Probabilistic assessment of brittle failure modes of timber connections
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Examensarbete för masterexamen
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The growing popularity of timber as a building material fuelled by a increasing rise of both
environmental and social sustainability is pushing timber structures to new heights. Taller and
more complex timber structures are leading to higher capacity connections being required to
continuing ensuring safe, efficient, robust, and reliable timber structural designs. Connections
play an important role in the overall safety and reliability of timber structures by introducing
ductility into the structural system to counteract the inherent brittle material behaviour of
wood. Steel-timber connections are a common practical connection choice for high capacity
connection systems to maintain ductility requirements as structures increase in height. To
allow for a higher capacities, these connections are increasing not only the size of the timber
members being joined together but also increasing the size and number of fasteners. Both of
these two effects increase the likelihood of brittle failure mechanisms to occur; however, the
likelihood of brittle failure modes is still a complex function of both material and geometric
properties. The aim of this master’s thesis is to develop a better understanding of when brittle
failure mechanisms in high capacity timber connections occur to assist in the inclusion of
explicit brittle failure models in reliable and robust timber connection design methods in tall
timber structures. Simulation of material and geometric parameters of timber connections are
presented to qualitatively assess the impact on capacity of the connection and the likelihood of
brittle failure.
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timber engineering, tall-wood structures, structural connections, high capacity connections, brittle failure, probability of failure, ductile failure