Simulation method of high-acceleration seismic spectrum

A high-acceleration, simulation method technology, applied in the field of high-acceleration seismic spectrum simulation, can solve problems such as unusable, small low-frequency displacement, etc., and achieve the effect of improving site adaptability

Inactive Publication Date: 2020-03-31
CHINA NUCLEAR POWER ENG CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, it is impossible to use the existing domestic hydraulic seismic station to simulate the high-acceleration seismic response spectrum using the method of multi-frequency wave artificial acceleration time-history test.
Although the electromagnetic vibrating table can achieve very high acceleration at high frequencies, the low-frequency displacement is very small, so it is also impossible to use the existing domestic electromagnetic vibrating table to use the method of multi-frequency wave artificial acceleration time-history test to simulate high-acceleration earthquake requirements. spectrum

Method used

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  • Simulation method of high-acceleration seismic spectrum

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Effect test

Embodiment 1

[0021] Both the hydraulic seismic table and the electromagnetic vibrating table adopt the method of single-frequency wave for seismic tests, among which the OBE test adopts the single-frequency sinusoidal sweep wave method or the sinusoidal beat-wave method, and the SSE test adopts the single-frequency sinusoidal beat-wave method. In the S1 curve, the sine sweep test is carried out on the hydraulic seismic table below the turning frequency f1, and the sine sweep test is carried out on the electromagnetic shaking table above f1; Perform a sine beat test. Select the appropriate frequency interval and the acceleration at each frequency point to make the test response spectrum envelope figure 1 The two harsh required response spectra shown solve the current situation that the required response spectrum cannot be enveloped above about 8 Hz only by hydraulic table test, and the required response spectrum cannot be enveloped below about 8 Hz by only electromagnetic shaking table test...

Embodiment 2

[0024] Both the hydraulic seismic table and the electromagnetic vibration table adopt the single-frequency sinusoidal beat wave method to carry out the seismic test. The number of cycles in each beat of the designed sinusoidal beat wave is not limited to the usual 5-10 cycles per beat, and can be increased according to the need for magnification. The number of cycles in a beat makes the test response spectrum envelope figure 1 The 2 bars shown require a response spectrum.

[0025] Select appropriate frequency intervals in sections within the entire frequency range of the seismic test. Below the upper limit frequency of seismic disturbance (generally considered to be 33Hz), a larger frequency interval is used, such as 1 / 3 octave, and a smaller frequency interval is used above. , such as 1 / 6 octave.

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Abstract

The invention discloses a simulation method of a high-acceleration seismic spectrum. According to the method, the whole frequency range of an anti-seismic test is segmented according to the capacitiesof a hydraulic seismic station and an electromagnetic vibration station, the hydraulic seismic station with good low-frequency performance is adopted for a low-frequency anti-seismic test, the electromagnetic vibration table with good high-frequency performance is adopted for a high-frequency anti-seismic test higher than a turning frequency, and meanwhile it is ensured that a test response spectrum envelops a required response spectrum. According to the simulation method provided by the invention, the test stands with different principles are adopted in different frequency bands, the advantages of the test stands in a specific frequency band can be exerted, and the high-level earthquake resistance of the equipment can be verified on the existing hydraulic seismic stations and electromagnetic vibration stations in China, so that the plant site adaptability and safety of the equipment are improved.

Description

technical field [0001] The invention belongs to the technical field of equipment seismic identification, and in particular relates to a simulation method of high-acceleration seismic spectrum. Background technique [0002] Earthquakes are a very common natural phenomenon. There are more than 5 million earthquakes in the world every year, and the earthquakes that can really cause serious harm to human beings average 10 to 20 times a year. Seismic disturbances have the potential to damage redundant components simultaneously. This feature of earthquake damage makes the concept of multiplicity, diversity criterion and defense in depth meaningless in design. In short, earthquakes may cause common cause failure of equipment, so we must pay attention to seismic identification in design and construction. [0003] Industries such as electric power, construction and national defense are paying more and more attention to the impact of earthquake external events on the safety and rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
CPCG01M7/022
Inventor 李玉荣范遂李昌磊
Owner CHINA NUCLEAR POWER ENG CO LTD
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