the flue in front of the main structure of the electrostatic precipitator, the smoke carries a positive charge, and then the smoke enters the channel of the electrostatic precipitator with multiple cathode plates. Due to the mutual adsorption between positively charged smoke and cathode plate, the particulate smoke in the flue gas is adsorbed on the cathode, and the cathode plate is hit regularly, causing the smoke with a certain thickness to fall into the ash hopper below the electrostatic precipitator structure under the dual effects of self weight and vibration, thereby achieving the goal of removing smoke and dust in the flue gas. Due to the large power of thermal power plants, such as 600000 kilowatt units, which burn around 180 tons of coal per hour, the amount of smoke and dust can be imagined. Therefore, the corresponding structure of the electrostatic precipitator is also relatively large. The cross-sectional size of the main structure of the electrostatic precipitator used in general thermal power plants is about 25-40 × If the height of the ash hopper is 10-15m, and the height of the smoke transportation space is increased by 6 meters, the entire height of the electrostatic precipitator is above 35 meters. For such a large steel structure, not only the self weight, smoke load, wind load, and static and dynamic force analysis under seismic loads need to be considered. At the same time, the stability of the structure must also be considered The main structure of the electrostatic precipitator is a steel structure, all welded from section steel, with the outer surface covered with skin (thin steel plate) and insulation material, for the convenience of design, manufacturing, and installation. The structural design adopts a layered form, with each piece consisting of several main beams in a frame style, and the pieces are connected by large beams. In order to install the skin and insulation layer, secondary beams need to be welded between the main beams. For such a large structure, how to connect them according to the physical object will require a huge workload and number of units. According to the actual design requirements of the project and the main structure design of the electrostatic precipitator, the main consideration is the structural strength, stability, and maximum displacement of the suspended cathode plate main beam. For local areas, the fatigue damage of the connection between the cathode plate and the main beam under long-term cyclic impact is mainly investigated; The optimal frequency selection for smoke and dust detachment on the cathode plate; The optimal choice of stiffness between the structural surface skin (thin plate) and the main and secondary beams under wind load, and so on