Research On Design And Technology Of The Prestressed Concrete Coal Storage Silo

The silo is used to store bulk materials, it is characterized by large volume, the small size of land occupied,low-cost, and environmental protection.With the development of coal-fired power plants, the giant coal storage silo, whose diameter is greater than100meters, is applied more widely. Through research and analysis, we found that most of the giant coal storage silos are reinforced concrete structure in our country.A major drawback of the reinforced concrete silos is that it can not take the initiative to stop generating crack and control crack width.Therefore, we consider to overcome the weaknesses of the reinforced concrete silos by applying press to the silos.Based on a actual project of giant coal storage silo,the author principally carry out a research as following,by means of studing a large amount of books and information:(1) According to the actual project, a finite element model is established by using the finite element software ANSYS. The mechanical properties of reinforced concrete silos in case of storage material load and inside and outside differences in temperature for giant reinforced concrete silo, have been carried out.(2) With the application of theoretical knowledge of the unbonded prestressed technology, we established a trapezoidal cross-section prestressed concrete silo model,which was the same with reinforced concrete silo in wall section size.Then we used the finite element software ANSYS to analyse.(3) Under the conditions to meet the structural requirements of the prestressed concrete silo,we analysed four prestressed concrete silos, their thickness values are600mm,700mm,800mm and900mm. Aferward,each solution result is respectively analyzed and compared.We selected the optimal cross-section of the prestressed concrete silos in accordance with the requirements of a crack control.(4) A comparative analysis of the reinforced concrete silo and the prestressed concrete silo with optimal cross-section in the economy.The results show that:The reinforced concrete silo wall mainly bears hoop tension in case of storage material load and inside and outside differences in temperature;Under the conditions to meet the structural requirements,800mm is the optimum wall thickness value for the giant prestressed concrete silo.The cross-section not only satisfies the requirements of crack control, but also saves the amount of concrete; Unbonded prestressed technology can indeed be better to improve the silo structure performance and in the economy is also superior to the reinforced concrete silos.