1 Overall information The overall information includes general project infor

1 overall information the overall information

This preview shows page 7 - 9 out of 18 pages.

(1) Overall information The overall information includes general project infor- mation in the ER Matrix (e.g., designer, discipline code, geographical location, site type, and investigation in- formation). They can be queried from the attributes of Figure 5. A portion of an example of ER Matrix for the delivery of structural design information
Image of page 7

Subscribe to view the full document.

566 H. Lai et al. Exchange requirement-based delivery method of structural design information for collaborative design ... “Project” and “Site”. According to the IFC schema, the “Project” and “Site” are represented as IfcProject and Ifc- Site, respectively. Figure 6 presents the entities IfcProject, IfcSite, and their attributes related to the ERs in the ER Matrix. Through reference relations, overall information can be mapped into the target IFC data. For example, the OwningUser attribute, which is represented by the IfcPer- sonAndOrganization entity, can describe designer infor- mation. When design information needs to be extracted, the IfcOwnerHistory entity will be queried through the IfcProject entity. (2) Object information As a rich schema, IFC can be used to represent structural objects and their attributes defined in the ER Matrix. Ac- cording to structural elements in IFC schema, Table 3 shows the mappings between the required objects in the ER Matrix and IFC object entities. As mentioned above, the required objects were also mapped to the relevant IFC object entities in IFC4. Each object has numerous attributes for business tasks. The ER Matrix of structural design provides the required attributes in the delivery of structural design information. According to the representation methods of diverse attri- butes in IFC schema, the required attributes were mapped to IFC attributes or referenced to other IFC entities, as shown in Table 4. The object location information, for example, is mapped into the attribute ObjectPlaement of IfcProduct. In IFC schema, each IFC object entity inherits this attribute from the IfcProduct entity. In an IFC model, the IfcShapeRepresentation entity is used to represent this attribute. Thus, the IfcShapeRepresentation entity will be queried from the target IFC object entity when extracting object location information. Taking the IfcBeam entity as an example, Figure 7 illus- trates the structure of its attributes by using EXPRESS-G language. The required attributes defined in the ER Matrix are also presented in Figure 7. The attributes of IfcBeam can be divided into two types: explicit attributes and those defined by inverse attributes. The explicit attributes are Figure 6. Required attributes in the IfcProject and IfcSite entities Table 3. Definitions of required objects in the ER Matrix Required object IFC class (IFC2x3) IFC class (IFC4) Beam IfcBeam. IfcBeam, IfcBeamStandardCase.
Image of page 8
Image of page 9
  • Summer '14

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes