Multi- damping ratio goal response spectrum compatible artificial earthquake wave synthesis method

Abstract

The invention relates to an artificial seismic wave synthetic method compatible with a multi-damping ratio response spectrum. By adoption of the method, a traditional method is first adopted to generate initial artificial seismic waves and then a time domain adjustment algorithm is adopted to be performed on all periodical control points in turn; an optimization algorithm is adopted to perform fractional step adjustment in a given periodical control point according to the damping ratio number of a target response spectrum so as to realize a minimum root-mean-square error between a multi-damping ratio response spectrum value on the periodical control point of the artificial seismic waves after adjustment and a target multi-damping ratio response spectrum value. The time domain adjustment algorithm is to overlay amplitude modulation simple harmonic time paths on the initial artificial seismic waves, and the amplitude modulation simple harmonic time paths adopt intensity envelope curves which are the same with the initial artificial seismic waves for modulation of the simple harmonic time paths. The algorithm is high in fitting precision and high in calculating speed and is suitable for promotion and application.

Description

technical field [0001] The invention relates to a synthesis method of artificial acceleration time history (hereinafter referred to as artificial seismic wave) compatible with multi-damping ratio response spectrum. The proposed multi-damping ratio response spectrum compatible artificial seismic wave synthesis method can be applied to site earthquakes for important engineering projects Synthetic artificial seismic waves and seismic design of major projects in safety assessment. Background technique [0002] Simultaneously fitting artificial seismic wave synthesis with multiple damping ratio response spectra is one of the important tasks in seismic safety evaluation. For important engineering structures, nonlinear dynamic time-history analysis under ground motion excitation is required in the seismic design. The nonlinear Including the nonlinear elements introduced by the use of shock-absorbing and isolating devices, and the elastic-plastic behavior of the structure under larg...

AI Technical Summary

Problems solved by technology

This method has higher fitting accuracy than the traditional frequency domain adjustment method, but because it involves the inversion of the narrow-band time history, each inversion requires a Fourier transform and an inverse Fourier transform, which takes a long time to calculate

In addition, the length of the time history obtained by the inversion of the narrow-band process is the same as the length of the artificial seismic wave to be adjusted, so it has a greater impact on other control period points, which also reduces the iterative efficiency of the method

Images