Re-engineering im konstruktiven ingenieurbau von der bauzeichnung zum produktmodell

For the management or reorganisation of existing buildings data concerning the dimensions and construction are necessary. Often these data are given exclusively by paper-based drawings and no digital data such as a computer based product model are available. In order to perform mass calculation, damage mapping or a recalculation of the structure these drawings of the building under consideration have to be analysed manually by the engineer. This is a very time consuming job. In order to close this gap between drawings of an existing building and a digital product model an approach is presented in this paper to digitise a drawing, to build up geometric and topologic models and to recognise construction parts of the building. Finally all recognised parts are transformed into a three-dimensional geometric model which provides all necessary geometric information for the product model.