Method and system for space roof truss damage detection

Abstract

The invention relates to a method and a system for space roof truss damage detection. The method comprises the steps that a laser transmitter and a laser receiver are fixedly installed; the laser transmitter transmits to a target node; the laser receiver receives reflected light from the target node; according to the reflected light, vibration information of the target node is acquired; it is judged whether the number of the collected vibration information achieves the preset requirement, if yes, a next step is continued, if no, collecting is continued; according to low order natural mode of vibration of space roof truss vibration, a damage parameter of each unit of the space roof truss is calculated and obtained. According to the method and the system for space roof truss damage detection, by installing a dynamic data acquisition system, topological structure of a structure model can not be changed, by changing the position of the dynamic data acquisition system, enough vibration information can be obtained conveniently to satisfy the needs of damage detection, the defect of insufficient vibration information in an existing method is overcome, and the degree of accuracy of the detection is higher.

Description

technical field [0001] The present invention relates to the technical field of structural detection, in particular to the technical field of structural damage detection, in particular to a method and system for detecting damage to space roof trusses. Background technique [0002] Space truss structures are widely used in many industrial and civil buildings, such as tower cranes, transmission towers, space truss bridges, etc. Due to the increase in service life and the influence of environmental corrosion and disaster loads, the space roof truss structure will inevitably be damaged. It is necessary to make timely and accurate detection of the damage in the structure in order to facilitate maintenance and reinforcement to avoid catastrophic consequences. [0003] Most of the traditional damage mode detectors or devices use visible local experimental methods, such as ultrasonic methods, magnetic field methods, temperature field methods, and various devices using these methods. ...

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Problems solved by technology

However, the above method or device has the following defects: First, it is required to know the location of the damage in advance; second, it is required that the equipment at the detected part can reach

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