Finite element simulations of seismic response of precast concrete segmental columns

For accelerated bridge construction, substructures are critical path elements of the schedule in many cases. In order to accelerate the construction of substructures, in particular, piers, precast concrete segmental columns (PCSC) has been used for a number of projects. However, their application in strong seismic regions is very limited because of lack of experience and knowledge. Recently, several analytical and experimental studies investigated the possibilities and the problems of PCSCs. It has been observed that the interface between segments experience opening-closing under cyclic loadings, which prevent the formation of plastic hinges at the intended bottom/top of the column. In this present study, a finite element analysis scheme is developed for analyses of PCSCs. The modeling requires accurate and robust characterization of concrete material, reinforcing steel, post-tensioning tendons, and segmental interfaces. Finite element analysis pushover results compared well with available experimental results. The finite element analysis scheme was extended to determine seismic characteristics of the system. Furthermore, seismic response of the structures subjected to earthquake ground motions is to be investigated based on nonlinear dynamic time-history analysis.