a method for fabricating a turbine casing including a plurality of turbine shroud assemblies is provided . the method includes providing a base casing having a forward mounting flange and an aft mounting flange and at least one channel defined therebetween , machining a rim on the base casing proximate the at least one channel , and coupling a ring member to the base casing with an interference fit such that the rim is at least partially received within a groove formed within the ring member .