Steel-to-concrete connections in narrow concrete corners

University essay from Lunds universitet/Avdelningen för Konstruktionsteknik

Abstract: A commonly occurring problem when designing steel-to-concrete connections in corners with space deficits is the necessity for irregularly placed bolts with regards to design codes. The complexity of the calculations for the irregular placements of bolts generates the need to use simplified models during the design. This simplification could lead to differences between the design and the physical product, resulting in uncertainties regarding the connection's strength. The purpose of this thesis is to enhance the understanding of the effects on strength and the modes of failure for the connection due to the simplified models used and investigate whether the geometrical changes could be accounted for in design. The study was performed using numerical analysis to simulate the real life behaviour of two models subjected to relevant load effects. The models were constructed in the finite element software Abaqus and validated as well as calibrated against laboratory tests performed at Luleå Technical University in 2013. The extent of the study was limited to a single case of simplified design with no regards to concrete reinforcement and tested in isolation from the entirety of the structure by the use of boundary conditions. Results show the existence of a reduction in capacity for the irregular shaped connection compared to the design model and changes to the associated failure mode. However, further studies and parametrization is needed to find conclusive evidence that the found relations are relevant for the general case and could be used for future design.

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