Steel roof truss damage diagnosis method

Abstract

The invention discloses a steel roof truss damage diagnosis method, which comprises the following steps: 1, optionally selecting a node in a steel roof truss and mounting a detachable additional mass block at the node; 2, measuring the low-order inherent frequency of the vibration of the steel roof truss by using a dynamic data acquisition system after the additional mass block is arranged at the node; 3, detaching the additional mass block, selecting another node of the steel roof truss, mounting the additional mass block at the node, and measuring the low-order inherent frequency of the vibration of the steel roof truss after the additional mass block is arranged at the new position; 4, repeating the process; and 5, inputting the measured frequency information into a compiled steel roof truss damage diagnosis program to obtain a diagnosis result of the steel roof truss damage condition. The steel roof truss damage diagnosis method has the advantages that the operation is convenient, the additional mass block can be repeatedly used, equipment is easy to implement, the cost is low, the normal work of the steel roof truss is not affected and the like, sufficient frequency information can be acquired to meet the requirement for damage diagnosis, and the damage diagnosis is accurate and reliable.

Description

technical field [0001] The invention belongs to the field of structural damage diagnosis in the discipline of civil engineering, and relates to a damage diagnosis method for a steel roof truss. Background technique [0002] Steel roof trusses are widely used in many industrial and civil buildings. Due to the increase of service life and the influence of environmental corrosion and disaster loads, the collapse of steel roof trusses has occurred from time to time, and it is urgent to make a timely diagnosis of its damage status in order to facilitate maintenance and reinforcement to avoid catastrophic consequences. [0003] The traditional damage diagnosis methods are mostly visual local experimental methods, such as ultrasonic method, magnetic field method, temperature field method, etc. These methods generally require that the damage location be known in advance and the equipment to be detected can be reached, so the workload is high and the cost is high, and it is not suit...

AI Technical Summary

Problems solved by technology

However, in the existing technology of engineering practice, only a few low-order frequency parameters can be collected, which cannot meet the needs of damage diagnosis of steel roof truss structures in many cases.

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