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All articles published in the November 2012 issue.
(NB Technical Guidance Note Level 1, No. 18 contained within this issue was updated in October 2016. For the updated article, see the individual article entry for this issue.)
Publish Date - 26 October 2012
The development of gas fields in a highly seismic zone in the Caspian Sea required an innovative offshore platform. Arup were the detailed designers of a self-installing gravity based structure (GBS) to meet this demand – the first such platform to be commissioned in the region. Arup became involved after an elastic analysis based prescriptive design approach predicted the platform to have inadequate capacity to withstand signifiant seismic events. The Arup team adopted a performance based approach, in combination with advanced non-linear analyses, to demonstrate the suitability of the design for use in this location. Non-linear time history soil-structure interaction finie element analyses were used to demonstrate that the GBS platform satisfied the peformance requirements of ISO 19901-21. In addition, the performance based approach provided the client with an improved understanding of the likely response of the structure to a real earthquake and a greater ability to manage the risks associated with the facility.
With care, engineers can reduce the risks to those who construct, maintain, use and demolish structures. Generally, we can presume that the strength and stability
of ﬁnished structures will be assured by compliance with design codes. The greatest hazards to design out are those encountered during construction or demolition, or ones inherent in structure use.
As winter draws closer in the UK, Structural-Safety’s Alastair Soane cites several examples of recent weather-induced structural damage.
Sean Brady provides an overview of the technical and human factors that contributed to the partial collapse of Dutch football team FC Twente’s stadium roof.
Bob McKittrick provides an update on the Forum's recent activities. Notably, the crucial role it's played in two recent major developments; the UK Bribery Act which came into law on 30 June 2011, and the new BS 10500: Specification for an anti-bribery management system, which was released in December 2011.
A brief but important overview on the forthcoming changes to the way in which UK employers will need to report Pay as You Earn (PAYE) details to HM Revenue & Customs. From April 2013 there will be a new way to report PAYE in real time: Real Time Information (RTI).
One of the most common structural elements is the timber floor joist. This is normally found in residential properties, but can also be seen in medium sized commercial developments. This Technical Guidance Note will explain the principles behind the design of timber floor joists and provide a worked example. All of the advice given will be in accordance with BS EN 1995-1-1 Eurocode 5: Design of Timber Structures – Part 1-1: General – Common rules and rules for buildings.
(This article was updated in October 2016 to reflect errata issued since its original publication.)
When designing foundations for a structure there is a need to determine the bearing capacity of the soil. This applies to all forms of foundation, from a simple pad footing to a pile cap. The bearing stress capacity of the soil is the key variable that has a direct impact on the form and size of foundations. This Technical Guidance Note explains the principles of how bearing capacity of soils are determined and how it impacts on the design of foundations.
This paper presents advances in funicular tile vaulting, made possible through innovation in form finding, falsework systems and construction methods. A full-scale prototype has been realised with the application of new research in the following areas: newly developed structural design tools based on Thrust Network Analysis (TNA), which allow one to generate novel shapes for funicular (compression-only) structures; an efficient digitally fabricated cardboard falsework system, which provides accurate description of a complex reference surface in space; and adaptations of traditional tile vaulting techniques, which have introduced strategies for generating continuous tiling patterns, non-uniform vault thickening, and construction sequencing for structural stability. The methods described in this paper, as applied for the design and construction of the prototype vault, have offered new insights to the challenges of new funicular form for masonry and have paved the way for future research and applications.
Topics of importance openly discussed...