Research On The Influence Of Several Variables On Seismic Performance Of Air Cooling Structure System

At present,the air-cooling system of large-scale thermal power plants is mainly a steel truss-group-column structure system.The structural stability of the air-cooling system is related to the normal operation of thermal power plants.This paper uses finite element software ABAQUS to establish a standard parameter model based on actual working conditions,analyzes the internal force and displacement of the structure under earthquake action,and then establishes a comparison model.By changing the relevant geometric and mechanical parameters of load-bearing column and foundation soil in the model and comparing the data differences of internal force and displacement between the model and the standard model under the common action of air cooling system,the influence degree of different concrete column and soil characteristics on the structure under the common action is obtained,which provides basic research results and reference design suggestions for the design and research of air cooling system.The following research has been carried out in this paper:(1)Reading,studying and sorting out a large number of documents,first mastering the mechanism of joint action,and analyzing the characteristics of steel truss structure,including air cooling system.According to the size of the structure’s own anti-lateral and anti-torsion capabilities,the effect of concrete column parameters,concrete column depth and soil.parameters on th e structure’s anti-lateral stiffness and anti-torsion stiffness under the joint action of structure,foundation and foundation is proposed.(2)The static distribution of the standard model is described.The main static forces are dead weight of structures and equipment,live load,snow load and wind load.Modal analysis of the standard model shows that the Y-direction anti-lateral stiffness of the structure is relatively weak and the anti-torsion effect of the structure is relatively good.Changing the cross-sectional parameters of the support column and changing the elastic modulus of the soil can strengthen the anti-torsion effect of the structure,while changing the buried depth of the support column can weaken the anti-torsion effect of the structure and exceed the upper limit of the ratio of the first-order torsion period to the first-order translational period stipulated in the Code for Seismic Design of Buildings.(3)Carry out linear time-history analysis under three kinds of seismic waves of the standard model,and carry out linear time-history analysis under EL-Centro seismic waves for the comparison model group.Under the influence of seismic waves,the changes of the inner diameter of the concrete pipe column and the elastic modulus of the soil increase the overall stiffness of the structure,enhance the destructive capability against seismic action,move up the initial displacement point of the load-bearing column,reduce the disturbance effect of uneven deformation on the soil under the dynamic action of the structure,and have obvious influence on the structural stiffness,while the buried depth of the pipe column has little influence on the structural stiffness,and has relatively limited anti-seismic optimization effect on the structure.(4)Non-linear time-history analysis is carried out for the standard model and the comparison group model respectively.Under the influence of stronger seismic waves,the displacement peak and velocity peak seismic waves of the standard model increase by 53%,and the structure rapidly enters a plastic state.Under the influence of stronger seismic waves,the change of the cross-sectional parameters of the support column will delay the time when the structure enters a plastic strain,reduce the horizontal displacement,reduce the damage degree,enhance the protection of the displacement of the column top by 18.4%,and enhance the protection of the displacement of the pile top by 43.7%;The change of the buried depth of the supporting column will aggravate the damage of the structure,an d the damage degree will be enlarged Iby 7%,but the pile body will be protected,and the damage degree will be reduced by 13.1%.