|主題||Evaluation of Thermal Stresses in Concrete Liquid Storage Tanks|
|筆頭著者||N.D.Vitharana（Reserch Institute, Sapporo）|
|連名者1||K.Sakai（Reserch Institute, Sapporo）|
|連名者2||J.A.Dean（University of Canterbury）|
|連名者3||M.J.N.Priestley（University of Clifornia）|
Concrete liquid storage tanks are used for many purposes particularly in water-supply and waste-water treatment schemes and also as industrial liquid retaining structures. In the past. hydrastatic pressure from the retained liquid was considered to be the dominant loading condition. However, in recent Codes of practice , the designers are required to incorporate thermally induced stresses in the design process.Similar requirements have been introduced in concrete bridge design practices.
The available design aids and recommendations are however limited in this regard. The early deterioration of many concrete liquid storage tanks has been attributed to the lack of guidelines and reconmendations based on rational approaches for the evaluation of thermally induced stresses.
In this paper, the significance of thermal stresses and their evaluation are discussed. A simplified non-linear analysis methodology for the analysis of cylindrical concrete reservoirs subjected to rotationally symmetric loading, is also described.
As shown by a typical example, the use of constant stiffness reduction factors does not represent the actual behaviour of the reservoir wall. Similar analyses for a wide range of reservoirs showed that the differences are inconsistent. While the approach taken by [1,2] to incorporate temperature effects is to be appreciated, there is an urgent need for more research in this area.