Study on inelastic design of composite continuous girders considering moment redistribution

Abstract

Performance based design has been thought to be rational because it enables engineers to use variety of design and construction methods for each structure. Inelastic design considering moment redistribution is one of such design methods, and has currently been included in design specification in the United State. In this paper, the mechanism of moment redistribution is illustrated, and a design example using inelastic design procedure is presented to demonstrate how the moment redistribution is included in the design. In addition, a simple equation to calculate the inelastic rotation at the intermediate support in a two-span continuous girder due to factored load and a procedure to check the safety of rotational capacity of the section are proposed.