BIM-based structural dynamic analysis using higher-order volumetric finite elements

Building Information Modeling allows to automate the generation of simulation models and thus forms an important basis for saving time and costs as well as for increasing the quality in the planning of buildings. The type of the simulation model is largely dependent on the specific problem to resolve. For vibration analyses of solid timber constructions, a mechanically correct representation of the junctions between the components is essential. For this purpose, models consisting of hexahedral finite elements are much better suited than shell elements. With available mesh generators, however, matching hexahedral meshes can only be created automatically in case of specific building geometries and show a large number of elements at joints, which can lead to a high computational effort. Therefore, an alternative procedure to derive a hexahedral Finite Element Model from a Buiding Information Model (BIM) is presented. Therein, the building components defined in the BIM are meshed individually and their connections to each other are modelled by means of the mortar method. A great computational efficiency is gained by using higher order shape functions in combination with a relatively coarse mesh. After the description of the procedure, its applicability is demonstrated in case of a multi-storey timber building.