Large-span steel structure index change prediction method based on finite element analysis method

Abstract

The invention discloses a large-span steel structure index change prediction method based on a finite element analysis method, and the method comprises the following steps: 100, obtaining the original index data of a large-span steel structure, and storing the original index data in an Excel table; step 200, establishing a function model according to the index data parameter range, and establishing a finite element node model by adopting large finite element software ABAQUS; step 300, importing the original index data table into the ABAQUS finite element node model, and automatically outputting node rigidity; and step 400, according to node rigidity parameters, analyzing influence weights of various factors, acquiring a data error prediction index by using a non-completely similar error prediction method, establishing an accurate node finite element model, analyzing the consistency between the model of the end plate connection node and prototype stress distribution, acquiring corresponding main influence factors, and finally establishing a node finite element model of the end plate connection node. By constructing an incompletely similar node model database, the similarity error prediction problem is layered according to specific conditions, the complexity of the model is reduced, and the prediction precision is improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of index prediction of long-span steel structures, and in particular to a method for predicting changes in indexes of long-span steel structures based on finite element analysis. Background technique [0002] The long-span steel structure has a long service life. During its use, the structure itself will produce resistance due to the impact of external environment erosion, fatigue effects, material aging, natural disasters, etc., and the actual state of the structure does not match the design, construction defects, etc. Responses such as reduction and damage accumulation, these reactions will lead to sudden engineering accidents to a certain extent. [0003] According to the stress characteristics of the long-span steel structure, it can be seen that the stability of the structure plays a controlling role. The long-span steel structure members cannot continue to bear the load after ...

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Problems solved by technology

[0007] For this reason, the embodiment of the present invention provides a method for predicting changes in indicators of large-span steel structures based on finite element analysis to solve the problem of high complexity in predicting changes in indicators of steel structures in the prior art and the lack of uniform indicators of changes in large-span steel structures The estimated value of the forecast error cannot be analyzed as a whole, and it is easy to cause a waste of resources

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