Effect of Moving Loads Speed on Dynamic Response of Bridge at the Center of Span

A simply supported beam bridge model with time-varying moving load on is established.The effect of moving load speed is considered.The vibration equation in a matrix form is presented.Adopting the powerful MATLAB code,a re-developed function based on ODE solver is programmed for analysis of dynamical response problems of the time-varying systems,such as vehicle-bridge coupling vibration problems.Analytical results show that as the maximal deflection occurs,moving load does not always locate at mid-span but varies regularly with moving load speed.As the moving load speed increases,the maximal deflection at the mid-span increases fluctuantly.And the fluctuation period and amplitude increase regularly.