In English

Parametric modelling and FE analysis of architectural FRP modules

Hanna Isabella Närhi
Göteborg : Chalmers tekniska högskola, 2019. 180 s.
[Examensarbete på avancerad nivå]

Despite low weight and high strength and stiffness, Fibre Reinforced Polymers, FRP, are seldom used in building construction. This could be due to complexity in dimensioning and manufacturing, as well as lack of building design codes and standards for FRP. The University of Stuttgart has developed an analysis and manufacturing method for FRP in architectural contexts. This is the basis for a research project at Knippers Helbig GmbH, where a new type of FRP module is developed for upcoming building projects. The analysis method developed at The university of Stuttgart is however not applicable for this FRP module, and demands are also stricter since the modules will be used in building design. In this master’s thesis a new analysis method is developed. For analysis SOFiSTiK was required, which imposed limitations, thus simplifications were necessary. The module material is mainly uni-directional, with mechanically coupled node zones. Due to the thickness of the module cross sections, it was assumed that coupling effects could be neglected and that the material behaviour will be transversely isotropic. It was also assumed that beam elements could be used in analysis due to mainly uni-axial load transfer. To verify the assumptions, case studies were carried out in MATLAB and SOFiSTiK with Classical Lamination Theory as a basis. Two parametric FE models were created using SOFiSTiK QUAD and beam elements. The results were compared using parametric tools developed for this study. There was a correspondence between the results obtained in the MATLAB and SOFiSTiK analyses, as well as between the QUAD and beam models, except for in the case of torsion and shear where internal stresses were within a similar range, but displacements were not. Here it was concluded that verification by mechanical tests are required. The models were applied to variations of a full scale module, with similar results. The performance of the beam models were significantly better, and it was concluded that the QUAD model could not be used in large scale models due to long computational times. Due to similarities in internal stresses and forces the beam model should be safe-sided and accurate enough for preliminary design, assuming that the models can be verified against mechanical tests.

Nyckelord: FRP, CFRP, carbon fibre, FEA, parametric design, structural design, structural analysis, computational mechanics, finite element method, architecture

Publikationen registrerades 2019-02-19. Den ändrades senast 2019-02-19

CPL ID: 256508

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