Construction Details and Observed Earthquake Performance of Unreinforced Clay Brick Masonry Cavity-walls

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• 作者：Marta Giaretton^a ; ^{marta.giaretton@dicea.unipd.it" class="auth_mail" title="E-mail the corresponding author} ; Dmytro Dizhur^b ; ^{ddiz001@aucklanduni.ac.nz" class="auth_mail" title="E-mail the corresponding author} ; Francesca da Porto^a ; ^{francesca.daporto@dicea.unipd.it" class="auth_mail" title="E-mail the corresponding author} ; Jason M. Ingham^b ; ^{j.ingham@auckland.ac.nz" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Clay brick masonry ; URM cavity-walls ; Earthquake performance ; Out-of-plane damage ; Cavity-walls performance ; New Zealand URM buildings
• 刊名：Structures
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：6
• 期：Complete
• 页码：159-169
• 全文大小：1421 K

文摘

Unreinforced masonry (URM) cavity-wall construction is a form of masonry where two leaves of clay brick masonry are separated by a continuous air cavity and are interconnected using some form of tie system. A brief historical introduction is followed by details of a survey undertaken to determine the prevalence of URM cavity-wall buildings in New Zealand. Following the 2010/2011 Canterbury earthquakes it was observed that URM cavity-walls generally suffered irreparable damage due to a lack of effective wall restraint and deficient cavity-tie connections, combined with weak mortar strength. It was found that the original cavity-ties were typically corroded due to moisture ingress, resulting in decreased lateral loadbearing capacity of the cavity-walls. Using photographic data pertaining to Christchurch URM buildings that were obtained during post-earthquake reconnaissance, 252 cavity-walls were identified and utilised to study typical construction details and seismic performance. The majority (72%, 182) of the observed damage to URM cavity-wall construction was a result of out-of-plane type wall failures. Three types of out-of-plane wall failure were recognised: (1) overturning response, (2) one-way bending, and (3) two-way bending. In-plane damage was less widely observed (28%) and commonly included diagonal shear cracking through mortar bed joints or bricks. The collected data was used to develop an overview of the most commonly-encountered construction details and to identify typical deficiencies in earthquake response that can be addressed via the selection and implementation of appropriate mitigation interventions.