Comparative Study of confinement requirement of concrete Bridge pier using IRC, IS1893: part-3(draft) and CALTRANs Guidline
Narmada Water Resource Water Supply and Kalpsar Department, Government of Gujarat, India
ABSTRACT
Failures of the bridge piers in the past major earthquakes attracted attention towards prevalent seismic design practices for bridge piers. The present study compared design provision of RC bridge piers given in Indian and International codes of concrete member. Bridge pier confinement provision in Plastic hinge zone obtained using International code such as Caltrans (USA), was compared with those obtained using Indian codes. Seismic design scenario was considered, which reflects the differences in the RC design provisions among Indian codes, namely IS 1893 Part-3 (Draft), and IRC 21: 2000, and Caltrans (USA). From analysis of a number of pier, transverse reinforcement requirements are found to be inadequate for specific drift demand; shear capacities of section are found to be lower than the shear demand due to flexure. Increasing transverse reinforcement increase the deformability and ductility of the pier. Increase in the level of axial load reduces the ductility but increase the shear demand on the section.
