A multi-scale finite element modeling method for welded box-section steel joints

Abstract

The invention provides a multi-scale finite element modeling method for welded box-section steel nodes, including: S1, selecting unit type combinations for multi-scale modeling in ANSYS finite element software; S2, for welding box-section steel nodes Carry out preliminary geometric modeling; S3. Ensure that the direction of the rods in the space structure is correct by adjusting the direction points of each member; S4. Delete the redundant parts where the intersections of the rods penetrate each other inside the rods to meet the requirements of each rod The characteristics of the welded section between the joints; S5. Assign solid element attributes to the 1 / 3 length of each member in the complete geometric model of the node, and assign the beam element attribute to the 2 / 3 length, and perform rough mesh and fine mesh division to obtain multi-scale nodes Finite element model; the present invention combines the unique advantages of the multi-scale finite element model, proposes a multi-scale finite element modeling method for welded box-section steel nodes, assists the structural health monitoring system, obtains local detail information of welded box-section nodes, and simulates structures Authentic behavior to ensure 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

Images