SESOC

Journals Abstracts

These are short abstracts of the material printed in our journal which is published twice annually. The Journal covers items of interest to structural engineers, including but not limited to: technical papers, project reports, materials information, code reviews.

Journal: Vol 23 No. 2 2010

 

Title
World Conference On Timber Engineering 2010, 20-24 June, Riva Del Garda, Trentino, Italy Vol 23 No 2 2010
Author/s

Hugh Morris
Abstract

The World Conference on Timber Engineering was held in Riva Del Garda a town on the edge of beautiful lake Lago de Garda nestled among the mountains in Northern Italy. The conference had a total of 652 delegates and 70 partners from 43 countries with 8% of the delegates from New Zealand and Australia. The New Zealand group presented 18 high quality papers and 5 posters. We were particularly well represented by the Structural Timber Innovation Company (STIC) group and this has significantly raised the profile of New Zealand timber engineering internationally.
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Title
Suggested Changes To NZS 3101:2006 with Amendments 1 and 2 Vol 23 No 2 2010
Author/s

Richard Fenwick, Dene Cook
Abstract

NZS 3101:2006 Concrete Structures Standard is a design code published by Standards New Zealand. Since the publication of the second amendment to NZS 3101:2006 a number of questions about specific clauses in the standard have been sent to Standards New Zealand and members of the Standards committee. The authors have sighted these questions and believe that a number of changes should be considered to correct errors, simplify interpretation of clauses and prevent unintended consequences or clashes with other clauses. The suggested changes, which are detailed below, are made by the authors and they have not been considered by Standards New Zealand or the NZS 3101 Standards Committee.
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Title
Department Of Building And Housing Response To The Paper “Suggested Changes To NZS 3101_2006 With Amendments 1 And 2” Vol 23 No 2 2010
Author/s

Mike Stannard - Department Of Building And Housing
Abstract

This response comments on the paper by Richard Fenwick and Dene Cook entitled “Suggested Changes to NZS 3101:2006 with Amendments 1 and 2. I understand that the purpose of the paper was to elicit comments relating to the on-going development of the Concrete Design Standard. I know there has been concern expressed about the lack of a forum to discuss such issues and, to this end, the new SESOC forum for NZS 3101 at http://www.sesoc.org.nz/discussion_forum is a welcome initiative and its use is to be encouraged. It is important to understand that the suggestions put forward by Richard Fenwick and Dene Cook are only suggestions.
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Title
Sesoc Practice Guideline - Independent Review Of Structural Designs For Building Consent Vol 23 No 2 2010
Author/s

Ashley Smith, Derek Bradley, Bill Vautier
Abstract

The objective of this SESOC Practice Guideline is to provide a framework for independent third party review of structural designs submitted for building consent. The target audience of this document is professional engineers who are involved in the practise of structural engineering design and design review. It is not intended to be prescriptive, or to be used by others as a basis for prescribing the required scope for structural design reviews. However, it will provide useful background material to others including clients, regulators and building officials. It is hoped that this Guideline will lead to a simpler, safer, more reliable and more consistent approach being taken by structural engineering designers and design reviewers across New Zealand.
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Title
Earthquake Reconnaissance – Forensic Engineering On An Urban Scale Vol 23 No 2 2010
Author/s

Michael C Griffith, Jason M Ingham, Richard Weller
Abstract

On 30 September 2009 a Richter magnitude 7.6 earthquake occurred approximately 50 km offshore from the Indonesian city of Padang on the west coast of Sumatra. As part of an AusAID initiative, the authors spent eight days conducting detailed structural assessments of damage to school buildings and medical/hospital buildings in the greater Padang region under the jurisdiction of the Australia – Indonesia Facility for Disaster Reduction (AIFDR). Approximately 300 school and 100 medical buildings were assessed during this time. The procedure used for this ‘forensic engineering’ task on an urban scale, rather than individual building scale, is described. From the data collected, the authors were able to identify common structural defects as well as deduce systemic deficiencies in the overall design and construction process for the Padang region, with a summary of these observations presented.
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Title
Earthquake-Damaged Unreinforced Masonry Building Tested In-Situ Vol 23 No 2 2010
Author/s

Dmytro Dizhur, Hossein Derakhshan, Ronald Lumantarna, Jason Ingham
Abstract

In December 2007 a magnitude 6.8 earthquake had an epicentre located approximately 50 km from the city of Gisborne, New Zealand. This earthquake caused damage to a number of buildings in Gisborne, and in particular, to numerous unreinforced masonry buildings. One such building was damaged to the extent that significant post-earthquake repairs were necessary, and partial removal of two of the building’s gable ended walls was required. This reconstruction provided an opportunity for a team of researchers from the University of Auckland to conduct field tests on the building, allowing comparison with companion testing that had previously been undertaken in a laboratory setting. This field testing involved the extraction of clay brick and mortar samples, in-situ bed joint shear tests, diagonal shear tests on samples extracted from the gabled walls, an in-situ in-plane shear test and out-of-plane testing of a gable ended wall both in the as-built condition and after the installation of a near-surface mounted (NSM) carbon fibre reinforced polymer (CFRP) retrofit solution. Testing confirmed that the boundary conditions in real buildings can significantly affect experimental response, with vertical restraint resulting in a large increase in out-of-plane load capacity, and also confirmed that the near-surface mounted FRP solution is an excellent low invasive option for seismic strengthening of unreinforced masonry walls. Details of the history of the building, and the methods used to undertake the field testing are reported, and experimental results are presented.
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Title
Out-Of Plane Strengthening Of Unreinforced Masonry Walls Using Near Surface Mounted Fibre Reinforced Polymer Strips Vol 23 No 2 2010
Author/s

Dmytro Dizhur, Hossein Derakhshan, Ronald Lumantarna, Michael Griffith, Jason Ingham
Abstract

The development of cost effective minimally-invasive seismic retrofit techniques is required for clay brick unreinforced masonry (URM) buildings because of their recognised poor seismic performance. A laboratory-based experimental study with well defined but artificial boundary conditions, which utilises constituent construction materials that replicate the material properties of masonry found in historic URM buildings, is currently addressing this need. The purpose of this study is to investigate the performance of near-surface mounted (NSM) carbon fibre reinforced polymer (CFRP) strips as a seismic retrofit solution for out-of-plane lateral loading of the walls in URM buildings. In addition, five retrofitted URM walls located in four different buildings were tested in-situ by applying out of plane loading, to complement the laboratory-based study. Testing confirmed that the NSM CFRP retrofit technique is an excellent minimally-invasive and cost effective option for seismic strengthening of URM buildings. Provisional details of the design methodology for the NSM CFRP retrofit technique, and laboratory and in-situ test results are reported. Two recent projects that implemented the NSM CFRP technique are also briefly presented.
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