Weld box section steel joint multi-scale finite element modeling method

Abstract

The invention provides a weld box section steel joint multi-scale finite element modeling method. The weld box section steel joint multi-scale finite element modeling method includes: S1, selecting an element type combination used for multi-scale modeling from ANSYS finite element software; S2, performing initial geometric modeling on weld box section steel joints; S3, guaranteeing correct directions in a spatial structure for rod pieces by adjusting direction points of all the rod pieces; S4, deleting redundant portions at intersections of the rod pieces, which run through the interiors of the rod pieces, so as to conform to characteristics of weld sections among all the rod pieces; S5, assigning solid element attributes to one third of the length of each rod piece in a complete geometric model of the steel joints, assigning beam element attributes to two thirds of the length of each rod piece in the complete geometric model of the steel joints, and dividing coarse grids and fine grids so as to obtain a multi-scale finite element model of the steel joints. The weld box section steel joint multi-scale finite element modeling method is provided according to unique advantages of the multi-scale finite element model, assists a structural health monitoring system, obtains local detail information of the weld box section steel joints, simulates structural real behavior, and guarantees structural safety.

Description

technical field [0001] The invention relates to the field of health monitoring of civil engineering structures, in particular to a multi-scale finite element modeling method for welded box-section steel nodes. Background technique [0002] In recent years, large-scale civil engineering structures are changing with each passing day, and the application of large-scale grid structures is also becoming more and more extensive. The types of joints used in grid structures usually include welded or screwed steel plate joints, welded hollow ball joints, bolted ball joints, intersecting joints and cast steel joints, etc. [0003] The finite element models are divided into two categories: single-scale finite element models and multi-scale finite element models. The traditional finite element model is usually established on a macroscopic single overall large scale. Under the action of load, the local details of the structure cannot have good induction and load performance due to the r...

AI Technical Summary

Problems solved by technology

[0004] At present, the application of structural health monitoring technology is becoming more and more widespread, but it still has the following two major defects: (1) the number of sensors used in the health monitoring system is limited, and it cannot monitor all local key parts of the structure; (2) due to the Complexity and spatial variability, the installation position of the sensor may not be the local key part of the ideal structure

Therefore, it is not enough to monitor structures during construction and operation based solely on information collected by health monitoring systems

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