Method for fast assessment on bearing capacity of bridge based on moving load test

Abstract

The invention relates to a method for fast assessment on bearing capacity of a bridge based on a moving load test. The method is characterized by comprising the steps of 1 determining loaded vehicles and monitoring point arrangement, 2 arranging sensors in a field according to a monitoring point arrangement scheme, 3 driving the vehicles in the field and acquiring dynamic response of the bridge, 4 extracting the dynamic response of a bridge structure, 5 calculating static response and calculating static deflection and static strain according to maximum dynamic deflection, maximum dynamic strain and power increasing coefficient extracted according to a dynamic response curve of the bridge, and 6 assessing the bearing capacity of a tested bridge. The moving load test is conducted on the vehicles under the static load test condition at certain speed, so that acquired dynamic response is converted into static response by utilizing a formula, then the static response is compared with a theoretical calculating value and a relevant specification specified value, and further the bearing capacity of the bridge structure is assessed according to current specifications. The method for fast assessment on the bearing capacity of the bridge based on the moving load test has the advantages of saving time and labor and basically having no influence on traffic.

Description

technical field [0001] The invention belongs to the technical field of bridge detection in bridge engineering, in particular to a method for quickly evaluating the bearing capacity of a bridge based on a moving load test. Background technique [0002] At present, in the field of bridge inspection, the evaluation methods of bridge bearing capacity mainly include static load test method and dynamic load test method. Static load test is a relatively intuitive method to evaluate the bearing capacity of bridges. It mainly applies external loads that are basically equivalent to the design load or service load on the bridge structure, adopts the method of staged loading, and uses testing instruments to test the control of the bridge structure. Changes in deflection, stress, cracks, and lateral distribution coefficients of the parts and control sections under various test loads, and compare the test results with the calculated values ​​of the structure under the corresponding loads ...

AI Technical Summary

Problems solved by technology

However, the static load test is time-consuming, costly and labor-intensive, and the most important thing is that it has a relatively large negative impact on traffic.

[0003] The workload of the dynamic load test is small, the cost is low, the test time is short, and the operation is convenient and fast. However, it is not yet possible to establish a connection between the results of the dynamic load test and the bearing capacity of the bridge, and the data of the dynamic load test cannot be fully utilized.

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