| Bridge engineering is an extremely important branch field in the construction field.With the frenzy of building informationization in recent years,BIM software also plays an important role in the entire life cycle of bridge engineering.However,there are still some problems in BIM modeling in some cases.During the design and construction of the new bridge,the modeling work is too much and the efficiency is low.During the operation,maintenance and maintenance of old bridges,it is difficult to establish bridge models that lack drawings,dimensions and construction materials.General BIM functions cannot fully meet the specific needs of the project,and secondary development has become a rigid demand in the industry.This paper explores the field of bridge engineering BIM modeling,using parametric modeling method to create prefabricated models of bridge components.When modeling for different bridge types and bridge appearances,it is completed by calling the prefabricated model of bridge components and modifying its characteristic parameters.Adaptation to the current bridge.Further carry out secondary development of Revit,establish a friendly interactive interface,create a bridge rapid modeling program,and complete the automatic lapping of parametric bridge components in 3D space through the study of the geometric topological relationship of each component model.This paper will use the characteristic appearance information of the bridge obtained by oblique photography technology,combined with the created parametric family library of bridge components and the rapid modeling program,to complete the rapid establishment of the BIM model of the real bridge.It provides a method for modeling difficult bridges and improves modeling efficiency.The specific research work has the following aspects:(1)Researched the principle and framework of the secondary development,selected Revit as the core software for this development,explored the key technology of oblique photography,and restored the real bridge through joint adjustment of image area network,acquisition of dense 3D point cloud,surface mesh reconstruction and texture mapping 3D model,explore the principle of feature modeling,and apply it to the parametric modeling of bridge engineering.The family and parameterization characteristics of Revit are described in detail,and the family properties can be automatically adjusted according to the changes of parameters by using its characteristics,so as to realize the flexibility and reusability of the family.For the Revit model of bridge engineering,the 3D model of each bridge component is drawn through the family template,and its appearance size is parametrically controlled.(2)Explore the family and parametric features of Revit,use its features,so that the family properties can be automatically adjusted according to the changes of parameters,and realize the flexibility and reusability of the family.Create a bridge component parametric family library for bridge engineering,draw the 3D model of each bridge component through the family template,and perform parametric control on its appearance size.(3)Based on UAV oblique photogrammetry and ContextCapture software,the actual bridge models of the third approach bridge of Tuojiang Simei Bridge and Qijiang Chengbei Bridge were restored.Most of the bridge appearance feature information was measured by using Context Capture software,and the appearance parameters were modified by calling the prefabricated model.Partial model establishment of the approach bridge of the Simei Bridge.(4)Based on the secondary development of Revit in the field of bridge engineering,the development method is studied by using the functions of Revit API.Establish the UIRibbon interactive interface,create the WPF parameter dialog box,and write the external command program to achieve the purpose of quickly generating the corresponding component model after inputting the component appearance information.Further set the reference point and reference line for each component of the bridge when the parameters change,and construct the spatial position parameters of each component in space by writing a program to complete the rapid and automatic lapping of simply supported beam bridges.(5)The research of this paper is verified by the arch bridge.Combining the established parametric family library of bridge components,the limited appearance information obtained by oblique photography technology,and the rapid modeling program of Revit secondary development,the rapid modeling of the 3D BIM model of Qijiang Chengbei Bridge was completed. |
