梁式桥参数化建模专家系统

Expert System for Parametric Modeling of Beam Bridge

在桥梁养护行业,传统桥梁病害检测方式向数字化检测转型已成为该行业发展趋势,而桥梁三维可视化是实现数字化检测的基础.一般的梁式桥参数化建模程序,具有“一经写定,不易修改”的弊端,为了避免这一问题,提高参数化建模的灵活性与可扩充性,采用了一种将专家系统与梁式桥参数化建模相结合的方法,该方法结合专家系统理论知识、梁式桥结构知识和梁式桥组件及全桥参数化建模过程,设计了梁式桥快速建模专家系统.主要内容包括知识库的分类设计、知识库的数据库表设计、知识表达方式的选取、组件建模推理机制及全桥建模推理机制,以及参数化建模时部件、组件、全桥建模算法.使用该方法进行梁式桥建模结果表明,该方法能够根据用户给出的少量主要参数准确完成桥梁组件及全桥的参数化建模,用户通过修改知识库,就能改动参数化建模所依赖的结构计算知识.该方法增加了参数化建模的灵活性及可扩充性.

In the bridge maintenance industry,the transition of bridge disease detection from traditional mode to digital mode has become the development trend of the industry,and the 3D visualization of bridges is the basis of the realization of digital detection.General beam bridge parameterized modeling program has the disadvantage of“once written,it is not easy to modify”.In order to avoid such defects and improve the flexibility and extensibility of parametric modeling,a method combining expert system with parametric modeling of girder bridges is adopted.By combining expert system theory knowledge,beam bridge structure knowledge and parametric modeling process of beam bridge components and whole bridge,this method designs a rapid modeling expert system for beam bridge.The main contents of the system include the classification design of knowledge library,design of database table for knowledge library,the selection of knowledge expression,the reasoning content of component modeling and full bridge modeling,and the algorithm of component,assembly and full bridge modeling in parametric modeling.Finally,through the analysis of the modeling results,it is found that the method can accurately complete the parametric modeling of bridge components and the whole bridge according to a few main parameters given by users.By modifying the knowledge library,users can change the structural calculation knowledge that the parametric modeling process depends on.This method increases the flexibility and extensibility of parametric modeling.