Method for dynamically monitoring vertical displacement of building

Abstract

The invention provides a method for dynamically monitoring a vertical displacement of a building. The method comprises the following steps: determining a boundary fd of a low-frequency displacement and a dynamic displacement according to the lowest response frequency of a vertical acceleration sensor, the frequency smaller than or equal to fd as the low-frequency displacement, and the frequency greater than fd as the dynamic displacement; obtaining the displacement of a measurement point relative to a reference point by a liquid pressure difference measured by a liquid pressure sensor, and measuring a static displacement and the low-frequency displacement after low-pass filtering; obtaining a displacement spectrum from the acceleration measured by the acceleration sensor after fourier transform and high-pass filtering according to the relation between the acceleration spectrum and the displacement spectrum; finally obtaining the dynamic displacement by inverse fourier transform; and adding the static displacement, the low-frequency displacement and the dynamic displacement to obtain the vertical displacement. By adopting the method provided by the invention, the static displacement, the low-frequency displacement and the dynamic displacement are respectively measured by adopting two different methods; an error is effectively reduced; meanwhile, the method is fewer in demands on the field, wide in application range and convenient to use.

Description

technical field [0001] The invention relates to the field of structural safety monitoring, in particular to a method for dynamically monitoring the vertical displacement of a building. Background technique [0002] Dynamic monitoring of vertical displacement of long-span building structures is one of the important contents of structural safety monitoring. like figure 1 For the large-span building structure shown, if several points A of the structure can be measured in real time 1 、A 2 ,...A i ...A n The vertical displacement of the structure can be deduced to infer the stress state of the structure, and then judge whether the structure is safe. [0003] To monitor A i The vertical displacement of the point can be measured A i The distance from the point to the bottom. Since the vertical displacement of the bottom surface is negligible, A i The change in distance from the point to the ground reflects the A i The vertical displacement of the point. However, for actu...

AI Technical Summary

Problems solved by technology

However, for actual buildings, such as indoor gymnasiums or exhibition halls, when the bottom surface is used as a reference point, it must be ensured that the bottom surface is not in use, which affects the use of the building and fails to achieve the purpose of dynamically monitoring the vertical displacement of the building , so this method requires high conditions, has certain limitations, has a small scope of application and is more complicated to use

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