dc.contributor.advisor |
Henry, R |
en |
dc.contributor.advisor |
Ingham, J |
en |
dc.contributor.author |
Corney, Samuel |
en |
dc.date.accessioned |
2018-01-21T21:14:33Z |
en |
dc.date.issued |
2018 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/36862 |
en |
dc.description.abstract |
The 2010/2011 Canterbury earthquakes in New Zealand highlighted several concerns around the seismic performance of the support connections for precast concrete flooring systems. The objective of this research was to investigate the support connection detailing for these precast concrete flooring systems that had been identified as potentially vulnerable to earthquake induced non-ductile failure modes and that had not been previously tested. To achieve this objective, the performance of precast concrete flooring systems during the Canterbury earthquakes was reviewed and the observed damage was compared with failure modes identified previously. From this review, the support connections both for deep hollow-core precast concrete floors and for rib and timber infill precast concrete floors were identified as requiring further research to support seismic design and assessment guidelines. Deep hollow-core floors were identified because of the previously identified vulnerabilities of hollow-core precast concrete floor units to earthquake induced non-ductile failure modes as well as the supposition that these vulnerabilities may be exacerbated where deep hollow-core units are used. An experimental programme was initiated to investigate the seismic performance of deep hollow-core units with support connection detailing that is recommended by the New Zealand Concrete Structures Standard (NZS 3101:2006) and that was previously developed and verified for shallower depth units. The support connections incorporating this connection detailing performed adequately and prevented undesirable damage to the precast unit. As such, the test results confirmed that the detailing recommended in NZS 3101:2006 for HC units is sufficiently robust to accommodate damage well in excess of that which would be anticipated during a design-level earthquake. Furthermore, this testing indicated that improvements in performance can be anticipated where the supported width of the unit is increased in accordance with the proposed amendment 3 to NZS 3101:2006. Previous research also indicated that rib and timber infill floors are susceptible to undesirable failure modes when subjected to earthquake deformations and damage consistent with these failure modes was observed during the Canterbury earthquakes. An experimental programme was conducted to investigate the seismic performance of rib and timber infill floor support connections consistent with those within existing structures, those within structures currently constructed, and with detailing recommended following the Canterbury earthquakes. The rib and timber infill floor support connections in existing structures were found to be susceptible to a potentially non-ductile loss of support failure and both increasing the rib seating length and connection weakening were identified as viable retrofitting techniques for precast concrete ribs susceptible to this failure mode. The rib and timber infill floor support connections recommended following the Canterbury earthquakes exhibited a markedly improved performance and were able to robustly accommodate damage well in excess of that which would be anticipated at the support during large earthquakes. Subsequently, a number of recommendations are provided for new construction based on the performed tests. In particular it is recommended that precast ribs should always be seated on top of a low-friction bearing strip, irrespective of all other support connection detailing. Additionally, it is recommended that grade 300 steel should be used as continuity reinforcement, rib stirrup cover should be minimised, and that the ends of the ribs should be armoured. |
en |
dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
PhD Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA99265057214002091 |
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 |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
en |
dc.title |
Seismic Performance of Precast Concrete Flooring Systems |
en |
dc.type |
Thesis |
en |
thesis.degree.discipline |
Civil and Environmental Engineering |
en |
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Doctoral |
en |
thesis.degree.name |
PhD |
en |
dc.rights.holder |
Copyright: The author |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/OpenAccess |
en |
pubs.elements-id |
721808 |
en |
pubs.record-created-at-source-date |
2018-01-22 |
en |
dc.identifier.wikidata |
Q112936029 |
|