Damage location method of bridge structure based on temporal and spatial evolution of index frequency

Abstract

The invention provides a bridge structure damage positioning method based on indicated frequency space-time evolution, wherein the method includes following steps: (a) collecting data at various spatial position test points in a bridge structure, wherein the test points form a spatial lattice; (b) collecting vibration frequency data of various spatial position test points in the bridge structure; c) performing damage positioning to the bridge structure according to the change rules of the vibration frequency of different spatial position test points within a time domain. According to the bridge structure damage positioning method based on the indicated frequency space-time evolution, travelling vehicles, which runs on the bridge structure, are employed as a power excitation source, so that the method is free of manual excitation and is free of interference on normal traffic, thereby saving economic and time cost. The hardware in the method can be changed at any time and is suitable for bridges in different types. By means of bridge structure acceleration response, the method is high in data quality, is stable and reliable, is low in test cost and is suitable for being popularized in large area.

Description

technical field [0001] The invention relates to the field of bridge detection, in particular to a bridge structure damage location method based on the temporal and spatial evolution of indicator frequencies. Background technique [0002] With the rapid development of my country's transportation industry, bridge construction, as an important part of transportation, has been widely used in highway and railway construction. However, during the construction and use of bridges, cracks are prone to occur. The appearance of cracks not only affects the quality of the project, but even leads to the collapse of the bridge. Therefore, how to locate and identify damage forms such as bridge structural cracks is of great practical significance. There are many detection methods in the existing technology, such as ultrasonic method, optical fiber sensor method, structural mode shape method, bionic smart network method and Technology such as camera / scanning identification method. These te...

AI Technical Summary

Problems solved by technology

These technologies have their own characteristics, but most of the above-mentioned technologies have defects such as high application cost, low accuracy and reliability, and poor adaptability to complex bridge structures. The time-spatial evolution law of point indicator frequency under different structural damage states in the time domain to realize the technology of damage location

Images