A Substructure-Based Structural Response Acquisition Method and Sensitivity Acquisition Method

Abstract

The invention discloses a structural response acquiring method based on substructures and a sensitivity acquiring method. The structural response acquiring method includes: dividing an overall structural finite element model into independent substructure models unrelated to one another; acquiring the main mode of each independent substructure model, building an overall structural dynamics vibration equation according to the main modality, equivalent residual quantity and load in a time domain range, and acquiring the structural response of the overall structure according to the overall structural dynamics vibration equation. The structural response acquiring method and the sensitivity acquiring method have the advantages that the dynamics vibration equation and response sensitivity equation of the overall structure are represented by a small number of low-order modes, and the contribution of high-order modes are compensated by one equivalent residual quantity; due to the fact that thedimension of the equations is equal to the number of the reserved low-order modes, and the dimension of the equations is reduced greatly; accordingly, the provided substructure method can efficientlyand precisely calculate structural response and the sensitivity thereof.

Description

technical field [0001] The invention belongs to the technical field of civil engineering large-scale structure detection, and more specifically relates to a substructure-based structural response acquisition method and a sensitivity acquisition method thereof. Background technique [0002] Structural response and its sensitivity are widely used in the fields of model correction, parameter identification and damage detection in the time domain. For example, in response-sensitivity-based model modification, the objective function consists of the weighted difference between the measured response and the numerically simulated response. The design parameters are continuously iteratively optimized to minimize the objective function. During this process, the response sensitivity of the design parameters provides a search direction for the optimization. However, for large structures, calculating the response and response sensitivity of the structure usually consumes a lot of comput...

AI Technical Summary

Problems solved by technology

However, for large structures, calculating the response and response sensitivity of the structure usually requires a lot of computer memory and computing time

Although the traditional substructure method can improve the efficiency of calculating the response and response sensitivity, its improvement still cannot meet the engineering needs.

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