Rapid testing method of structural dynamic characteristics using artificial vibration

Abstract

The invention relates to a rapid test method for the structural dynamic characteristics by artificial excitation. The rapid test method comprises the steps that S1, a wearable sensor and a force plateare used for establishing a measured human-induced load database; S2, measured human-induced load ground reaction force and human characteristic point motion acceleration are normalized and then compared to obtain a human motion characteristic point acceleration-ground reaction force relation; S3, power excitation is performed on a structure to be tested by motions such as human jump and swing, and the characteristic point acceleration during the human motion and a response time history of the structure in the corresponding direction are synchronously measured; S4, the relation sought in theS2 is used for reconstructing an excitation time history of the artificial excitation; and S5, according to the structural excitation and response measured in the above steps, the modal testing technology is used for obtaining the dynamic characteristics such as the natural vibration frequency, the damping ratio and the modal mass of the structure. The rapid test method can perform excitation in various directions for a plurality of different structural forms and perform rapid dynamic testing, and the test results are high in reliability.

Description

technical field [0001] The invention relates to the technical field of building structures, which can be used for structural detection, health monitoring and vibration control of existing buildings, and in particular relates to a rapid testing method for structural dynamic characteristics using artificial excitation. Background technique [0002] With the development of the construction industry and the wide application of lightweight and high-strength materials, more and more new building structures have been realized. These new structures usually have the characteristics of large structural span, light weight, small damping ratio and stiffness. It is easy to produce more obvious vibration under the action of people's walking, jumping and other activities. With the improvement of people's living standards, the requirements for working and living conditions are also increasing, and the vibration comfort of building structures is becoming increasingly difficult to ignore. ...

AI Technical Summary

Problems solved by technology

However, the application of artificial excitation has always regarded the human body as a "sandbag" that can move by itself, without giving full play to the advantages of human intelligence. The human body is an intelligent device that integrates energy supply, sound and light signal reception and processing, and power output. The system is an ideal low-frequency "artificial vibration source". The structural comfort and safety accidents caused by human-induced loads in the past have also proved the potential of artificial vibration from the side.

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