Swiss standards for existing structures – Four years of implementation

Publisher： International Association for Bridge and Structural Engineering

ISSN： 2221-3783

Source： IABSE Symposium Report, Vol.103, Iss.8, 2015-02, pp. : 2-11

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Abstract

In January 2011, the Swiss Society of Engineers and Architects (SIA) implemented a series of standards for existing structures. The standard entitled ‘Existing structures – bases for examination and interventions’ specifies the principles, the terminology and the appropriate methodology for dealing with existing structures. This standard is complemented by a series of standards which treat specific items regarding ‘actions on existing structures’, ‘existing concrete, steel, composite, timber and masonry structures’ as well as ‘geotechnical and seismic aspects of existing structures’. These standards provide effective engineering methods to respond to items such as higher live loads, accidental actions or the restoration and improvement of the durability of existing structures.This paper highlights major principles and approaches, in particular those related to the stepwise procedure, updating of action effects through monitoring, updating of structural resistance and novel technologies of intervention. Methodological aspects of the main activities, that is, examination of structures and interventions to improve existing structures, are described and illustrated by two examples. Experiences from four years of implementation of the Swiss Standards for existing structures are evaluated, and assets and shortcomings are shortly highlighted.