Rocking Structures with Passive Energy Dissipaters : An Approach in Timber

ResearchSpace Repository

Show simple item record

dc.contributor.advisor Quenneville, P en
dc.contributor.advisor Chouw, N en Loo, Wei en 2016-03-03T20:18:08Z en 2016 en
dc.identifier.citation 2016 en
dc.identifier.uri en
dc.description.abstract Passive energy dissipaters, in the form of slip-friction connectors, are implemented in an experimental timber wall as hold-downs. Under an increasing and laterally applied force, rocking of the wall ensues when the slip-force in one or both of the connectors is obtained. The initial stages of this research focussed on developing a symmetric slipfriction connector that is both simple to fabricate and cost-effective. Previously, symmetric slip-friction connectors have relied on brass shims to enable stable sliding. However, experiments on symmetric connectors with abrasion resistant steel placed in direct contact with mild steel, reveals stable sliding with highly elastoplastic characteristics. This is provided the faying surfaces are in the clean mill scale condition (removal of mill scale and polishing of the faying surfaces is found to result in extremely erratic force-displacement behaviour). The need for brass shims, or indeed shims of any kind, is thus obviated. The new concept slip-friction connectors are implemented as hold-downs in an experimental wall of engineered lumber. The elastoplastic characteristics of the slipfriction connectors readily transfer to the wall, and a novel shear key arrangement facilitates re-centring during quasi-static reversed cyclic loading. The wall strength is readily adjusted through varying the preload in the bolts used to mobilise friction, and this preload is achieved and maintained through the use of stacked Belleville washers. The interaction of the slip-friction connectors with the shear key produces a rocking motion that is quite distinct from that of a free rocking block. An analytical procedure is developed in order to explore and describe this motion, and the influence of shear key placement on re-centring capability is clearly demonstrated. A tentative displacementbased design procedure is then proposed for multi-storey walls with slip-friction connectors, and an example structure numerically modelled. Under earthquake simulations, the example wall is found to emulate the response of an equivalent but idealised structure with a plastically deformable hinge at its base. Drifts typically remain within the intended limits, and residual displacements are small when gravity effects are considered. When compared with the response of comparable, but fully elastically responding structures, base shears and response accelerations are significantly reduced. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA99264842710602091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title Rocking Structures with Passive Energy Dissipaters : An Approach in Timber en
dc.type Thesis en Civil Engineering en The University of Auckland en Doctoral en PhD en
dc.rights.holder Copyright: The Author en
dc.rights.accessrights en
pubs.elements-id 524127 en
pubs.record-created-at-source-date 2016-03-04 en

Files in this item

Find Full text

This item appears in the following Collection(s)

Show simple item record


Search ResearchSpace

Advanced Search