Exact Method in Design of Circular Base Plate under Large Eccentric Loads

Circular base plates are commonly used for pipe columns, such as pylons in cabled-stayed bridges, lighting poles and electric power line posts. Against rectangular base plates, an exact method has not been presented about design of circular base plates in the classified and well-documented form. Therefore, this paper by expression of mathematic formulas describes on exact method to design these plates which use of this method requires an iteration approach to solve the equilibrium moment equation. Then it compares by presented graphs obtained designing results from exact and existing method [1], in return for different design parameters and demonstrates safe limits to use of approximate method. The results show that approximate method commonly will not be safe and can demonstrate reasonable results under specified conditions. Whereas exact method has been presented in this paper is safe and replies reasonably under any conditions.