The analysis of impact coefficient on reinforced-concrete bridge

In order to discuss the displacement impact coefficient of the simply supported beam bridge, reinforced-concrete simply supported beam models with different span and different section stiffness are set up using the finite element method in the paper. The maximum dynamic displacement of beam models under the running vehicle is calculated. Combined with the maximum static displacement, the corresponding impact coefficients of models are calculated. At the same time, the modal analysis of beams is conducted to calculate the impact coefficient based on the base frequency. From comparing with the displacement impact coefficient, the bridge spans and section stiffuess influence on impact coefficient is analyzed. Results show that the influence of section stiffness on impact coefficient can be ignored, but the influence of the change of span cannot be ignored. It will provide a reference for designing and detection technology of reinforced-concrete simply supported beam.