Bridge bearing capacity lightweight evaluation method based on impact load

Abstract

The invention discloses a bridge bearing capacity lightweight evaluation method based on impact load. Themethod comprises steps of loading the bridge by using a drop hammer simulation impact load, measuring a displacement time-history curve and an acceleration time-history curve of a bridge control section by using a displacement sensor and an acceleration sensor, performing comparative analysis on the extracted dynamic response and a theoretical calculation value, and establishing an evaluation index to evaluate the bearing capacity of the bridge. According to the method, the defects of longperiod, high cost and large influence on traffic in the conventional load test evaluation of the bridge bearing capacity are overcome, the evaluation uncertainty caused by the randomness of evaluationindexes and the fuzziness of the method is overcome in the evaluation method, and the method has the advantages of convenience, rapidness, large collected data volume, convenience and accuracy in evaluation and the like.

Description

technical field [0001] The invention relates to the technical field of bridge detection and testing in bridge engineering, in particular to a lightweight evaluation method for bridge bearing capacity based on impact loads. Background technique [0002] The bridge load test is to conduct a bridge load test on bridges with serious damage and poor structural materials after the inspection of the appearance of the bridge and the inspection of structural materials. Its purpose is to test the actual response of the bridge under the most unfavorable load by directly loading the bridge according to the design load, so as to further analyze and understand the working state of the bridge, so as to judge the actual bearing capacity of the bridge structure. Through the dynamic load test, the dynamic characteristic parameters of the bridge structure and the forced vibration response under the action of the dynamic load can be determined, and the dynamic effect and service conditions of t...

AI Technical Summary

Problems solved by technology

[0003] There are problems in the bridge load test: 1. Usually, especially when carrying out the load test on the existing bridge, the traffic needs to be interrupted for a long time, which has a great impact on the normal operation of the traffic; 2. During the load test, There are relatively prominent safety risks, such as improper implementation of on-site safety work arrangements, which may easily lead to traffic safety accidents, especially when conducting tests on expressways and urban arterial roads; If there is a problem with the measurement, it will lead to the deterioration of the bridge disease and damage, and even serious accidents such as bridge collapse

4. Load test items are time-consuming and labor-intensive, and cost a lot of manpower and material resources. When making decisions, the necessity and feasibility of implementing load tests should be comprehensively and objectively analyzed

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