Representation and management of digital building models with multiple detailing levels

Project: Research

Project Details

Description

The design and engineering of buildings follows an iterative process which is based on continuous refinement starting from a rough conceptual design and ending in highly detailed information for erecting the building on-site. During this process, design decisions are taken in order to add the corresponding construction details. In today’s drawing-based design procedure, this process is reflected by the different scales of the construction drawings, which feature a diverging degree of detailing and abstraction. In the drawings, geometric simplifications are applied to reflect the maturity of the design and the progress of its elaboration. However, for model-based planning processes (aka Building Information Modeling), there are currently no profound approaches available for suitably supporting the work with multiple levels of detail / levels of development (LOD). In particular, there are neither possibilities for the formal definition of a level of detail nor for the explicit description of the vagueness of the geometric and semantic information involved. For implementing the concept of detailing-sensitive simulation as targeted by the research unit as a whole, this is, however, of upmost importance. The objective of Subproject 1 is therefore the development of a multi-LOD data model which allows to explicitly define LODs, represent a concrete building on multiple LODs and describe the detailing relationships among the entities of the different LODs, which opens the possibility to check the consistency of the multi-LOD model. For defining the LODs the vagueness of the provided information will be explicitly described. The methodological approach followed is based on the extension of an available building product model by entities for explicitly describing the LODs incorporating definitions regarding geometric detailing and the provision of alphanumeric attributes. For describing the vagueness of alphanumeric attributes, they are associated with vagueness measures using different vagueness modelling approaches. For describing geometric vagueness, vagueness measures are applied to quantitative position and dimension information and additionally combined with qualitative position relationships in order to reflect the design intentions. For describing cross-LOD detailing relationships, formal methods of graph theory are applied. In order to reflect the variety of possible detailing relationships, both hierarchic as well as heterarchic relationships are considered and provided by the multi-LOD data model. Based on the corresponding graph representation, methods for checking the cross-LOD consistency are developed. In this regard, the emphasis is put on checking the consistency of the geometric representations among the different LODs.

StatusActive
Effective start/end date1/01/16 → …

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