TEMPERATURE EFFECT ON VIBRATION CHARACTERISITICS OF STEEL TRUSS BRIDGE UNDER SOLAR RADIATION

Abstract

To investigate the influence of temperature on the bridge's response, a 40-hour real-time monitoring was conducted on a steel truss bridge. Analysis of the measured results indicated that the bridge's temperature is positively correlated with its natural frequency, which contrasts with the results from the finite element model. By adjusting the boundary conditions of the FE model to better reflect the actual conditions at the bridge's ends, the modified results aligned with the measured data. The results suggest that temperature variations induce changes in the internal stress distribution, which negatively impact the natural frequency. However, the boundary conditions introduce additional stiffness at the beam ends due to temperature effects, resulting in an overall increase in natural frequency with rising temperature.