Browsing by Author "Jalonen, Jarno"
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Insinööritieteiden ja arkkitehtuurin tiedekunta | Bachelor's thesis(2009) Jalonen, Jarno - Kotelopalkin ja betonitäytteisen teräspilarin välisen liitoksen kiertymiskapasiteetti
School of Engineering | Master's thesis(2013) Jalonen, JarnoThe aim of this research was to determine the rotational capacity and robustness of the most commonly used connection between a concrete filled steel column and a WQ-beam in Finland. Because of the demands of progressive collapse design, it was necessary to determine the ways in which elastically designed joint behaves in the plastic zone. The ultimate load of the joint acquired from the FEM-analysis was 1,08 - 1,88 times higher compared to the design values of the resistance by the ultimate limit design by Euro code. The design value of the rotational capacity of the joint was so high that the connection probably belonged to the highest ductility class (DCH, ductility class high) according to the Euro code (EN 1998-1). The other results acquired from the analysis also referred to a very ductile behavior of the connections steel parts. The strains developed very high before the collapse, and the yielding advanced from one structural part to another, which implied that loads transferred to other structural parts to carry after the yielding. However, the composite column behaved quite fragile. By strengthening the column the ultimate load of the joint would have been greater than the acquired values. The ductile behavior of the joint means that the joint can well be used in the highest consequence class buildings or in the areas with earthquake activity. The connection is very durable against deformations and does not collapse suddenly. Even though this beam-column connection behaved ductile with the given boundary connections, it is also necessary to examine the effects of the hollow core slabs on the stiffness of the beam.