A Method of Generating 2D Layout Drawings from 3D Bridge Models Using Catia Software

Abstract

The invention discloses a method for using CATIA software to generate a two-dimensional layout diagram of a three-dimensional bridge model; the steps are as follows: receive design road data in the CATIA software, and establish a three-dimensional model of the bridge; then, all key design information is obtained from the CATIA software The parameter form and the design form are stored in the 3D model space; the user-defined feature UDF in the CATIA software is used to make the 2D graphic template; in the 3D model space where the 3D bridge model is located, a vertical surface corresponding to the center line of the road is generated The corresponding vertical unfolded surface, the horizontal unfolded surface parallel to the geoid, and several vertical planes passing through the span line are generated; then the corresponding information is projected to generate the layout diagram of each surface of the bridge in the traditional two-dimensional drawing. The invention can effectively transmit the information in the three-dimensional graphics to the two-dimensional graphics, realizing data synchronization and model linkage.

Description

technical field [0001] The invention relates to the technical field of computer-aided design, in particular to a method for generating a two-dimensional layout drawing from a three-dimensional bridge model by using CATIA software. Background technique [0002] CATIA software is usually used for three-dimensional modeling in the field of mechanical engineering, and is rarely used for making two-dimensional drawings. Moreover, most of the drawings produced in the field of mechanical engineering are detailed drawings of components and general assembly drawings, and the graphics area is usually a rectangle or a rectangle with an aspect ratio of no more than 2:1. Elevation General Arrangement)" or "Front Plan General Arrangement" is a drawing in which the length direction of the figure is much larger than the width direction (the aspect ratio is greater than 2:1). [0003] Therefore, bridge designers can only refer to the existing CATIA drawing methods to make bridge component d...

AI Technical Summary

Problems solved by technology

Moreover, most of the drawings produced in the field of mechanical engineering are detailed drawings of components and general assembly drawings, and the graphics area is usually a rectangle or a rectangle with an aspect ratio of no more than 2:1. Elevation General Arrangement)" or "Front Plan General Arrangement" is a drawing in which the length direction of the figure is much larger than the width direction (the aspect ratio is greater than 2:1)

[0003] Therefore, bridge designers can only refer to the existing CATIA drawing methods to make bridge component drawings and partial large-scale drawings, but they cannot solve the problem of converting the overall model of the bridge with a large aspect ratio established in CATIA software from "3D graphics" to " Publishing Issues of Drawings in Two-dimensional Graphics

In addition, the direct projection bridge model also has the problem of overlapping structural lines, which is difficult to handle for 2D maps

[0004] The existence of the above problems hinders the application of CATIA software in the field of bridge engineering. Therefore, it is necessary to propose a method that can provide complete design information for the production of two-dimensional graphics on the premise of ensuring the integrity of the overall model of the bridge.

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