Structural vulnerability analysis method considering initial damage state under seismic sequence

An initial damage and analysis method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of poor vulnerability analysis accuracy, low calculation efficiency, etc. The effect of improving computational efficiency

Active Publication Date: 2019-10-11
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor accuracy of fragility analysis and low calculation efficiency in existing structural fragili

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  • Structural vulnerability analysis method considering initial damage state under seismic sequence
  • Structural vulnerability analysis method considering initial damage state under seismic sequence
  • Structural vulnerability analysis method considering initial damage state under seismic sequence

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specific Embodiment approach 1

[0036] Specific implementation mode one: as figure 1 As shown, a method for analyzing structural vulnerability under an earthquake sequence considering the initial damage state described in this embodiment, the method includes the following steps:

[0037] Step 1, select N ground motion sequences from PEER (Pacific Earthquake Engineering Research Center, Pacific Earthquake Engineering Research Center) and NIED (National Research Institute for Earth Science and Disaster Resilience, Japan Institute of Disaster Prevention Science and Technology) earthquake motion database;

[0038] The selected N ground motion sequences need to meet the following conditions: (1) the main shock and aftershocks are recorded at the same station, and the magnitudes of the main shock and aftershocks are both greater than 5.0; (2) the peak values ​​of the main shock and aftershocks Acceleration PGA is greater than or equal to 0.1g; (3) The site providing ground motion records is located in a free site,...

specific Embodiment approach 2

[0062] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the specific process of the step four is:

[0063] The joint earthquake demand model is composed of the marginal probability distribution function of the vertex displacement value under the main shock, the marginal probability distribution function of the vertex displacement value under the aftershocks and the mixed Copula function;

[0064] The Frechet distribution is selected to describe the marginal probability distribution of the vertex displacement value under the main shock and the marginal probability distribution of the vertex displacement value under the aftershock; Correlation of vertex displacement values ​​under aftershocks; a single type of Copula function is difficult to fully fit the correlation. In order to improve the fitting degree, a mixed Copula function is used for simulation. According to the Bayesian weighted average method an...

specific Embodiment approach 3

[0075] Embodiment 3: This embodiment differs from Embodiment 1 in that: the peak acceleration of aftershocks in each structure-earthquake sample is sequentially modulated from PGA1 to PGAn, and the amplitude of each amplitude modulation is 0.1 g.

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Abstract

The invention discloses a structural vulnerability analysis method considering an initial damage state under a seismic sequence, and belongs to the technical field of structural seismic safety assessment. According to the method, the problems of poor vulnerability analysis accuracy and low calculation efficiency of an existing structural vulnerability analysis method under multiple earthquakes aresolved. According to the method, by establishing the combined seismic demand model and the two-dimensional limit state, the influence of the initial damage state on the seismic capacity of the structure can be effectively considered in limit state overrun probability calculation, so that the accuracy of safety assessment of the structure under the seismic sequence is improved. Moreover, the method can consider various initial damage states caused by different primary earthquakes in IDA analysis at the same time, and avoids a process of simulating a specific damage state in a traditional method, so that the calculation efficiency is improved, the calculation cost is reduced, and the method is more convenient for practical application. The method can be applied to the technical field of structural anti-seismic safety assessment.

Description

technical field [0001] The invention belongs to the technical field of structure anti-seismic safety assessment, and in particular relates to a structural fragility analysis method under an earthquake sequence considering an initial damage state. Background technique [0002] During seismic events, structures are often threatened by multiple seismic actions. Earthquake disaster investigations have shown that many structures that suffered slight damage under the main shock suffered serious damage or even collapsed under the subsequent aftershocks with smaller magnitudes. This is mainly due to the degradation of the mechanical properties and material properties of the structure due to the main shock damage, which directly leads to a significant decline in the seismic capacity of the damaged structure in subsequent aftershocks. It can be seen that the initial damage state after the mainshock increases the seismic risk of the structure under the earthquake sequence. At present...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 张茂花包旭翟长海温卫平
Owner NORTHEAST FORESTRY UNIVERSITY
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