复杂钢桁拱桥全参数化建模方法

Research on Full Parametric Modeling Method of Complex Steel Truss Arch Bridge

钢桁拱桥结构形式复杂、节点类型众多的特点,给传统参数化建模工作带来了极大的困扰。复杂钢桁拱桥梁的建模一直是BIM模型中难题。结合模型全参数化概念,从数据层、逻辑层、模型层三个层面依次建立模型,针对桥梁特点,详细论述全参数化模型建模过程,即采用“B-Rep法”完成构件型建立,通过“R+GH+TS”协同设计平台完成构件体合模,完成数据与模型的结合,提高了全桥模型精度,解决了后期修模困难的问题,并结合江汉七桥项目实现了模型更高精度的实际应用,为同类桥梁的全参数化建模提供参考。

Due to the complex structure form and numerous node types of steel truss arch bridge,the traditional parametric modeling work has been greatly troubled.The modeling of complex steel truss arch bridge has always been a difficult challenge in BIM modeling.Based on the concept of model full parameterization,this paper built the model from three levels:data layer,logic layer and model layer.According to the characteristics of the bridge,the full parametric modeling process was discussed in detail.By using"B-Rep"method the component model was established in this paper.Through the"R+GH+TS"collaborative design platform,the components were assembled and data and model are combined,which improved the precision of the whole bridge model,solved the problem of the late repair die hard.Together with Jianghan No.Seven bridge project higher precision of practical application was achieved,which provided reference for the parametric modeling of similar bridges.