Structure Design And Wind Load Characteristics Of Prestressed Ovate Structure

Because of the superiority in the technology,structure and energy conservation,prestressed ovate digesting pool is becoming the developmental direction of environmental protection and sewerage treatment. According to the practical project,the paper studies some aspect of structure design and wind characteristics on this structure type.In the aspect of the structure design,the paper uses the analysis method to analyse the membrane inner force and bending effect, and uses the result of the finite element method to compare with it,then gives out the handy formula of inner force;the paper uses the membrane inner force formula to do the shape optimization and works out the linear formula of wall thickness related to the height;uses the handy formula of inner force to deduce the formula of distribution of the prestressed steel bar; analyses the prestressing loss of the move-anchor binderless prestressing steel bar and the the fixed-end binderless prestressing steel bar,then uses the result to calculate the equivalent load of every position;uses two different element styles(shell and solid element) to build the finite element model of the project,and uses these model to analyse the stress distribution of the structure with the work conditions below:water load, gravity load,air pressure,temperature load, and the action of prestressing steel bar,then analyses the combined work conditions of the step of pulling prestressing bar,the phase of normal use,and the most disadvantage phase.In the aspect of the wind characteristic,the paper uses the CFD method to calculate the distibution of the wind pressure coefficient and wind shape coefficient on single body,and workes out the wind following resistence force and the total lifting force;also substitutes the pressure result of CFD method into the finite element method to analyse the stress and work out the distribution of the Mises equivalent stress for finding out the dangerous cross-section.The paper mostly workes on the theoretical analysis,in order to supply some important information for the practical project.