Calculation Method of Seismic Bearing Capacity of Structural Members Based on Performance Level

Abstract

The present disclosure relates to the technical field of seismic design, and provides a method for calculating a seismic bearing capacity of a structural element based on performance levels, including: setting different performance levels based on a maximum interlayer displacement angle of a structure, and calculating top displacements of the structure at different performance levels; according to a mass participation factor of a first mode shape and the top displacements of the structure at different performance levels, determining displacements of the first mode shape; according to the displacements of the first mode shape, obtaining a displacement of an equivalent single-degree-of-freedom system; selecting a plurality of ground motions suitable for a site, obtaining a plurality of seismic influence coefficients of the first mode shape at different performance levels; based on an average peak acceleration of the plurality of ground motions at different performance levels and according to a design response spectrum specified by a seismic code, obtaining a plurality of seismic influence coefficients; synthesizing a seismic action of the structure at different performance levels under the plurality of mode shapes; and calculating the bearing capacity. The seismic bearing capacity of the structural element is calculated based on the performance levels, and thus the seismic design method is more scientific.

Description

technical field [0001] The invention relates to the technical field of seismic design, in particular to a method for calculating the seismic bearing capacity of structural components. Background technique [0002] The Chinese Seismic Code (GB 50011-2016) stipulates that the earthquake intensities with a probability of exceeding 10%, 63% and 2% in 50 years are the frequent, basic and rare, respectively, and the seismic bearing capacity is based on the elastic seismic response of the fortified frequent intensity The seismic action is calculated by the mode shape decomposition method or the bottom shear force method, and the seismic action effect is combined to realize the calculation of the seismic bearing capacity of the components. American ASCE7, IBC is based on two-level conversion, and converts 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...

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Problems solved by technology

In essence, the performance-based seismic design should calculate the seismic bearing capacity of components based on the performance level (not the intensity), but there is no method for the seismic bearing capacity design of structural components based on the performance level

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