A Simplified Approach for Predicting Bridge Pier Responses Subjected to Barge Impact Loading

摘要

Bridge piers are often designed to resist barge impact loads according to empirical equations given in various design codes based primarily on equivalent static analyses. Although these analyses can give useful guidance in design practice, they neglect dynamic effects which can have significant influence on barge-bridge structure interactions. It is necessary to develop an efficient and accurate method that takes into consideration of dynamic effect, material nonlinearity and structural damage in predicting impact loads and structural responses. In this study, empirical equations based on intensive numerical simulation results proposed in a previous study are used to estimate dynamic impact loads on bridge piers. The bridge structure is simplified as a nonlinear single degree of freedom system to calculate its dynamic response. As compared to detailed finite element simulation, this simplified approach is straightforward and gives reasonably accurate prediction of bridge responses. It can be used in the preliminary analysis and design of bridge structures against barge impact.