In order to investigate the actual bearing capacity of a top-bearing box arch bridge with an evaluation scale of category 4,the actual stress condition of the bridge is determined to provide a scientific basis for the later reinforcement research and monitoring.The field load test combined with finite element analysis is used to obtain the measured and theoretical values,and the static and dynamic load test measures the deflection,strain and self-oscillation characteristics,impact coefficient and other parameters,and then introduces the static load test efficiency and checking coefficients and other parameters to determine whether the structural characteristics still satisfy the requirements of the loading of Highway Ⅰ.The results show that:The deflection calibration coefficient and strain calibration coefficient of some conditions do not meet the requirements of 0.50<η≤1.00 and 0.50<η<0.90 in the specification,but they all meet the requirements of not greater than 1,indicating that the structural stiffness is still rich;And the relative residual deflection and relative residual strain are both within 20.0%,indicating that the structure is still in the elastic range;The pulsation test,running car and jumping car test show that the overall stiffness of the structure is better than the theory,the traveling smoothness and good dynamic performance.
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