Fracture surface pre-processing method for variable cross-section beam finite element model

Abstract

The invention provides a fracture surface pre-processing method for a variable cross-section beam finite element model, and solves a problem cross section matching in variable cross-section beam modeling. The method comprises two steps of fracture surface auxiliary mesh generation and automatic cross section matching. The main process comprises: first, segmenting in advance to form cross section blocks and automatically generating nodes and units, segmentation of the cross section blocks being completed by manpower, when the fracture surface of a variable cross-section beam is processed, region segmentation of each pair of cross sections having a similar structure; adjusting size of the cross sections and matching the units and the nodes in the cross section according to a minimum distance principle; after node matching is completed, according to the unit and node number of a reference cross section, numbering the units and nodes of a target cross section again, and finally obtaining a pair of matched cross sections. A method for determining whether segment is intersected is also provided, and line segment intersection point coordinates can be calculated. The method can be suitable to be used for various types of cross section forms in practical engineering, and can simplify modeling flow and prevent modeling mistakes.

Description

technical field [0001] The invention relates to a method for assisting grid division and section matching of variable-section beam sections, and is an auxiliary method for structural finite element modeling. Background technique [0002] Concrete structures are widely used in various bridge structures. In order to adapt to changes in the internal force of the structure and reduce the self-weight of the structure, and at the same time consider the convenience of construction, the section of the concrete main beam is usually designed as a variable section in the length direction, that is, the total height of the beam, the total width or the thickness of the plate changes gradually along the beam axis, and at the same time The overall shape of the section remains similar. In the structural finite element model, the section characteristics of variable section beams are generally approximated by a group of sections with gradually changing sizes, and the element stiffness matrix ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the section matching problem in the modeling of variable cross-section beams aiming at the method of section segmentation unit and matching cross-section in variable cross-section beam modeling

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