Numerical inversion analysis method based on structural stress monitoring result

Abstract

The invention provides a numerical inversion analysis method based on a structural stress monitoring result, and the method comprises the following steps: S1, selecting a plurality of stress monitoring points, applying a local load nearby the stress monitoring points, and carrying out the measurement and calculation to obtain the actually measured structural stress change values at the stress monitoring points; S2, selecting a structure object and establishing a finite element grid; S3, selecting an initial boundary load; S4, calculating the stress of each stress monitoring point under the initial boundary load; S5, performing parameter regression on the stress and structure stress change relational expression to obtain a preliminary numerical model of the boundary load of the structure object; and S6, checking and calibrating the preliminary numerical model to obtain a final numerical model. According to the method, the advantages of a numerical calculation method and an on-site actual measurement method are effectively exerted, and the initial stress of a measurement point is obtained, and guidance is provided for long-term monitoring of the structural stress of an ocean platform.

Description

technical field [0001] The invention relates to the field of structural stress monitoring of ships or ocean platforms, in particular to a numerical inversion analysis method based on structural stress monitoring results. Background technique [0002] Structural stress monitoring of ships or offshore platforms can obtain first-hand information on stress changes in key positions of the platform, which plays an important role in analyzing the safe operation status of offshore platforms. The initial stress at the position of the platform measuring point is very critical for evaluating the node stress safety during the operation of the platform. However, due to the low survival rate of the strain gauges applied to the plate during ship construction, the plate will bear local loads after the ship is built, making it difficult to accurately obtain the initial stress at key nodes. [0003] In conventional numerical analysis and calculation, the overall deformation of the offshore p...

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Problems solved by technology

However, there are two drawbacks in this treatment: 1) the finite element calculation workload of the overall modeling of the structure is very large; 2) the structural shape of the structure changes gradually under the influence of construction welding, sun exposure, night dew, and time aging, resulting in irreversible damage. plastic deformation

Due to the existence of the above two defects, if accurate local boundary conditions need to be obtained, it is not advisable to simply use numerical calculations to obtain the initial stress at the node

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