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A NEW APPROACH TO MODELLING ROCKING MOTION OF POST-TENSIONED SEGMENTAL COLUMNS

. Application of post-tensioned segmental columns are increasing in accelerated bridge construction, where rocking motion of the segments results in lateral displacement of the column and the post-tensioning tendon provides self-centering capacity of the system. Analytical solution of such system is very complex as the equations of rocking motion are highly nonlinear, and it is almost impossible to solve such systems for seismic excitations. Further-more, using finite element-based software such as ABAQUS and ANSYS make the dynamic analysis very time consuming and, so computationally inefficient. Therefore, this paper intro-duces a new technique for modelling of post-tensioned segmental columns in OpenSees program, which is computationally efficient, and exhibits a good agreement with analytical approaches and experimental results. Using the developed model, the frequency response function and seismic response of an exemplary column are extracted which exhibits a lower and an upper branch around the resonance.