Project Field D: Components
The subprojects of project field D are to aim at experimental investigations about construction members with textile reinforcement, the appraisal of the mechanical properties with help of nondestructive functional imaging method as well as the development of models for the numerical simulation of the load bearing behavior of constructions with textile reinforcement.
The experimental investigations in both subprojects D1 and D4 concentrate on columns under normal force loading and on beams under torsional stress in the 3rd stage of the Collaborative Research Centre 528. A strengthening effect for columns, especially in the load introduction zone, will be estimated. The textile reinforcement will improve the working confinement favorably insomuch that the three-axial stress state inside the construction member improves and the load bearing capacity under compressive stress increases. The load capacity of beams under torsion stress should be improved by using spiral textile reinforcement. Through the adjustment of the textile reinforcement to the load direction an effective strengthening effect would be achieved.
The algorithms will be enhanced in such a way in Subprojects D2 that important effects of the load-bearing behaviour, currently inaccessible for the numerical simulation, could be estimated. The Fuzzy Stochastic Finite Element Method (FSFEM) will be enhanced for consideration of data uncertainty of material parameters and in the bond behaviour. The Multi-reference-plane model (MRM) coupled with a meso-macro interaction model will enable a detailed bond and structure modelling. In order to take account of time-dependent loading, the FSFEM will be extended to solve the fuzzy random equation of motion. Furthermore, the MRM will be enhanced in such a way that the investigation of the global stability of textile strengthened RC structures and the analysis of laminated beams with textile reinforcement are possible. These advanced numerical models are the precondition for the reliable simulation of the load-bearing behaviour, for safety assessments close to reality and for damage prognoses.
The subprojects D3 develops and applies methods of digital photogrammetry and computer tomography for the automatic measurement of two- and three-dimensional displacement fields, deformations and surface defects such as cracks of test objects and structures during short and long time load tests.