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Seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method

A ground motion and index technology, applied in seismic signal processing and other directions, can solve the problems of large error, no ground motion amplitude modulation index and amplitude modulation coefficient method, etc., and achieve the effect of simple application

Active Publication Date: 2016-03-02
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the large error introduced by the quantitative assessment of earthquake amplitude modulation in the existing earthquake engineering field has not yet proposed a method that can quantitatively assess the amplitude modulation index and amplitude modulation coefficient of earthquake motion, and proposes an earthquake motion Amplitude Modulation Index and Evaluating Method of Amplitude Modulation Coefficient

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  • Seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method
  • Seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method
  • Seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method

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specific Embodiment approach 1

[0022] Specific implementation mode one: combine figure 1 Describe this embodiment, a kind of earthquake amplitude modulation index and amplitude modulation coefficient evaluation method of this embodiment, specifically prepare according to the following steps:

[0023] Step 1. Determine the dynamic characteristics of the inelastic SDOF structure. The dynamic characteristics of the inelastic SDOF structure include period, damping ratio, hysteretic characteristics and strength, and SDOF is a single degree of freedom;

[0024] Step 2. Select 8 ground motion parameters as the amplitude modulation index, which are peak ground acceleration (PGA), peak ground velocity (PGV), peak ground displacement (PGD), Arias intensity (I A ), Park-Ang characteristic strength (I C ), Housner intensity (d rms ), spectral acceleration (S a ) and Housner spectral intensity (S I );

[0025] Step 3. Using the dynamic characteristics of the inelastic SDOF structure determined in step 1 and the 8 a...

specific Embodiment approach 2

[0028] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the non-elastic SDOF structural characteristics are determined in the step 1, and the non-elastic SDOF structural characteristics include period, damping ratio, hysteretic characteristics and strength; the specific process is:

[0029] The period of the inelastic SDOF structure ranges from 0.1 to 6.0s, and the period interval is 0.1s. Assuming that the damping ratio of the inelastic SDOF structure is 5%, the ideal elastoplastic (EPP) model is used to simulate the hysteretic characteristics of the inelastic SDOF structure. The lateral strength of the elastic SDOF structure is measured by the strength reduction coefficient R, the definition of R is shown in formula (1), and the value of R is set to 2, 4, 6;

[0030] The formula for calculating the strength reduction factor R is:

[0031] R = F e ...

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in said step three, the non-elastic SDOF structure dynamic characteristics determined in step one and the eight amplitude modulation indicators selected in step two are adopted, and the ground motion without amplitude modulation is adopted. Record and calculate the correlation coefficient between the structural response and the amplitude modulation index; the specific process is:

[0035] The process of calculating structural response using unmodulated ground motion records is as follows:

[0036] Select 364 ground motion records, and calculate the maximum displacement response value and hysteretic energy consumption response value of the inelastic SDOF structure under the unmodulated ground motion according to the dynamic characteristics of the inelastic SDOF structure determined in step 1:

[0037] m v ·· ...

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Abstract

The invention relates to a seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method. The objective of the invention is to solve the defect of large introduced errors in quantitative evaluation of seismic oscillation amplitude modulation in the earthquake engineering field in the prior art. An amplitude modulation index and amplitude modulation coefficient evaluation method which is capable of quantitatively evaluating seismic oscillation does not exist in the prior art. The seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method of the invention has the following steps that: step one, inelastic SDOF structure dynamic characteristics are determined; step two, eight seismic oscillation parameters are selected as amplitude modulation indexes; step three, unmodulated seismic oscillation records are adopted to calculate a correlation coefficient between structural reaction and the amplitude modulation indexes through utilizing the inelastic SDOF structure dynamic characteristics determined in the step one and the eight seismic oscillation parameters which are obtained in step two; step four, modulated seismic oscillation records are adopted to calculate a correlation coefficient between the structural reaction and the amplitude modulation indexes through utilizing the inelastic SDOF structure dynamic characteristics determined in the step one and the eight seismic oscillation parameters which are obtained in step two; and step five, the ratio of the correlation coefficient obtained in the step four and the correlation coefficient obtained in the step three is calculated, and the more the ratio approaches to 1.0, the smaller errors introduced by seismic oscillation amplitude modulation are. The seismic oscillation amplitude modulation index and amplitude modulation coefficient evaluation method of the invention is applied to the earthquake engineering field.

Description

technical field [0001] The invention relates to an evaluation method of an earthquake amplitude modulation index and an amplitude modulation coefficient. Background technique [0002] With the maturity of structural analysis software and the rapid development of computer computing speed, the nonlinear dynamic response analysis of structures has gradually developed into a major research method in earthquake engineering. When analyzing the nonlinear dynamic time history of the structure, it is necessary to select the appropriate amplitude modulation index and amplitude modulation coefficient to adjust the amplitude of the ground motion to the seismic hazard level of the site where the structure is located, which involves the problem of ground motion amplitude modulation. [0003] So far, the general practice of earthquake amplitude modulation is to first select a certain earthquake motion parameter as the amplitude modulation index, and then multiply (or divide) the earthquake...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 翟长海温卫平籍多发李爽谢礼立
Owner HARBIN INST OF TECH
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