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Earthquake motion assessment 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: 2022-05-17
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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  • Earthquake motion assessment method based on performance level
  • Earthquake motion assessment 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 to 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 struct...

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Abstract

The present invention relates to the technical field of seismic design. The performance-level-based seismic motion evaluation method of the present invention includes the following steps: determining the interstory displacement angle corresponding to different performance levels as the seismic performance level; mapping different performance levels to the displacement of the top of the structure, And obtain the base shear force under different performance levels; select the number of mode shapes, and obtain the vertex displacement and base shear force curves in each mode from the second mode shape to the maximum mode shape to establish a single-degree-of-freedom system according to the first cycle of the structure The second-order elastic-plastic differential dynamic time history equation repeatedly adjusts the peak acceleration of different ground motions to extract the peak acceleration of ground motion that reaches the performance level; evaluates the ground motion based on the performance level. The invention abandons the concept of intensity, and directly completes the evaluation of the performance ground motion in the design stage of the building scheme based on the performance level, overcomes the uncertainty of the intensity, greatly improves the calculation accuracy, 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 Patents(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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