Analiza korelacyjna drgań losowych mostu wantowego obciążonego porywistym wiatrem

The paper concerns stochastic analysis of cable-stayed bridge response due to the dynamic action of gusty wind. Non-stationary wind model with time dependent periodic mean speed is presented for investigating the buffeting bridge response amplified in resonant regime. Equation of motion is formulated by substructure technique. Buffeting forces are derived under the assumption that their span-wise correlation is the same as that of incoming wind fluctuations. The bridge response is obtained neglecting structure nonlinearities, as a sum of component responses due to buffeting forces acting on scattered deck sections. Mean junction and variance of bridge response are obtained. Two approximate formulas of variance are derived by using two mathematical models of wind turbulence correlations. The outline of numerical application is presented.