Impact coefficient of runway bridge under impact of aircraft landing

Here, to fill in current gaps in study on impact coefficient of aircraft landing runway bridge both domestically and internationally, influencing factors on impact coefficient were explored and a reasonable formula for calculating impact coefficient was proposed. Firstly, a 5-span continuous beam bridge and a civil aircraft Boeing 737-800 at a certain airport were taken as the study objects. Based on Joint Simulation technology of finite element method and multi-body dynamics method, a refined aircraft-bridge coupled Vibration analysis System was established. Then, effects of factors of aircraft landing mass, pitch angle, sinking speed, bridge stiffness and bridge damping on bridge impact coefficient during aircraft landing were studied to reveal their inherent laws and mechanism. Finally, Statistical analysis was performed to clarify distribution features of bridge impact coefficient, and the stepwise linear regression analysis method was selected to further propose the regression model for impact coefficient of continuous beam bridge during aircraft landing. The study results showed that aircraft landing mass, sinking speed, grounding speed, roll angle, bridge stiffness and bridge damping are important factors affecting impact coefficient; when an aircraft lands on a bridge, bridge impact coefficient obeys the extreme value type I distribution, its main distribution interval is 0. 28 -0. 79 and up to 2. 07; the average difference rate between the proposed regression model results and numerical Simulation results for impact coefficient of continuous beam bridge during aircraft landing is 5. 13%, the fitting effect of the regression model is good; the regression model has certain reference value for predicting impact coefficient of runway bridge under impact of aircraft landing. © 2025 Chinese Vibration Engineering Society. All rights reserved.