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Seismic oscillation evaluation method based on performance level

A ground motion and leveling technology, applied in geometric CAD, design optimization/simulation, sustainable transportation, etc., can solve problems such as accurate assessment, achieve scientific assessment methods, improve calculation accuracy, and overcome uncertainty in intensity

Active Publication Date: 2020-10-13
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

[0005] The technical effect of the present invention can overcome the above-mentioned defects, provide a method for evaluating earthquake motion based on performance level, and solve the problem of how to accurately evaluate earthquake motion based on performance level in the design stage of building schemes

Method used

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  • Seismic oscillation evaluation method based on performance level
  • Seismic oscillation evaluation method based on performance level
  • Seismic oscillation evaluation method based on performance level

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Embodiment Construction

[0026] The present invention takes a five-story reinforced concrete frame structure as an example to illustrate specific implementation steps.

[0027] 1. According to the provisions of China's seismic codes, determine the interstory displacement angles corresponding to different performance levels as the seismic performance level. The maximum story displacement angle of the structure can represent different performance levels of the structure. The seismic code stipulates that the maximum story displacement angle of the reinforced concrete frame structure corresponding to different performance levels is shown in Table 1.

[0028] Table 1. Performance levels

[0029]

[0030] 2. Adopt the pushover structure of the first-order mode PUSHOVER, obtain the relationship between the maximum interstory displacement angle and the displacement of the top of the structure under the first vibration mode, and map different performance levels to the displacement of the top of the structur...

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Abstract

The invention relates to the technical field of anti-seismic design, and discloses a seismic oscillation evaluation method based on performance levels, and the method comprises the following steps: determining interlayer displacement angles corresponding to different performance levels as anti-seismic performance levels; mapping different performance levels to structure vertex displacement, and acquiring base shearing force under the different performance levels; selecting a vibration mode number, obtaining vertex displacement from a second vibration mode to a maximum vibration mode under eachorder mode and a base shear curve, establishing a second-order elastic-plastic differential power time-history equation of a single-degree-of-freedom system according to a first period of the structure, repeatedly adjusting peak accelerations of different ground motions, and extracting a ground motion peak acceleration reaching a performance level; and evaluating earthquake motion based on performance levels. According to the method, the concept of intensity is abandoned, the seismic oscillation evaluation of the building scheme design stage performance is completed directly based on the performance level, the intensity uncertainty is overcome, the calculation precision is greatly improved, and the evaluation method is more scientific.

Description

technical field [0001] The invention relates to the technical field of seismic design, in particular to a method for evaluating earthquake motion. Background technique [0002] China's seismic code (GB 50011-2016) stipulates that the seismic intensities with a 50-year exceedance probability of 10%, 63% and 2% are frequent, basic and rare, respectively, and the seismic bearing capacity is based on the elastic seismic response of fortification frequent Spectrum, using mode shape decomposition method or bottom shear method to calculate seismic action, and combining seismic action effects to realize the calculation of seismic bearing capacity of components. American ASCE7, IBC is based on two-level conversion, converting 2 / 3 of the maximum considered earthquake (corresponding to the "rare intensity" in the Chinese code) to the design earthquake (corresponding to the "basic intensity" in the Chinese code), based on the design response spectrum. The bottom shear force method (equ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F30/20
CPCG06F30/13G06F30/20Y02T90/00
Inventor 刘文锋苗吉军
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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