Impact of pier length and connection type in static and dynamic response of RC bridge structure

Abstract

In this paper are presented analysis results of two bridges with similar geometry. The difference between them is in the length of piers. 3D (three-dimensional) mathematical model composed of RC piers (substructure) absolutely fixed at the base and RC deck (superstructure) are developed. Both bridges are analyzed as Bridge Type 1 (with hinge connection between superstructure and substructure) and Bridge Type 2 (with fixed connection between superstructure and substructure). Superstructure is the same for both bridges. Three analyses types are performed for both bridges: - Static analysis including computation of displacements and element forces due to specified static loads. - Analyses of structural dynamic characteristics including mode shapes and corresponding free-vibration periods. - Dynamic response analyses under real earthquake ground excitation specified by corresponding input acceleration history. Comparative analysis results of static and dynamic response for each Bridge Type, considering different connection between piers and superstructure are presented.