Severest ground motion selection method based on Pareto multi-objective optimization

Abstract

The invention discloses a severest ground motion selection method based on Pareto multi-objective optimization. Severest ground motions are selected based on Pareto multi-objective optimization, a plurality of ground motion intensity indexes serve as targets, large sample data in a ground motion base are optimized and selected, small sample severest ground motions with larger collapsing force are selected, elastic-plastic time-history analysis cost is effectively reduced, a equivalent single-degree-of-freedom system based on anti-seismic structures is provided in a ground motion intensity index step, correlation analysis of response between IMs and the anti-seismic structures under the single-degree-of-freedom system is performed, high efficiency of selection of the ground motion intensity indexes is effectively solved, sensitive degrees of different anti-seismic structures for different ground motion indexes are considered, high-correlation IMs are comprehensively selected for the different ground motion indexes, selected high-correlation IMs vector groups serve as targets, dominance relation among different ground motions is determined by the aid of a Pareto multi-objective optimization method, and a scientific theory basis is provided for selection of the severest ground motion.

Description

technical field [0001] The invention belongs to the technical field of ground motion selection, and in particular relates to a most unfavorable ground motion selection method based on Pareto multi-objective optimization. Background technique [0002] At present, the method of elastic-plastic time-history analysis is commonly used in the seismic design of seismic structures. As the input of time-history analysis, ground motion has a crucial influence on the seismic response analysis of aseismic structures. For important seismic structures such as nuclear power plants, large dams, and some lifeline projects, in order to meet the seismic requirements of these important seismic structures, it is easiest to conduct elastoplastic time-history analysis on all ground motion records under the site where the seismic structure is located, but The cost of doing so is very high, and the amount of calculation required is so huge that it is impractical. Furthermore, it is necessary to car...

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Problems solved by technology

Another example is the most unfavorable ground motion selection method based on the skyline proposed by Professor Pan Peng of Tsinghua University, which uses a set of intensity indicators to represent the potential destructive force of earthquake motions. However, the intensity indicators used are selected based on general experience and are not related to earthquake resistance. The index of structural seismic response is highly correlated, and may even have negative correlation, which cannot effectively represent the strength of earthquake motion, and has a certain adverse effect on its subsequent optimization selection

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