Investigation of optimum level of development and 4 dimensionalizing of 3D bridge product models for maintenance

近年来，3D产品模型被用于桥梁的设计和施工。然而，为大量现有桥梁开发详细的3D产品模型以进行维护在经济上是不现实的。因此，在这项研究中，我们为桥梁设计了一个开发水平(LOD)计划，并测量了每个LOD制作3D产品模型的时间，并获得了成本曲线。根据好处，我们决定使用问卷调查的方式询问专业人士。此外，我们还将桥梁每个构件的评估与3D产品模型联系起来，并通过在时间轴上将维修工程与3D模型联系起来将3D模型修改为4D模型。

Recently, 3D product models are used for design and construction of bridges. However, development of detailed 3D product models for a large number of existing bridges for the purpose of maintenance is economically unrealistic. Thus, in this research, we devised a plan of levels of development (LOD) for bridges, and we measured time for making a 3D product model for each LOD and obtained a cost curve. As per the benefit, we decided to use questionnaires by asking professionals. In addition, we linked the evaluation of each member of a bridge with the 3D product model and modified the 3D model as a 4D model by linking repair works to the 3D model in a time axis.