Evaluation of Limit State for Pier According to Scour and Peak Ground Acceleration

Abstract

Recently, materials and structure analysis techniques used in various structures have been developed and have made remarkable progress. As the design method for reinforced concrete structures is shifting to the limit state design method, it is necessary to conduct the limit state assessment. So far, several researchers have evaluated the safety of many structures covered by the civil engineering field by introducing the limit state assessment. However, there is a lack of research on bridge piers considering the level of scour. Therefore, in this study, T-shaped bridge piers with a height of 11.5 m and a width of 2.8 m installed in underwater ground were selected and the critical condition of bridge pier for 20 seismic waves was evaluated using LS-DYNA. The presence or absence of scouring was also set as a variable and the level of scour is changed from 0 to 5 meter. As a result of the analysis, the main fracture was tensile failure at the maximum ground acceleration of 0.2g to 0.4g, and the maximum ground acceleration after the earthquake was found to be weak as a whole except compression. Finally, as a result of comparing analysis results according to the presence or absence of scour, the limit state reaching ratio showed a similar pattern without significant change.