Method for determining decline rate of bearing capacity of ocean platform crane

Abstract

The invention discloses a method for determining the decline rate of the bearing capacity of an ocean platform crane. The method comprises the following steps of building a structural performance database and a geometric section parameter database which form an ocean platform crane main body, and taking the initial design of a tested ocean platform crane as a basis, establishing an integral finite element model of the crane structure and a multi-scale model of the local structure of the crane, performing correlation analysis on the test model and the finite element model through a modal test of the crane structure and a water bag bearing test of the crane structure, and calibrating the integral finite element model of the crane structure and the multi-scale model of the local structure of the crane, eliminating the modeling error of the finite element model of the overall structure of the crane and the modeling error of the multi-scale model of the local structure of the crane, combining the calibrated crane overall structure finite element model with the crane local structure multi-scale model to form a test crane finite element multi-scale reference model, and through finite element static force and modal calculation and analysis of the reference model, acquiring the reduction rate of the bearing capacity of the crane.

Description

Technical field: [0001] The invention relates to a method applied on an ocean platform to measure the decline rate of the bearing capacity of a crane. Background technique: [0002] At present, the calculation of the bearing capacity of the offshore platform crane is obtained by measuring the thickness of each rod of the crane, and substituting the measured wall thickness value into the initial finite element model of the crane for numerical calculation. This method does not consider the installation conditions and the process of use. Rod corrosion and structural damage due to marine environment and other factors. In addition, due to different environmental loads and differences in installation and use norms of offshore platform cranes, each crane has a single characteristic, resulting in changes in the active cranes compared with the initial finite element model. The measured wall thickness is substituted into the initial model for calculation, which lacks scientificity an...

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Problems solved by technology

[0002] At present, the calculation of the bearing capacity of the offshore platform crane is obtained by measuring the thickness of each rod of the crane, and substituting the measured wall thickness value into the initial finite element model of the crane for numerical calculation. This method does not consider the installation conditions and the process of use. Rod corrosion and structural damage due to factors such as the marine environment

In addition, due to different environmental loads and differences in installation and use norms of offshore platform cranes, each crane has a single characteristic, resulting in changes in the active cranes compared with the initial finite element model. The measured wall thickness is substituted into the initial model for calculation, which lacks scientificity and accuracy

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