This process is an iterative redesign for an agreed upon solution To ensure a

This process is an iterative redesign for an agreed

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This process is an iterative redesign for an agreed-upon solution. To ensure a more effective way to develop their own models, designers need to manually extract required objects and attributes from other models, which is time- consuming and error-prone. The proposed method was applied to this project, because no IDM/MVD related to the delivery of structural design information was released. Following the procedure in Figure 3(a), the following steps elaborate the delivery of structural design information for collaboration in this project. 1. After the structural type was defined in the concep- tual design, the structural engineer received the ex- change model A_ER.1-S_ER.1 from the architect for Figure 12. An example of the deployment of the Er2StruIfc module
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572 H. Lai et al. Exchange requirement-based delivery method of structural design information for collaborative design ... preliminary structural design. The A_ER.1-S_ER.1 was automatically extracted from the architectural model A_ER.1. According to the ER Matrix of pre- liminary structural design (Figure 5), the structural model S_ER.1 was built with beams, columns, piles foundations, slabs, and shear walls. 2. The model S_ER.1 was imported into the delivery tool for generating the exchange models for other designers. According to the user-defined ER Ma- trix, the required exchange models such as S_ER.1- A_ER.2 and S_ER.1-M_ER.2 were generated and delivered for collaborative design. The exchange model S_ER.1-A_ER.2, for example, was made up of beams, columns, slabs, shear walls, and their required attributes, as shown in Figure 13. The re- quired objects and their attributes comply with the ERs defined in Figure 5. 3. According to the PM of structural design in Fig- ure 3, before building the model S_ER.2, exchange models from other disciplines needed to be import- ed along with the special equipment. In this library building, the load of bookshelves full of books is one of crucial structural load information for structural design, so the specific information was delivered to structural engineers. Subsequently, the structur- al model S_ER.2 was built in detail. As shown in Figure 5, the reinforcements were added into each structural object of the S_ER.2 compared with the S_ER.1. In addition, more information and details for representation of the objects were also required in the S_ER.2 according to the ER Matrix. 4. After fulfillment of the S_ER.2 in detailed design, the model S-BIM.Co was generated from the S_ ER.2 according to the defined matrix (as shown in Figure 5). In this project, the S-BIM.Co was used for BIM collaboration with multiple disciplines, and some conflicts and disagreements were found. As a result, the requests for design changes were submit- ted to related designers.
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