A correction method for interstory displacement based on monitoring displacement and cut-off frequency

Abstract

The invention discloses a monitoring displacement and cutoff frequency-based inter-storey displacement correcting method. The monitoring displacement and cutoff frequency-based inter-storey displacement correcting method comprises acquiring the acceleration data of every monitored storey, the inter-storey displacement data of one of the monitored storeys and a corresponding measured displacement time-travel curve; acquiring and preprocessing inter-storey acceleration data; performing discrete Fourier transformation, frequency domain integration and inverse Fourier transformation on the acceleration data of a storey with measured displacement to acquire an integrating speed time travel curve and an integrating displacement time travel curve; inputting different cutoff frequencies and performing calculation to determine the cut-off frequency corresponding to minimum errors of the integrating displacement time travel curve and the measured displacement time travel curve; applying the determined cutoff frequency to acceleration integration corresponding to other storeys to be monitored, and performing frequency domain integration to acquire all inter-storey displacements. The monitoring displacement and cutoff frequency-based inter-storey displacement correcting method can effectively avoid difficulty in direct inter-storey displacement monitoring, saves complex calculation procedures of error reduction in existing integration manners and further improves integration precision.

Description

technical field [0001] The invention belongs to the field of safety monitoring of civil engineering structures and relates to a method for correcting interstory displacement of high-rise structures under extreme loads. More precisely, the present invention relates to a method capable of correcting the integral displacement of the acceleration data of other floors by comparing the monitoring displacement data of one floor with the acceleration integral displacement under the action of earthquake excitation of a high-rise structure. Background technique [0002] Under the action of earthquake load, the high-rise building structure is the most important type of housing that affects the safety of human life. Damaged and completely collapsed, seriously endangering human life. Therefore, the safety assessment of structures under aftershocks is of great significance for reducing casualties and property losses. [0003] Acceleration sensors are widely used in seismic monitoring of...

AI Technical Summary

Problems solved by technology

However, displacement is very difficult in actual monitoring. The traditional monitoring methods mainly include the following: one is to use displacement sensors such as linear variable differential transformers, such as laser displacement sensors, but they need a fixed reference in actual operation. Usually, the scaffolding is fixed on the ground to install the laser displacement sensor. This method is costly and complicated to operate, and the scaffolding and the structure will vibrate greatly under the action of the earthquake.

The resulting relative displacement is not accurate

The second is to use GPS for fixed-point monitoring. Although it is easy to operate, it is expensive, the accuracy is not high, and the sampling frequency is difficult to meet the requirements of monitoring vibration displacement, which is not an ideal monitoring method for measuring interlayer displacement.

But in the actual situation, the initial displacement and initial velocity are unknown, which leads to the existence of trend term and integral error

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