Research on load test of long-span continuous rigid frame bridge with high piers
To investigate the dynamic and static load characteristics of a high-pier long-span continuous rigid frame bridge under normal operational conditions and the most unfavorable stress states,dynamic and static load field tests were conducted based on the bridge load test method.These tests considered various vehicle positions and speeds.The testing encompassed two primary scenarios:positive load and partial load.In the static load tests,the strain and deflection of the main beam under these two conditions were measured.Dynamic load tests assessed the bridge's impact coefficient,natural frequency,and dynamic strain through barrier-free driving and braking tests at speeds of 20,30,and 40 km/h.Upon collecting and processing the field data,a comparative analysis was performed against theoretical calculations obtained from finite element software.The results indicate that the measured deflection and strain values of the continuous rigid frame bridge are lower than the theoretical values under both positive and partial load conditions.The maximum relative residual strain is found to be 18.8%,and the maximum relative residual deflection is 11.71%,both of which are below 20%.Furthermore,the measured vertical vibration frequencies of the first,second,and third mode of the main bridge exceed the theoretical values.Overall,the bearing capacity of the continuous rigid frame bridge meets the required standards.
continuous rigid frame bridgedynamic and static load testcarrying capacityimpact coefficientnatural frequency
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