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Earthquake motion rocking component acquisition method

An acquisition method and technology of ground motion, which is applied to the acquisition of ground motion swing components by spectral ratio method and elastic wave theory. , to achieve the effect of effectively obtaining

Active Publication Date: 2019-04-26
WUHAN UNIV OF TECH
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Problems solved by technology

The ground motion sway component obtained by the improved spectral ratio method only contains low-frequency components, but lacks high-frequency components, and there is a problem that the threshold value is not easy to determine
The method based on the elastic wave theory has the problem that the proportional relationship between the displacement potential functions of the P wave and the SV wave is difficult to determine

Method used

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  • Earthquake motion rocking component acquisition method
  • Earthquake motion rocking component acquisition method
  • Earthquake motion rocking component acquisition method

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Embodiment Construction

[0045] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0046]This embodiment takes the uncorrected seismic wave data recorded by the single pendulum seismograph at the Northridge seismic station in 1994 (this station has a residual tilt of 3.1° after the earthquake, which includes the influence of the swing component) as the implementation object. Uncorrected ground motion horizontal (194 degrees) and vertical acceleration time histories such as figure 2 and image 3 shown. According to relevant data, the equivalent longitudinal wave velocity α of the soil layer at the earthquake site is 400m / s 2 ; The Poisso...

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Abstract

The invention discloses an earthquake motion rocking component acquisition method. According to the method, a principal in which the Fourier amplitude spectrum of earthquake rocking angular displacement is similar to that of the ground vertical speed is introduced to be taken as the constraint condition of threshold selection of an improved spectral ratio method to further improve and optimize thespectral ratio method. The method has the advantages that the proportion coefficient between displacement potential functions of a P wave and an SV wave are determined by using the optimized and improved spectral ratio method according to a derivative formula of an elastic wave theory, and the earthquake rocking component containing a full-frequency component is finally obtained using the derivative formula of the elastic wave theory; the advantages of two kinds of methods for acquiring the earthquake rocking components are effectively combined to overcome the detects of each method, and therefore the effective acquisition of the earthquake rocking component is achieved.

Description

[0001] technology neighborhood [0002] The invention belongs to the technical field of earthquake detection, and relates to a method for obtaining a shaking component of an earthquake, in particular to a method for obtaining a shaking component of an earthquake based on an improved spectral ratio method and elastic wave theory. Background technique [0003] When an earthquake occurs, the ground not only produces three translational components, but also three rotational components. Among the three rotation components, the rotation around the Z axis is called torsion; the rotation around the X and Y axes is called rocking, such as figure 1 shown. Due to factors such as the difficulty of measuring the time history of the rocking component of ground motion, there are no actual records of the time history of the rocking component of ground motion available for practical use. Therefore, how to determine the time history of the rocking component of ground motion is an urgent proble...

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 魏文晖袁超
Owner WUHAN UNIV OF TECH
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