Structure Performance And Earthquake Response Analysis For 600MW Steel Platform Of Air-Cooling Island

At present, several direct air-cooling units which can save mass water have been run in the rich coal and water depletion northwest of our country. Direct atmospheric condenser technology is a new type of cooling water process, Having environmental protection, conservation of water resources, higher overall, efficiency advantages and so on. So the technology used in the plant is more broad application prospects.Support structure system of air cooled condenser is a kind of new structural system, which is appeared with air cooled techniques. It is different with general structural style because the process layout restrictions of the atmospheric condenser structure, the vertical stiffness and quality is serious uneven, that the above is bigger than the below, the structure is contrary to the conventional structure. It is belong to the style of non-uniform distribution of stiffness and along vertical direction. As a main strut structure system, it bears many kinds of complex dynamic load and environmental function.In this paper, SAP2000 finite element code is used to analysis structure's modality. Structure's endogen force and displacement under each kind of load (dead load; live load; wind load; snow load) are also calculated; based on theoretical analysis and finite element calculation, studied on influence of the interferential force, which was produced by big fan under working condition, given to the structure. And pushover analytical method is used to analyze the earthquake-resistant performance of this kind of structures. The results show that, structure's tensional effect is obvious; under earthquake structure's vibration is very complex. The big fan under working condition will surmount the structure base frequency, which will cause the structure to resonate. Although support structure system for the air cooled condenser system can satisfy the earthquake resistance request, but because the reinforced concrete tube column is the mainly dissipative element, so the structure's earthquake resistance garrisons is too solely.This research may help us to understand this kind of vertical hybrid structure's force transmission mechanism, and may accelerate its design domestic product advancement.