Performance-based seismic design method based on three-dimensional elastic-plastic seismic response spectrum

Abstract

The invention relates to the technical field of aseismic design, and in particular to a three-dimensional elastic-plastic seismic response spectrum-based performance-based aseismic design method. According to the method, a three-dimensional elastic-plastic seismic response spectrum is established under different design intensities (ground motion parameters), and during internal force calculation,the corresponding elastic-plastic seismic response spectrum is directly investigated and surveyed on the basis of a real elastic-plastic state, so that the problem that the internal force extraction does not accord with the structural elastic-plastic state during performance-based design is solved; and for displacement, a three-dimensional elastic-plastic displacement spectrum obtained through carrying out calculation by adoption of a single-degree-of-freedom system elastic-plastic dynamic and time-historical analysis is adopted, so that the problem that the errors are large as large seism ormiddle seism displacement calculation in an aseismic code relies on experiences is solved. Obviously, when the method is used for performance-based aseismic design, the calculation methods of internalforce and displacement are more scientific and the calculation precision is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of seismic design, in particular to a performance-based seismic design method based on three-dimensional elastic-plastic seismic response spectrum. Background technique [0002] The world's advanced seismic design codes such as the Chinese Standard, the American Standard and the European Standard show that both the bottom shear method for static design and the mode shape decomposition method for dynamic design are based on the two-dimensional elastic seismic response spectrum to complete the seismic design. [0003] China's seismic code (GB 50011-2016) conducts seismic design based on seismic intensity (earthquake motion parameters). The earthquake intensities with 50-year exceedance probability of 10%, 63% and 2% are small earthquake, moderate earthquake and major earthquake intensity respectively, and fortify according to three levels: that is, small earthquakes are not damaged, moderate earthquakes can be...

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Problems solved by technology

[0005] The above facts show that, in terms of internal force, Chinese codes directly use small earthquake elastic two-dimensional spectrum for internal force calculation, while Europe and the United States convert the design spectrum into small earthquake elastic two-dimensional spectrum for internal force calculation. In terms of displacement, when the code adopts the practical engineering design method, the Chinese code uses the two-dimensional large earthquake spectrum to calculate the interstory displacement elastically, and the elastoplastic interstory displacement increase coefficient ηp is equivalent to the For interstory displacement, Europe and the United States use the two-dimensional design spectrum, which is first transformed into a small earthquake elastic two-dimensional spectrum for displacement calculation. By using the structural displacement amplification factor qe or the structural displacement amplification factor Cd, it is equivalent to the designed displacement (moderate earthquake displacement) , this equivalent experience is obvious, and the error will be large

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