Data-driven modeling of bridge buffeting in the time domain using long short-term memory network based on structural health monitoring

摘要

A data-driven approach for modeling bridge buffeting in the time domain is proposed based on the structural health monitoring (SHM) system. The long short-term memory (LSTM) network is applied to model the bridge aerodynamic system with the potential fluid memory effect which is characterized by an uncertain time lag between inflow wind and the structural response. SHM is incorporated into this data-driven approach due to the advantages of prototype measurements such as the ability to consider the high Reynolds number effects and the real natural winds with nonuniformity and nonstationarity. The cell state in the LSTM module is applied to carry the potential fluid memory effects for predicting the aerodynamic response. We compare the obtained data-driven model and the conventional finite element model in the buffeting response prediction. The data-driven model shows higher accuracy than the conventional model, indicating that the proposed data-driven approach has promising potential in modeling bridge aerodynamics. The incorporation of the proposed LSTM-based bridge aerodynamic model and the field monitoring enables us to move buffeting predictions from lab theory to practical engineering.