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 20 No. 1 2007

 

Title
Material Strains And Relevance To Seismic Design Vol.20 No.1 2007
Author/s

Richard Fenwick, Rajesh P Dhakal
Abstract

With the seismic provisions in the Loadings Standard, NZS 4203:1992, being replaced by NZS 1170.5:2004 (Structural Design Actions - Earthquake Actions), a number of changes have been made to seismic design in New Zealand. The most significant of these is the requirement that the level of detailing used in potential plastic regions (nominally ductile, limited ductile or ductile) be determined on the basis of the predicted magnitudes of deformation they are required to sustain in the ultimate limit state. Previously the level of detailing was determined principally on the basis of the structural ductility factor. However, it is shown that the structural ductility factor does not give a reliable guide to the deformation sustained in an individual plastic region. This paper outlines the background to the change in the way that the level of detailing is determined and it discusses how predicted inelastic deformation demands can be found in the design of concrete structures.
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Title
Using Disasters as a Learning Tool in Higher Education Vol 20 No 1 2007
Author/s

Alan Jennings, Pauliie Mackinnon
Abstract

(Reprinted from IStructE's - The Structural Engineer Volume 84 No. 15) This report was written by Alan Jennings DSc, CEng, FIStructE, MICE, FZMA Professor Emeritus, Queen's University Belfast, prior to his death on 21 September 2005, and Pauline Mackinnon BSc, PhD, CEng, MICE, Senior Lecture,: QUB. Since the first 'Learning from Disasters' exercises were conducted at Queen's University Belfast in 1994 and also at the University of Glasgow in 1997, much has been learnt not only by the students but also by the organisers about disasters and how to maximise the learning experience. This report discusses how the exercises have progressed and also how awareness of disasters could improve the preparation of students for study topics and, at a later date, a life in industry.
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Title
Material Strain Limits For Seismic Design Of Concrete Structures Vol.20 No.1 2007
Author/s

Richard Fenwick and Rajesh P Dhakal
Abstract

The design of structures to resist seismic actions to New Zealand Standards requires the level of detailing used in potential plastic regions to be based on the predicted material strain levels that they sustain in the ultimate limit state. For potential plastic hinges in reinforced concrete sections, curvatures are used rather than strains in reinforcement or concrete. This substitution is made as it is difficult to calculate realistic reinforcement and concrete strains in plastic hinges subjected to cyclic loading. Test results from 37 beams, 25 columns and 36 walls were examined. From each of these the maximum nominal curvature sustained when the lateral force reduced to 80 percent of the theoretical strength was found. From the results of the tests, design curvature limits for plastic hinges have been developed. These limits will be submitted to Standards with the proposal that they are incorporated in an amendment to the Structural Concrete Standard NZS 3101:2006. They have a more rational basis than the existing curvature limits in the Standard and they are easier to use in design.
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Title
A Concrete Beam Design Program to be available to Members on the SESOC Website Vol 20 No 1 2007
Author/s

Esli J Forrest
Abstract

The Society together with the Cement and Concrete Association of New Zealand (CCANZ) has sponsored the development of a concrete beam design program to be made available to members, free of charge, on the website in the same way and under the same conditions as the Soils program.
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Title
Articles for Discussion IPENZ Structural Task Force SESOC Committee Update Vol 20 No 1 2007
Author/s

SESOC Committee
Abstract

The John Scarry open letter to IPENZ in late 2002 raised concerns about the standard of structural engineering in New Zealand. Within a year of John’s letter an IPENZ Structural Engineering Taskforce recommended several changes for the industry. SESOC was represented on that Taskforce group by our then president, Dr Barry Davidson. Approximately three years have passed since the publication of the IPENZ “Report of the Structural Engineering Taskforce Enquiring into the State of Practice in Structural Engineering in New Zealand”. The SESOC Management Committee felt it would be worthwhile at this time to summarise the current status, as we see it, of the issues raised in the Taskforce report.
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Title
Project Corner Reinforcement Corrosion And Its Remediation With A Case Study Of Cathodic Protection Of Pre-stressed Beams Vol 20 No 1 2007
Author/s

Dr Mohammad Ali, Peter Wiles
Abstract

(Reprinted from IStructE’s The Structural Engineer Volume 84 No. 23) The deterioration of reinforced and pre-stressed concrete structures, resulting from corrosion of steel reinforcement, is a worldwide problem. The extent of the problem is evident by the size of the concrete repair market, which is now well established, with a multitude of materials and systems for reinstatement of the corrosion damaged structures. Equally, the attention given to this subject by international practitioner and researcher communities and the enormous number of publications on the subject demonstrates both the problem size and the desire to achieve long-term solutions.
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Title
Learning Experiences (Contributions From Members) Vol 20 No 1 2007
Author/s

Various
Abstract

Sometimes we experience learning the hard way. We build our knowledge with experiences that go as expected and well, and we also learn from some experiences that did not go so well. From these less pleasant experiences, we tell ourselves “we won’t do that again”. We need to share those experiences so we can all learn and move forward. We hope to make this section a regular feature where you can share your less pleasant experiences so that we all may learn from them.
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