Talks and Poster Presentations (with Proceedings-Entry):
C. Schmitt, H.-B. Neuner, B. Kromoser:
"Geodetic Surface Based Methods For Structural Analysis During Construction Phase";
Talk: 4th Joint International Symposium on Deformation Monitoring (JISDM),
- 2019-05-29; in: "4th Joint International Symposium on Deformation Monitoring (JISDM)",
V. Gikas (ed.);
Surfaced based inspection measurements are one of the main issues in engineering geodesy. During a new construction process of a pneumatic formed hardened concrete shell, surfaced based measurements and analysing procedures are realised. The concrete shell is built as a dome and further prepared as a deer pass bridge over a two-track rail. As learning structure a 1:2 model was built where the construction process, the measurement and analyse concept could be tested. The result of surface based measurements are scanned 3D point clouds performed inside of the dome. They provide the possibility of modelling a freeform surface for structural analysis and the analysis of the deviations between the actual cloud and the CAD model. The analysis concept includes the geometric surface approximation as well as the surface and the point based deformation analysis of the actual geometry during different construction steps.
Designing the construction was part of the Institute for Structural Engineering, while the surface based geometric monitoring is realised by the Research Group Engineering Geodesy, both at the TU Wien. The project is advertised and managed by the ÖBB-Infrastructure AG.
This paper focuses on the requirements of the structural analysis for the measurements and their approximation process.
In the modelling part, the point cloud is approximated by estimating the control points of a B-Spline surface in a least squares adjustment.
First the project is described. In the second chapter the engineering geodesy part is accomplished with the measurement concept, the coordinate system definition and the B-Spline surface approximation. The third chapter complete the paper with the analysis process during the construction phase under considerations of the requirements of the Finite Element Model (FEM). The paper will close with the conclusion and future tasks.
Modelling point cloud; freeform approximation; structural analysis; finite element model; shell structure
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.