In-service bridge bearing capacity evaluation method without resistance information

Abstract

The invention discloses an in-service bridge bearing capacity evaluation method without resistance information. The method comprises the following steps: firstly, carrying out necessary investigation and detection to correctly estimate a possible automobile load grade of a bridge, establishing a finite element model to calculate standard values of a dead load effect and an automobile load effect, and further obtaining corresponding statistical parameters and a probability density function to establish a structure failure probability formula; a test load effect value meeting the target reliability index is inversely calculated through a failure probability formula, after the test working condition is implemented, the automobile load grade meeting the bearing capacity is directly evaluated according to the test result, and structural check calculation is not needed. According to the method, resistance information and check calculation are not needed, a field implementation program is basically the same as a load test, the cost is equivalent, the method has the advantages of simplicity, high efficiency and reliable result, the target reliability index and the continuous service life corresponding to the bearing capacity can be adjusted, different management and maintenance requirements are met, and the method has very high practicability and very high popularization value.

Description

technical field [0001] The invention belongs to the field of bridge bearing capacity evaluation, in particular to a method for evaluating the bearing capacity of in-service bridges without resistance information. Background technique [0002] The bearing capacity of a bridge is measured by the probability of the bridge achieving structural safety, applicability and durability under normal design, normal construction and normal use conditions within the design reference period, that is, when the reliability probability is greater than the target probability, the bearing capacity meet the requirements, otherwise not. At present, there are mainly two methods for evaluating the bearing capacity of in-service bridges, including checking calculation evaluation method and load test evaluation method. [0003] The "checking and evaluation method" is based on the checking method stipulated in the "Highway Bridge Bearing Capacity Testing and Evaluation Regulations" (JTG / T J21-2011). ...

AI Technical Summary

Problems solved by technology

Based on the theory of structural reliability, this method does not need to obtain the distribution of resistance, and does not need to check and calculate the bearing capacity. It can directly evaluate the bearing capacity of the bridge directly according to the results of the static load test. The evaluation of the carrying capacity of bridges in service has successfully solved the problem that there is no effective method for evaluation of such bridges

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