Method for rapidly detecting medium and small bridge on basis of block impact vibration test

Abstract

The invention discloses a method for rapidly detecting a medium and small bridge on the basis of a block impact vibration test, which comprises the following steps of: dividing a whole bridge floor into a plurality of subblock regions according to a bridge shape, wherein a connection point is formed between each two subblock regions; carrying out the impact vibration test on each subblock and measuring data of each connection point between each two subblock regions; and utilizing a powersignal analyzing method to fuse test data of each connection point and test data of each subblock so as to recognize a whole structure characteristic. According to the method disclosed by the invention, a few sensors are adopted to carry out the block impact vibration test on the bridge, and the powersignal analyzing method is utilized to fuse vibration data of the subblocks and recognize a frequency domain transfer function and a modal parameter of the whole structure. Particularly, according to the method disclosed by the invention, the test data of each subblock can be utilized to recognize the flexibility matrix of the whole structure, so that the deformation of the bridge under any load can be forecasted, and the safe condition of the structure can be effectively estimated.

Description

technical field [0001] The invention relates to a block impact vibration test method for small and medium bridges, which can realize deformation prediction and rapid safety assessment of small and medium bridges. Background technique [0002] The performance of civil engineering structures such as houses and bridges gradually degrades under the natural environment and daily loads, and they may be attacked by strong natural disasters such as earthquakes and typhoons at any time. Therefore, regular or even real-time health monitoring and diagnosis of civil engineering structures can effectively reduce the possibility of collapse of engineering structures, avoid sudden disasters, and ensure the safety of people and national property. Data observed using vibration testing can be used to identify structural parameters for structural health diagnosis. In recent years, structural health monitoring and diagnosis technology based on vibration testing has been gradually applied to ci...

AI Technical Summary

Problems solved by technology

However, in the traditional shock vibration test, it is required to arrange the sensors on the entire bridge deck, so the number of sensors required is large, the cables for data transmission are long, the equipment installation requires a lot of manpower and material resources, and the bridge closes for a long time

Images