Multi-segment natural ground motion synthesis method based on set response spectrum

Abstract

The invention relates to the technical field of civil and architectural engineering, in particular to a multi-segment natural ground motion synthesis method based on a set response spectrum. The method includes the following steps: collecting a large number of natural original ground motion records; screening out eligible seismic wave fragments through a specific method; and synthesizing the seismic wave fragments into a synthetic response spectrum closest to a target design response spectrum. The synthesis method follows the principle that the ground motion response spectrum is approximatelyconsistent with the target design response spectrum of the site. The ground motion synthesized can maintain the frequency-domain non-stationary property possessed by a natural ground motion record. The synthesis method is applicable to the anti-seismic analysis of all structure forms under the same fortification intensity and site conditions.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a method for synthesizing multi-segment natural ground motions based on a set response spectrum. Background technique [0002] The time-history analysis method is currently the most accurate seismic analysis method, and the accuracy of its analysis results largely depends on the selection of input ground motions. It is very important to choose the ground motions for time-history analysis reasonably. It is ideal if there are actual ground motion records available on the proposed site, but usually the required ground motion records are not available on the proposed site. Although the number of actual ground motions recorded in the world has increased greatly, and some typical strong motion records can be used as input ground motions, the ground motion records in my country are relatively lacking compared with other developed countries, and the site conditions of the groun...

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Problems solved by technology

Although the number of actual ground motions recorded in the world has increased greatly, and some typical strong motion records can be used as input ground motions, the ground motion records in my country are relatively lacking compared with other developed countries, and the site conditions of the ground motion records are different from those of other developed countries. The site conditions of the proposed project are very different, so that the existing ground motion records still cannot meet the requirements of seismic analysis. Therefore, in the actual engineering calculation, it is necessary to use artificially simulated ground motion to supplement

At present, artificial ground motions are synthetic ground motions simulated by computer numerical simulations. The commonly used simulation methods only consider that the response spectrum is in good agreement with the seismic code design (amplitude-frequency characteristics), while ignoring the non-stationary characteristics in the frequency domain of natural ground motions. There is a big difference between the ground motion and the actual natural ground motion record

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