Analysis On Responses Of 1000MW Air Cooled Condenser Structure Under Settlement

Air cooled condenser platform is a kind of new structural system, which is appeared with air cooled techniques. Due to the process layout restriction of the atmospheric condenser structure, the vertical stiffness and quality is serious uneven, that the above is bigger than the below, long span and cantilever, the structure is contrary to the conventionnal structure.Because the air cooled condenser platform has characteristics of long span and cantilever, the asymmetrical settlement will make the structure produce deformation greatly, the cantilever side especially, but the technology request the steel truss of air cooled condenser platform should have a good smooth level degree to insure the normal usage of equipments, so it is necessary to study the internal force and deformation of the air cooled condenser platform under the asymmetrical settlement.This text uses SAP2000 finite element software first to analysis the cantilever side's internal force and deformation of the air cooled condenser platform under the load. Secondly, to analysis the cantilever side's internal force and deformation of the air cooled condenser platform under the work condition that single pillar settlement and multiple pillar settlement, It takes six kinds of work condition according to the symmetry of structure in the case of single pillar settlement; in the case of multiple pillar settlement, it takes five kinds of work condition according to the extent of participating settlement of corner pillar, medium pillar and side pillar, namely corner pillar not settle medium pillar and side pillar settle, medium pillar not settle corner pillar and side pillar to settle, parts of side pillars settle and parts of medium pillar settle, corner pillar and side pillar settle and parts of medium pillar settle ,and, adjoining pillar alternately settle, then get the internal force and deformation of cantilever side under the asymmetry settlement, at last, the result is compared with that under load to analysis influence of cantilever side by settlement and the worst case of single pillar and multiple pillar settlement. The result show that, the internal force variety range and deformation of structure are large greatly in the single pillar and many pillars settlement case which the corner pillar participate, namely the corner pillar settlement disadvantage to the performence of structure; The settlement influence the level displacement smaller and the vertical displacement greatly, and infulence the smooth level of steel truss platformseriously, it will affect the equipments above structure.The textual research helps us to understand influence to structure performence by the asymmetrical settlement, and may accelerate its design domestic product advancement.