Through the proposed method for the delivery of structural design information

Through the proposed method for the delivery of

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Through the proposed method for the delivery of structural design information, structural engineers in this project easily understood which information was included in the structural models, and which information should be delivered to other designers. The deliverables from struc- tural models which completely satisfied the ER Matrix of this project were automatically generated without manual data processing. Taking the S_ER.1-A_ER.2 and the S- BIM_Co as examples, the accuracy and efficiency of the delivery of structural design information in collaborative design are further analyzed in the following section. According to the ER Matrix in Figure 5, the S_ER.1- A_ER.2 and the S-BIM_Co were extracted from the S_ ER.1 and the S_ER.2, respectively. By using the IFC File Analyzer (National Institute of Standards and Technology, 2011), the numbers of the extracted objects were listed in Table 5. The results show that the numbers of required objects in the S_ER.1-A_ER.2 and the S-BIM_Co were correct, and the objects with the “Empty” symbol were not found in the S_ER.1 and the S_ER.2. By defining ERs in the proposed matrix, only required structural objects were extracted from the original structural models, which showed the accuracy of the proposed delivery method. Moreover, the proposed method enhanced the efficien- cy of data interoperability between structural engineers and other designers. Figure 14 presents file sizes of some structural models in this project. The S_ER.1-A_ER.2 extracted from S_ER.1 had a 39.35% reduction in the physical file size, and the de- creasing rate of S-BIM_Co reached 92.17%. According to the ER Matrix in Figure 5, the S_ER.2 of this project had numerous reinforcements within each structural object. Unlike the regular structural objects, the geometric shapes of the reinforcements were represented by numerous IFC instances, resulting in an obvious increase in IFC file size. In the S_ER.2, the reinforcement was represented by the IfcReinforcingBar entity, the geometry of which was rep- resented by IfcSweptDiskSolid with many composite curve segments (represented by IfcCompositeCurveSegment Figure 13. Information exchange requirements from structure to architecture
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Journal of Civil Engineering and Management, 2019, 25(6): 559–575 573 entity). However, the reinforcement was not required in BIM collaboration. As shown in Figure 5, the option of the reinforcement in S-BIM_Co was “Empty”. Through the proposed delivery tool, numerous reinforcements were automatically filtered, and a lightweight model S-BIM_Co was generated based on the S_ER.2. After the filtration process, S-BIM_Co had such a large decreasing in the file size. In contrast, the S_ER.1-A_ER.2 had almost the same structural objects as those in the S_ER.1, except for the foundation. Consequently, the S_ER.1-A_ER.2 had a smaller decrease in the file size than the S-BIM_Co did.
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