Wind Vibration Coefficient Calculation and Wind-induced Response Analysis of Tall Chimney Considering SSI Effect
To study the effect of Soil-structure Interaction(SSI)on the structure of tall chimneys under wind load.In this paper,the chimney finite element model with and without SSI effect is established by ABAQUS,and the structural dynamic characteristics of the models under two working conditions are analyzed,and the chimney wind vibration coefficient under two working conditions is calculated according to the specification.Through the dynamic time history analysis of the structure,the concrete influences of different stiffness of foundation soil on the chimney structure are compared.The results show that the natural vibration period of chimney increases after SSI effect is taken into account.The higher the height is,the greater the deviation between the wind vibration coefficient of the chimney considering SSI effect and the wind vibration coefficient of the rigid foundation is.Considering SSI effect can calculate the wind vibration coefficient more accurately in the structural design.The smaller the foundation soil stiffness is,the greater the displacement and acceleration response of the chimney superstructure is.The SSI effect on the tall chimney structure should be considered in the structural design on soft soil foundation.
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