Numerical simulation on wind-induced response of membrane structure of the Expo Axis

With the wind speed time history as the wind tunnel boundary conditions,the wind load time history on membrane structure of the Expo Axis was obtained by using unsteady state calculation.The precision of the unsteady state simulation was verified by comparison of the mean wind pressure using steady state calculation and the statistical average of the wind load time history.Analytical results indicate that the unsteady state simulation can take the spatial distribution of the fluctuating wind load into account.The wind loads from CFD simulation are directly acted on the FEM nodes to calculate the dynamic responses in time domain.The results show that the method can take spatial-temporal correlation of wind and higher modes influence into account.Therefore,wind-induced vibration can be described more accurately.