Structural dynamic parameter identification method assisted by rPCK proxy model

Abstract

The invention provides a structure dynamic parameter identification method assisted by an rPCK proxy model, and belongs to the field of structure engineering. Comprising the following steps: establishing a finite element model capable of roughly reflecting a to-be-analyzed structural system; establishing a dynamic parameter space sample set; establishing a structural system response space sample set driven by the dynamic parameter space sample set by adopting probabilistic finite element analysis; establishing a robust polynomial chaos-Kriging (rPCK) proxy model capable of mapping the dynamic parameter space sample set to a structural system response space sample set; and driving the rPCK proxy model according to the actually measured structure system response, performing structure dynamic parameter identification by adopting Bayesian inference, and taking a Bayesian posteriori estimation mean value as a structure dynamic parameter estimation value. The method provided by the invention breaks through the limitation that an existing deterministic parameter identification method is difficult to accurately identify the dynamic parameters of the structure, and creates conditions for establishing a high-fidelity finite element model of an engineering actual structure system.

Description

technical field [0001] The invention belongs to the field of structural engineering, in particular to a method for identifying dynamic parameters of a structure assisted by an rPCK proxy model. Background technique [0002] my country's water conservancy and hydropower industry has been developing vigorously for decades, and the number of dams has exceeded 40% of the world's total. Many dams built in the early stage are gradually aging, and the extra-high arch dams newly built in the past ten years are mostly built in the strong earthquake belt of high mountains and narrow valleys in the southwest region due to their unique functions. one of the main problems. At present, the seismic safety analysis of dams usually adopts the finite element method, and the dynamic parameters of the dam-building materials are the main factors affecting the results of the finite element analysis. In engineering, the laboratory test method is usually used to determine the dynamic parameters of...

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Problems solved by technology

[0003] Most of the existing dam parameter identification methods are deterministic back-analysis based on static monitoring data such as displacement of multiple measuring points. This method not only ignores the inherent random characteristics of materials, but also the displacement of multiple measuring points can only reflect the Local static properties, it is difficult to characterize the overall space-time mechanical properties of the dam structure

In addition, the calculation cost of the established finite element model that can roughly reflect the behavior of the structural system to be analyzed is usually extremely expensive, especially when performing high-order modal analysis and transient analysis, the existing dam parameter identification methods are stretched

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