{"id":2522,"date":"2020-01-28T09:09:18","date_gmt":"2020-01-28T09:09:18","guid":{"rendered":"http:\/\/141.23.68.248\/wp\/?page_id=2522"},"modified":"2021-01-25T10:09:51","modified_gmt":"2021-01-25T10:09:51","slug":"composite-girder","status":"publish","type":"page","link":"http:\/\/141.23.68.248\/wp\/?page_id=2522","title":{"rendered":"Composite Girder"},"content":{"rendered":"

Creating an Ontology<\/h2>\n

While a composite girder can be seen as both, a bridge and a structural building element, the calculation model will be the same. That is why an ontology was generated, which can be used to describe the structural element as well as the bridge. In order to be able to distinguish between the two cases, the ontology contains nonloadbearing elements, which are unique for a building, such as flooring, or a bridge, such as rails or caps. The loadbearing elements will be part of both cases.<\/p>\n

\"compositegirder\"<\/a><\/p>\n

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High Performance Criteria (hpc)<\/h2>\n

A composite girder describes a girder, which combines both positive aspects of two commonly in construction used materials: The bending moment generates a tensile stress in the steel beam and a compression stress in the concrete slab. In order to be able to correctly calculate stresses at any point of the girder, the forces need to be distributed over the two materials. The ration of the Young’s modulus of steel (~210.000N\/mm\u00b2) to the Young’s modulus of concrete (~31.000 N\/mm\u00b2) is about 7. When loading the beam with a bending moment, this ratio results in a shift of the stresses in both components.
\nWhen creating the geometry of such girder, the line where it needs to be alligned to, will be generated automatically.\u00a0Yet, a structural engineer will need further information in order to start a structural analysis. One crucial information is the moment of inertia, which is calculated according to the input geometry. During the method of calculation of the moment of inertia, the centroid line of the cross-section is calculated as well. With these two parameters, the structural analysis can be done.<\/p>\n

For construction management reasons, it can be necessary to mesh the steel part of the girder into several parts and deliver it to the construction site where it is welded together. The lengths of these parts often depends on the size of the vehicle, they are delivered with.<\/p>\n

Therefore, the following hpc were chosen for the implementation in DynamoBIM:<\/p>\n